Resources Science ›› 2020, Vol. 42 ›› Issue (12): 2451-2462.doi: 10.18402/resci.2020.12.15

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Quantitative assessment of the supply-demand relationship of soil conservation service in the Sushui River Basin

YANG Liwen1,2,3(), WANG Dayong4, WANG Yongzhi3, LIANG Ze2, WU Shuyao2, LI Shuangcheng2()   

  1. 1. Department of Resources and Environmental Engineering, Shanxi Institute of Energy, Jinzhong 030060, China
    2. Laboratory for Earth Surface Processes, Ministry of Education, Peking University, Beijing 100871, China
    3. School of Geographical Sciences, Shanxi Normal University, Linfen 041004, China
    4. Climate Center of Shanxi Province, Taiyuan 030006, China
  • Received:2020-04-25 Revised:2020-08-07 Online:2020-12-25 Published:2021-02-25
  • Contact: LI Shuangcheng E-mail:wangdayong05@lzb.ac.cn;scli@urban.pku.edu.cn

Abstract:

Soil conservation services is an important ecosystem regulation service. Quantitative assessment of the supply-demand relationship of soil conservation service may play a critical role in the environmental management of watershed. In this study, we calculated the supply of soil conservation service in the Sushui watershed using the Revised Universal Soil Loss Equation (RUSLE), and quantified the demand of soil conservation service using the indicators of per unit soil nutrient loss and reservoir silt cleaning cost. Then we analyzed the relationship between supply and demand, which was validated by data from a questionnaire survey. Our results show that: (1) The supply area of soil conservation service was primarily distributed in the Zhongtiao Mountainous area in the upstream of the river, where the land-use types were mainly woodland and grassland. The demand area of soil conservation service was primarily distributed on alluvial plains in the middle and lower reaches of the river, where the land-use type was non-irrigated farmland. (2) The balanced area of supply and demand in 2000 and 2015 were 34.80% and 76.27% of the Sushui watershed area, respectively. The improvement of supply-demand relationship was due to the reduction of demand, which was mainly because of the decrease of rainfall erosivity. Our study revealed the status and influencing factors of the spatial and quantitative relationship between supply and demand, which could provide a theoretical support for land-use planning and natural resources management.

Key words: soil conservation service, supply-demand balance, ecosystem services, quantitative assessment, land use, residents' satisfaction, Sushui River Basin