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 Select Plastic resources metabolism in China based on material flow analysis LUAN Xiaoyu, LIU Wei, CUI Zhaojie, LIU Yeye, CHEN Yuedong, LU Sheng, WANG Yubiao Resources Science    2020, 42 (2): 372-382.   DOI: 10.18402/resci.2020.02.15 Abstract （577）   HTML （177）    PDF （9605KB）（753）       With the rapid growth of the production and consumption of plastics, the waste and pollution of plastics become increasingly more serious. It is important to study the metabolic process of plastic resources to save the resources and protect the environment. Based on the material flow analysis method, a material flow analysis dynamic model of plastics was constructed in this study to analyze the life-cycle metabolic process of plastics from production, use, to waste from 1949 to 2018 in China. The flows and stocks of PE, PP, PS, PVC, ABS, PET and other plastic in 11 application areas were calculated, and the key points of resources waste of different kinds of plastics were analyzed. The results show that: (1) From 1949 to 2018, the consumption of plastics was 2205.6 million tons, and the output of waste plastics was 1404.8 million tons, of which 30.0% was recycled, 14.0% was incinerated, 36.0% was into landfill, and 20.0% was directly lost into the environment without treatment; (2) The in-use stocks of plastics were 630.0 million tons, and the loss stocks of plastics were 870.2 million tons, of which 66.7% were in landfill and 33.3% were carelessly discarded in the environment; (3) In 2018, the consumption of plastics was 193.1 million tons, and the output of waste plastics was 140.5 million tons, of which 32.0% was recycled, 26.0% was incinerated, 35.4% was into landfill, and 6.6% was directly lost into the environment. The study found that: The scale of plastic metabolism was large in China, and disposable plastic products had a great influence on plastic metabolism. Waste plastic was the key point of the resource loss, so the recycling of waste plastics was necessary. It was important to control the pollution of waste plastics that had entered the environment. Therefore in the future, research should focus on the risk and pollution mechanism of plastic waste scattered in the environment and improving the utilization efficiency of recycling and reusing of plastic waste, so as to reduce the loss of plastic resources and decrease the environmental pollution.
 Select Eco-environmental impact and spatial control of mineral resources exploitation in the Yellow River Basin MA Li, TIAN Huazheng, KANG Lei Resources Science    2020, 42 (1): 137-149.   DOI: 10.18402/resci.2020.01.14 Abstract （1119）   HTML （309）    PDF （12850KB）（611）       The Yellow River Basin is also known as China’s energy basin. Rational and orderly exploitation of mineral resources and overall coordination of the relationship between mineral resources exploitation and ecological environment protection are of great practical significance for the sustainable development of energy and mineral resources and ecological protection in the region. Taking the Yellow River Basin as the study area, this study comprehensively analyzed the characteristics and spatial distribution of environmental stress of regional mineral resources exploitation using multi-indicator comprehensive evaluation method, stress coupling analysis method, and GIS spatial analysis from the perspectives of ecological background fragility, spatial stress to important ecological function areas, and the degree of stress to important ecological environment factors. The 46 mining cities in the Yellow River Basin were divided into eight types, including background stress areas, ecological function stress areas, development stress areas, background with development stress areas, development with ecological function stress areas, background with ecological function stress areas, comprehensive stress areas, and no stress areas. Finally, the article put forward the control path of mineral resources development areas in the Yellow River Basin in view of ecological environment protection, including: (1) Spatial management and control by strictly restricting large-scale and high-intensity industrialization and urbanization development, especially controlling the development boundary of mining areas. (2) Intensity control for areas with fragile ecological background, the intensity and the overall development scale should be controlled simultaneously. (3) Development mode control to pay attention to the structural adjustment and upgrading of energy and mining industries. It is necessary to focus on spatially concentrated development of mining in places where mining is suitable, of industry where industrial development is suitable, and of cities and towns where urban development is suitable. Cited: CSCD(4)
 Select Changes of climate and land cover in the middle and lower reaches of the Yellow River over the past 2000 years ZHENG Jingyun, WEN Yanjun, FANG Xiuqi Resources Science    2020, 42 (1): 3-19.   DOI: 10.18402/resci.2020.01.01 Abstract （1026）   HTML （303）    PDF （8514KB）（512）       Based on the research on the changes of climate, disasters, vegetation, and land use in the past 40 years, this study made a comprehensive assessment of the characteristics of changes of temperature, dry/wet conditions, and extreme droughts and floods, and the general trend of land cover caused by the agricultural land use, in the middle and lower reaches of the Yellow River over the past two millennia. We also discussed the general relationships between the above changes and the sedimentation, breaches, and avulsions in the lower Yellow River from a historical perspective. The main conclusions are as follows. (1) During the past two millennia, multi-scale periodic fluctuations of temperature and dry/wet conditions were significant in the middle and lower reaches of the Yellow River, but the dry/wet changes in the middle and the lower reaches were not completely synchronized. Frequencies of extreme droughts and floods varied in different time periods. (2) As early as in the late Western Han Dynasty, the middle and lower reaches of the Yellow River had already been developed into an agricultural area with a spatial range similar to today’s, where, especially on relative flat terrains, only limited natural vegetation remained. Since then, the intensity of reclamation showed an increasing trend in general, although it fluctuated greatly over time. (3) The changes of climate and land cover had influenced the water-sediment balance, channel sedimentation, and riverbed stability in the middle and lower reaches of the Yellow River, and driven, as an important trigger, the repeated diking-sedimentation-suspended river-burst and avulsion cycle in the lower Yellow River during the historical period. These understandings can provide historical backgrounds for further revealing the characteristics of environmental change in the middle and lower reaches of the Yellow River and their impacts on the security of the lower Yellow River region. Cited: CSCD(1)
 Select High-quality development level and its spatiotemporal changes in the Yellow River Basin XU Hui, SHI Nuo, WU Lingling, ZHANG Dawei Resources Science    2020, 42 (1): 115-126.   DOI: 10.18402/resci.2020.01.12 Abstract （1335）   HTML （206）    PDF （4213KB）（465）       To promote the high-quality development of the Yellow River Basin, it is necessary to construct an evaluation index system for a scientific assessment of such development. Based on the two areas of economic and social development and ecological security, and considering five dimensions of economic development, innovation, improvement of people’s livelihood, environmental conditions, and ecological conditions, this study constructed a high-quality development evaluation index system for the Yellow River Basin. Using the data of nine provinces (autonomous regions) in the Yellow River Basin during 2008-2017, the entropy weight method was used in calculation. The results are as follows: The high-quality development level of the Yellow River Basin basically showed the spatial distribution of “high on both sides and low in the central area,” but the gap was decreasing year by year; The high-quality development level in each province (autonomous region) remained stable in 2008-2010, and continued to grow in 2011-2017, with a high growth rate in 2016; The overall high-quality development level of the basin showed an upward trend, with small fluctuations during 2008-2010 and a significantly increase from 2011. Over the last decade, all five dimensions improved. Accordingly, the study put forward specific suggestions and the directions for further research: (1) Strengthen regional linkages and expand the overall opening-up level of the Yellow River Basin. (2) On the basis of protecting the ecological environment, the provinces (autonomous regions) in western China should develop characteristic industries, combining with their factor endowments. (3) Shandong and Henan Provinces should strengthen the protection of the ecological environment while developing the economy. Shanxi and Gansu Provinces should improve people’s living standards urgently. Qinghai Province and Inner Mongolia Autonomous Region need to increase investments in innovation and improve innovation capacity. Finally,the study proposed the further research directions. Cited: CSCD(6)
 Select Spatiotemporal change and driving factors of comprehensive energy efficiency in the Yellow River Basin GUAN Wei, XU Shuting, GUO Xiuyao Resources Science    2020, 42 (1): 150-158.   DOI: 10.18402/resci.2020.01.15 Abstract （756）   HTML （278）    PDF （3986KB）（389）       The Yellow River Basin is an important energy base in China. The comprehensive energy efficiency of the Yellow River basin directly affects the ecological protection and high-quality development of the region. Using the super efficiency slack based measure (SBM) model to measure the comprehensive energy efficiency of nine provinces (autonomous regions) in the Yellow River Basin from 1997 to 2017, the nuclear density estimation method was selected to analyze the temporal and spatial change characteristics of comprehensive energy efficiency, and the driving factors of comprehensive energy efficiency were analyzed with the help of the geographical detector. The results show that: (1) From 1997 to 2017, the comprehensive energy efficiency of the Yellow River Basin showed a U-shaped trend of high-low-high. The comprehensive energy efficiency of the Yellow River Basin decreased from 1997 to 2003, decreased in 2009 after rapid growth from 2004 to 2010, and increased in 2015 after continuous decline from 2011 to 2017. (2) Spatially, the comprehensive energy efficiency of the western provinces of the Yellow River Basin is relatively low, and the comprehensive energy efficiency of the central provinces is greatly affected by multiple factors, while the comprehensive energy efficiency of the eastern province Shandong is significantly higher. The comprehensive energy efficiencies of the eastern, central, and western provinces and the upper, middle, and lower reaches of the Yellow River Basin have all changed from spatially unbalanced to balanced. (3) With regard to the driving factors, the explanation power of factors is in the order of financial decentralization, urbanization level, human capital level, and the degree of opening to the outside world. Expansion of local financial expenditure, acceleration of urbanization, upgrading of talent structure, and improvement of opening-up in the Yellow River Basin jointly drive the improvement of comprehensive energy efficiency. Give full play to the comparative advantages of the Yellow River Basin, and strengthen collaboration within the basin under various policies for promoting the ecological protection and high-quality development of the Yellow River Basin. Cited: CSCD(4)
 Select Dynamics and sustainability of social-ecological systems in the Loess Plateau WANG Shuai, FU Bojie, WU Xutong, WANG Yaping Resources Science    2020, 42 (1): 96-103.   DOI: 10.18402/resci.2020.01.10 Abstract （652）   HTML （180）    PDF （2056KB）（352）       Driven by global environmental changes and human activities, the dynamic changes of social systems and ecological systems are increasing. Revealing the interaction mechanisms of this coupled system is the scientific basis for maintaining and enhancing resilience and sustainability. The Loess Plateau (LP) is one of the regions under great pressure from population, resources, and environment in China. It is also an important water and sediment source area of the Yellow River. Rational land use and the coordination of soil and water conservation with water resources use and sediment control are the main requirements of watershed management and regional sustainable development in the lower reaches of the Yellow River Basin. Based on the frontier research of coupled social-ecological system (SES) and the national needs for sustainable development and ecological construction, feedback mechanisms for regional social and ecological systems and coupled SES simulation are the key issues of research. Social-ecological system research in the Loess Plateau needs to illustrate the dynamics and mechanisms of SES evolution, develop methods for analyzing system dynamics and identifying regime shifts, and develop land-use optimization models for sustainable development in the LP, which are useful for the development of theories of SES and practices of sustainable development of the Loess Plateau. Cited: CSCD(2)
 Select Spatial distribution and dynamic change of water use efficiency in the Yellow River Basin LIU Huajun, QIAO Liecheng, SUN Shuhui Resources Science    2020, 42 (1): 57-68.   DOI: 10.18402/resci.2020.01.06 Abstract （902）   HTML （211）    PDF （6532KB）（334）       Improving water use efficiency is the key measure to realize the sustainable development of water resources. It is of great significance to explore the spatial pattern and dynamic change of water use efficiency in order to promote the ecological protection and high-quality development of the Yellow River Basin. In this study, we built a global Minimum Distance to Strong Efficient Frontier (MinDS model) based on unexpected output to accurately measure the water use efficiency of the Yellow River Basin from 2000 to 2017. The spatial pattern of water use efficiency of the Yellow River Basin was comprehensively depicted from the perspective of national, regional, and intraregional comparisons. The change of distribution dynamics of water use efficiency was investigated by an extended distribution dynamic model. The results show that the water use efficiency of the Yellow River Basin is higher than the average level in China. The water use efficiency of the lower reaches is higher than that of the upper reaches. A spatial pattern of “high in the east and low in the west” is very clear. The polarization of water use efficiency in the Yellow River Basin is obvious in some years. Spatial factors can significantly affect the regional distribution of water use efficiency. The interaction of water use efficiency in adjacent areas leads to the gradual narrowing of water use efficiency gap in the Yellow River Basin in the long term. And water use efficiency converges to the middle level. Cited: CSCD(3)
 Select Spatiotemporal differentiation and influencing factors of the coupling and coordinated development of new urbanization and ecological environment in the Yellow River Basin ZHAO Jianji, LIU Yan, ZHU Yakun, QIN Shengli, WANG Yanhua, MIAO Changhong Resources Science    2020, 42 (1): 159-171.   DOI: 10.18402/resci.2020.01.16 Abstract （1052）   HTML （213）    PDF （9139KB）（328）       Taking the Yellow River Basin as an example, in this study the coupling and coordinated development of new urbanization and ecological environment was examined, and the spatiotemporal differentiation and synchronous development state of the coupling and coordination from 2005 to 2016 were measured. Based on the Tobit model of random effect, the influencing factors of the coupling of new urbanization and ecological environment in the Yellow River Basin were explained. The findings can be summarized as follows: (1) Index values of the new urbanization and ecological environment subsystems and the coupling and coordination degree of the Yellow River Basin were rising first and then declining. (2) The average coupling degree of new urbanization and ecological environment was between 0.34~0.70, which was in the stage of moderate development. The average coordination degree of new urbanization and ecological environment in the Yellow River Basin was between 0.20~0.60, which was in the stage of low coordination and moderate coordination; (3) More than 78% of the cities in the Yellow River Basin lagged behin in ecological environment protection and the pressure of ecological environment are prominent under the background of rapid urbanization. (4) The level of economic development, capacity of the governments, and investment in science and technology have a positive impact on the degree of coupling and coordination; the degree of opening and the level of industrialization have different effects on the coupling and coordination of the upper and middle-lower reaches of the Yellow River Basin. Additional, reducing path dependency has great significance for promoting the coupling of new urbanization and ecological environment. Differentiated strategies should be adopted to promote the coupling development of new urbanization and ecological environment across the Yellow River Basin. Cited: CSCD(5)
 Select Spatiotemporal change of coastal blue carbon and its service value evaluation：A case study of Jiaozhou Bay SUI Yuzheng, CHEN Xiaoxuan, LI Shujuan, SUN Dapeng, MA Xinning, ZHOU Tao Resources Science    2019, 41 (11): 2119-2130.   DOI: 10.18402/resci.2019.11.14 Abstract （360）   HTML （18）    PDF （7947KB）（323）       Coastal blue carbon is a carbon pool similar to marine blue carbon and terrestrial green carbon, which has huge carbon sink potential and it is of important practical significance to study its carbon sequestration capacity. In this study, remote sensing data of the Jiaozhou Bay in 1997, 2007, and 2017 ,were used for interpretation and acquisition of coastal wetland data in the Jiaozhou Bay area by ArcGIS,.Based on the Integrated Valuation of Environmental Services and Tradeoffs(InVEST) model, this study evaluated the change of spatial and temporal patterns of blue carbon distribution and its service value in the Jiaozhou Bay coastal zone. The results show that: (1) In terms of time: the total blue carbon in 1997-2007 and 2007-2017 was 3.49 $×$ 10 8 and 2.32 $×$ 10 8 tons respectively, showing a decreasing trend. (2) Spatially, from 1997 to 2007, the maximum blue carbon was mainly distributed in the sub-tidal zone and the areas of reed, suaeda salsa, spartina and aquaculture ponds in Hetao, Shangma, Jiuhongtan, Jiulong Street, and in the areas of aquaculture ponds and reeds in Jiulong, Liuting, Jinghongtan and Shangma Street from 2007 to 2017. (3) The total value of blue carbon in the Jiaozhou Bay in recent 20 years is 8522.13×10 8 CNY, it is urgent to protect the coastal blue carbon ecosystem because of its huge carbon sink potential.
 Select Effects of age on farmers’ adoption of intertemporal green agricultural technology ZHANG Tongchao, YAN Tingwu, QIU Tongwei Resources Science    2020, 42 (6): 1123-1134.   DOI: 10.18402/resci.2020.06.10 Abstract （270）   HTML （4）    PDF （3715KB）（299）       Based on the intertemporal technical attributes, this study systematically explored the influence of age on farmers’ adoption of intertemporal green agricultural technology, and conducted an empirical test by employing the survey data of 1,372 farmers in Hebei, Shandong, Anhui, and Hubei Provinces and using a mediating effect model. The results show that, first, the effect of age on farmers’ adoption of intertemporal green agricultural technology is inverted U-shaped. Second, human capital and risk preference are two important mediating variables for the influence of age, whose mediating effects explain 71.94% of the effect of age. Third, information and scale of land parcels play an important role in promoting the younger farmers’ adoption of intertemporal green agricultural technology, while economic value cognition, poverty, water supply, subsidies, and punishment policies have a positive impact on the adoption of intertemporal green agricultural technology by older farmers. Social capital has a negative impact on the adoption of green technology of young farmers, but it is beneficial for old farmers to take action. In the long run, speeding up the cultivation of new professional farmers, improving the new agricultural management system, and further developing the agricultural insurance system are important ways and necessary guarantee for the adoption of intertemporal green agricultural technology.
 Select Change and adjustment direction of China’s rare earth policy ZHOU Meijing, HUANG Jianbai, SHAO Liuguo, YANG Danhui Resources Science    2020, 42 (8): 1527-1539.   DOI: 10.18402/resci.2020.08.08 Abstract （242）   HTML （0）    PDF （11321KB）（283）       This study examined the evolution process of China’s rare earth policy, analyzed the drivers and mechanism of change, and identified the direction of future policy optimization and adjustment accordingly. Based on the key policies, China’s rare earth policy development can be divided into four stages: (1) encouraging the export of rare earth and standardizing mining procedures (1985-2004); (2) implementing export quantity management and enhancing export pricing power (2005-2010); (3) improving industrial rule and order and adjusting organizational structures (2011-2014); and (4) industrial supply-side structural reform (2015-present). Next, this study used the pressure-state-response (PSR) model to analyze the drivers of policy change, and used the causal feedback diagram in system dynamics to describe the policy change mechanism. The results indicate that the drivers of China’s rare earth policy change mainly include the force of industrial supply-side problems, the constraints of national macro-policy adjustments, and the promotion of the global development trend. Generally speaking, the formulation of China’s rare earth policy to some extent lagged behind developments in the industry, was passive in nature, and lacked clear policy objectives, and its driving mechanism was mainly manifested as a forced mechanism and a restraint mechanism. Finally, this study constructed the PSR model of China’s rare earth policy in the new era, pointing out that under the dual pressures in China and internationally, the rare earth industry faces challenges such as mismatch between supply and demand, insufficient downstream application level, imperfect environmental taxation system, and endangered global competitiveness. In the future, a two-way problem-oriented and goal-oriented mechanism should be formed, and response policies should be optimized and adjusted from four aspects: optimizing resource development strategy, stimulating enterprises’ enthusiasm for research and development, improving the environmental taxation system, and formulating global resource strategic layout and industrial governance based on the characteristics of light and heavy rare earth.
 Select Environmental stress and optimized path of industrial development in the Yellow River Basin JIN Fengjun, MA Li, XU Die Resources Science    2020, 42 (1): 127-136.   DOI: 10.18402/resci.2020.01.13 Abstract （757）   HTML （203）    PDF （13083KB）（283）       The Yellow River Basin is a key area for China’s regional development strategy and national ecological security. However, affected by the location, physical environment, and resource endowments, the economic foundation of the region is relatively weak. It has formed an industrial system dominated by energy and heavy chemical industries, which greatly increased the regional ecological burden. The Yellow River Basin is facing the predicaments of weak economic foundation and weak development ability, the pressures of accelerating social and economic development and transformation of development mode, the contradictions between resource use and ecological protection and between industrial development and environmental carrying capacity, and the challenges of deteriorating local living environment. The core contents of ecological environment protection and high-quality development of the Yellow River Basin is to balance the relationship between resource use and environmental protection, the scale of development and the carrying capacity of resources and the environment, and the development of key areas and the protection of the total ecological security to ensure energy security, ecological security, food security, watershed security, and the health of human settlements. We suggest that the region should optimize the industrial development path, actively promote the new industrialization with green industrial development as its core, and improve the level of industrial development and resource and environmental efficiency; optimize the industrial space based on the resource and environmental carrying capacity, determine suitable industrial development space and ecological protection red line, promote the construction of key energy and chemical bases and the construction of industrial clusters in urban agglomerations, implement strict environmental access policies, and improve environmental control standards for industrial development; strengthen spatial control and ecological restoration of energy and mining development projects, and implement a series of regional ecological environment governance and restoration projects. Cited: CSCD(8)
 Select Surface runoff changes and their causes in the Russian pan-Arctic Region WANG Guan, CHEN Hanru, WANG Ping, WANG Tianye, YU Jingjie, LIU Changming, YANG Linsheng Resources Science    2020, 42 (2): 346-357.   DOI: 10.18402/resci.2020.02.13 Abstract （456）   HTML （16）    PDF （11111KB）（276）       Using the surface runoff data from the Global Runoff Data Base (GRDB) and the Arctic Great Rivers Observatory (ArcticGRO), this study analyzed the surface runoff variation characteristics of the six major river basins in the pan-Arctic region of Russia since 1930, and summarized the impacts of climate change and human activities on the surface runoff. The results provide a theoretical basis to further the scientific understanding of the runoff changes in the Arctic region of Russia under the background of climate change and increasing human activities, and for the rational development and utilization of water resources in the region. The results show that the annual runoff of the Severnaja Dvina, Pechora, Ob, Yenisei, Lena, and Kolyma Rivers increased at a rate of 1.53 m 3/s, 7.27 m 3/s, 15.37 m 3/s, 19.59 m 3/s, 38.41 m 3/s, and 21.15 m 3/s, respectively. The seasonal distribution characteristics of runoff are characterized by a decrease in flood peak flow during spring and summer, and an increase in runoff during winter. Seasonal distribution of surface runoff tended to be more even during the year. The change in annual runoff is mainly affected by climate change. In contrast, human activities have little effect on annual runoff in most areas. The two dominant factors, climate change and human activities, jointly drive the change in the annual distribution of runoff. Annual runoff of these rivers has increased as a result of global warming, while the annual distribution of runoff tends to be uniform under the combined effects of climate change and human activities. Cited: CSCD(1)
 Select Verification and comparison of three high-resolution surface evapotranspiration products in North China HE Shaoyang, TIAN Jing, ZHANG Yongqiang Resources Science    2020, 42 (10): 2035-2046.   DOI: 10.18402/resci.2020.10.19 Abstract （275）   HTML （6）    PDF （14387KB）（265）       The North China Plain is a critical agricultural region in China and one of the most severe water deficient areas in the world. Surface evapotranspiration (ET) is the largest component of water resource consumption, therefore obtaining accurate ET data is an important basis for water resource management on the North China Plain. In this study, accuracy verification and spatiotemporal comparison of three global high-resolution ET products were conducted in North China in order to provide a reference for the selection of a high-resolution ET data product that is more suitable for the North China Plain and can better serve the purpose of water resource research and management. Through the comparison with the eddy correlation measurement, the research showed that the PML_V2 product had the highest accuracy in North China, followed by SSEBop_V4 and MOD16A2, with correlation coefficients of 0.81, 0.74, and 0.52, respectively. The root mean square errors were 0.87, 1.52, and 1.44 (mm/d), respectively. PML_V2 showed the highest consistency with the fluctuation trend observed at the site. The correlation between the estimated and observed ET of the three products in the growing season of wheat was higher than that of maize. SSEBop_V4 ET and PML_V2 ET estimates had the highest correlation with the observed ET in wheat season and maize season, respectively. Comparatively, PML_V2 and SSEBop_V4 are more similar in spatial distribution, with the highest correlation coefficient of 0.76. The spatial distribution of MOD16A2 is very different from that of the other two products. The biggest difference of the three products appears in the cultivated land area. In 2003-2018, MOD16A2 showed a clear trend of increase for three land use types, while SSEBop_V4 and PML_V2 showed no obvious change.
 Select Potential ecological suitability evaluation of urban construction land: A case study in Baoshan District, Shanghai HE Zongfei, YU Jia, CHEN Yun, WEN Jiahong, YIN Zhan’e Resources Science    2020, 42 (3): 558-569.   DOI: 10.18402/resci.2020.03.14 Abstract （365）   HTML （12）    PDF （11720KB）（258）       Traditional ecological suitability evaluation methods based on current land use status have their limitation in supporting development decision for urban construction land in rapid urban-expansion regions. This article first proposed the concept and method of potential ecological suitability evaluation of urban construction land. The method highlights the predicted future urban land-use distribution that is regarded as an important factor in the ecological suitability evaluation framework, and generates the evaluation result that is suitable for future planning and decision making of urban construction land. This study took Baoshan District, Shanghai Municipality, China as the study area and presented the spatial distribution of ecological suitability of urban construction land in 2050 under the background of urban expansion. The result was compared with the traditional ecological suitability evaluation results. The comparison revealed that potential ecological suitability evaluation can effectively reduce the high overlaps of the lands unsuitable or moderately unsuitable to be developed and the future urban buildup areas (reducing the overlap from 9.74% and 22.7% to 0.0% and 14.5%). It can match the urban development boundary planning and ecological space planning better and highlights the key protected ecological regions in future development. The case study proved the soundness and effectiveness of the new evaluation method, which can provide better decision supporting for ecological urban planning under the background of urban expansion.
 Select Spatial evolution of specialized villages and influencing factors in the Yellow River Basin LIU Chenguang Resources Science    2020, 42 (12): 2300-2313.   DOI: 10.18402/resci.2020.12.04 Abstract （140）   HTML （9）    PDF （15830KB）（257）       The Yellow River Basin is an important core area of grain production in China and an important area to win the battle against poverty. Exploring the general pattern of the distribution and evolution of the specialized villages in the area is of great significance for the high-quality economic development of the region. Taking the specialized villages in the Yellow River Basin as the research object and using ArcGIS spatial analysis and Geodetector tools, this study comprehensively analyzed the spatial pattern evolution and influencing factors from 2008 to 2017. The results show that: (1) The concentration of the overall spatial distribution is increasing, and the concentrated distribution area is in the Guanzhong Plain and the lower Yellow River Basin; (2) The spatial pattern at the county level has changed from bands to clusters. The cluster-like agglomeration forms include suburban agglomeration, township agglomeration, and rural hinterland agglomeration; (3) Specialized villages are mainly distributed in low-altitude areas, areas with gentle slopes, along rivers, and along highways, with rapid growth; (4) The influencing factors of specialized village distribution in the Yellow River Basin are mainly in the technological, institutional, cultural, and market dimensions, and the core impact factors of spatial distribution vary in different regions. Therefore, it is recommended that underdeveloped regions, on the basis of fully exploiting their own advantages, should improve infrastructure, introduce advanced technology, and strive to produce high quality agricultural products. The developed regions should make full use of advanced technologies, well-developed management systems, and innovative culture to promote and lead the sustainable and healthy development of specialized villages.
 Select Regional correlation degree derived from the sand-fixing service spatial flow: A case study of the Beijing-Tianjin sandstorm control engineering area ZHANG Biao, WANG Shuang, LI Qingxu, XIE Gaodi Resources Science    2020, 42 (5): 969-979.   DOI: 10.18402/resci.2020.05.14 Abstract （374）   HTML （4）    PDF （10988KB）（257）       Ecosystem service spatial flow is the delivery of an ecosystem service to people or the movement of material and people. Its assessment elucidates the dominant contributors of ecosystem services and their spatial relationships. In this study, we defined a concept of regional correlation degree as the flow quantity of ecosystem services from a supply area to a demand area, which can be used as an important reference for regional ecological compensation. Based on the characteristics of wind direction and spatial location in the Beijing-Tianjin sandstorm control engineering area, this study developed a regional correlation model with the provision degree and influencing degree of sand-fixing services. Subsequently, we estimated the sand-fixing services in the sandstorm control engineering area in 2015 by the revised wind erosion equation (RWEQ), and analyzed the ecological links between different administrative districts of the sandstorm control engineering area and Beijing Municipality. The results indicate that the regional correlation degrees of sand-fixing services ranged from 0 to 13.43%. Chicheng County in Zhangjiakou City presented the highest correlation degree with Beijing, and the high correlation zones of sand-fixing services were Sunnitezuo Banner, Xuanhua District, Huaian County, Xiahuayuan District, and Suniteyou Banner. However, Wengniute Banner, Chengde County, Ningcheng County, Jixian County, and Yangyuan County showed the lowest ecological links with Beijing in sand-fixing services. The regional correlation of sand-fixing services was generally high in the west and low in the east. This phenomenon mainly can be attributed to the predominant wind direction in the Beijing-Tianjin sandstorm control engineering area, and the spatial heterogeneities of sand-fixing services. Additionally, the social and economic development levels in different districts presented negative correlation with the correlation degree of sand-fixing services. This result implies that the regions of higher correlation degree of sand-fixing services with Beijing were suffering from more severe poverty. Therefore, we concluded that Beijing should pay more ecological compensation to those counties with high correlation degrees in sand-fixing services to ensure the sustainable provision of sand-fixing services.
 Select Spatiotemporal changes and driving forces of land use in the Yellow River Basin ZHANG Baifa, MIAO Changhong Resources Science    2020, 42 (3): 460-473.   DOI: 10.18402/resci.2020.03.05 Abstract （834）   HTML （187）    PDF （11417KB）（254）       The spatiotemporal pattern of land use is an important representation of the interaction between human and nature. Study on the spatial-temporal pattern of land use and its driving factors in the Yellow River Basin and to clarify land-use conversion as well as the spatial-temporal variation of cultivated land, ecological land and urban-rural construction land, which can provide some reference for the planning and implementation of the national strategy of ecological protection and high-quality development of the Yellow River Basin. Based on the transfer matrix of land use types and spatial autocorrelation, the study explored the land use in the Yellow River Basin provinces from 1970 to 2015 by using land use data of seven periods from multiple scales of city cluster, province, city, and county. The results show that: (1) The proportion of ecological land and arable land in the Yellow River Basin is 79.04% and 18.64% respectively on average, indicating that ecological protection and food production are two main functions there; (2) The urban-rural construction land proportion increases year by year, and urban agglomeration region is the main space of construction land expansion; (3) Moran’s I of arable, ecological, urban-rural construction land of the Yellow River Basin provinces was more than 0.75 in different years and showed a strong positive spatial agglomeration effect and a pattern of concave type distribution ; (4) The expansion of urban-rural construction land is at the expense of arable land, and at the same time, part of rural land is gradually transformed into urban land, and the imbalance between human and land is increasingly prominent. (5) Population size and economic development are the core factors to promote land use change, and the performance of different spatial driving factors is inconsistent. There will not appear large-scale expansion of urban and rural construction land with the economic development in Shandong and Henan provinces located in the lower reaches of the Yellow River. Cited: CSCD(1)
 Select Construction of a comprehensive observation platform for natural resource elements based on Internet of Things and Open Data Processing Service technologies SUN Yi, FANG Mengyang, HE Jianning, LIU Jiufen, ZHANG Siyuan, YANG Wantao, GAO Tiansheng Resources Science    2020, 42 (10): 1965-1974.   DOI: 10.18402/resci.2020.10.13 Abstract （193）   HTML （4）    PDF （11325KB）（238）       The characteristics of the comprehensive observation data of natural resource elements are multiple sources, complex types and huge data volume. It is necessary to establish a comprehensive observation platform for natural resource elements (COPN) for the unified management and utilization of data. This article builds a comprehensive observation platform for natural resource elements (COPN) based on Internet of Things (IoT) and Open Data Processing Service (ODPS) technology, it mainly includes three modules: a natural resource element data center, an Internet of Things center, and a model cloud center. The platform enables the processes of data transmission, processing, and analysis from sensors to model clouds. The COPN serves the integrated management of natural resources across China and provides decision support for macro-control. The platform designed in this study will explore the design of various natural resource element related models and modularize them for scientific research and practical applications.
 Select Suggestions for strategic allocation of the Yellow River water resources under the new situation JIA Shaofeng, LIANG Yuan Resources Science    2020, 42 (1): 29-36.   DOI: 10.18402/resci.2020.01.03 Abstract （701）   HTML （199）    PDF （3351KB）（238）       The Yellow River Basin plays an important role in China’s social development and ecological security. Ecological protection and high-quality development in the Yellow River Basin have become a significant national strategy, which makes higher requirements on water resources allocation of the basin. The water allocation should not only help ecological system protection but also ensure high-quality development. With the impact of climate change and human activities, the overall runoff of the Yellow River has decreased in recent decades, but it has recovered slightly in the past several years, and the sediment inflow has decreased significantly compared with the historical situation. To meet the water demand of high-quality development in the Yellow River Basin, based on the new situation of runoff and sedimentation and regional water supply and demand, this article estimated the reserved ecological and sediment transport water on the lower reaches (8~12 billion m3), alternative water supply of the Yellow River by the South-to-North Water Diversion Project and seawater utilization (2.5~4.5 billion m3), and water demand for the development of some of the industries on the upper and middle reaches. Then scenarios of the Yellow River water resources allocation scheme were designed. To strengthen water resource security for the strategic development in the Yellow River Basin, it is necessary to improve the institutional arrangements and regulations of water right transfer and compensation, and explore the coupling mechanism of water and land spatial adjustments. Cited: CSCD(6)