Resources Science ›› 2019, Vol. 41 ›› Issue (12): 2307-2315.doi: 10.18402/resci.2019.12.14

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Distribution and influencing factors of soil organic carbon of cultivated land topsoil in Beijing

KONG Xiangbin1, HU Yingjie2, LI Yue1, DUAN Zengqiang1   

  1. 1. College of Land Sciences and Technology, China Agricultural University, Beijing 100193, China
    2. College of City Construction, Jiangxi Normal University, Nanchang 330022, China
  • Received:2018-09-27 Revised:2019-09-24 Online:2019-12-25 Published:2019-12-25

Abstract:

Soil organic carbon (SOC) is an ecological factor as well a typical fertility factor. The study of distribution characteristics and influencing factors of SOC are of great significance for enhancing the cultivated land production capacity and soil carbon storage. Based on agricultural soil sampling data, land use map, digital elevation model (DEM), and cultivated land type distribution map in 2010 and using the zonal statistic function of ArcGIS 10.0 software, we analyzed the spatial distribution feature of SOC density and the influence of natural and human factors in Beijing. The results are as follows: (1) In 2010, the average SOC density of the cultivated land in Beijing was 22.51 t/hm 2 and the carbon storage was 990.34×10 4 t; (2) The SOC densities of cultivated land topsoil in the northwestern mountainous areas and suburban areas were higher than the other areas in Beijing. The average SOC density in the surface soil in Mentougou District was the highest among all the 16 districts, reaching 39.93 t/hm 2 ; (3) Topography, soil type, soil texture, and planting type had significant effects on SOC density, The organic carbon density of cultivated topsoil generally increased with altitude; The SOC density of brown soil and cinnamon soil is higher than the other soil types, and the SOC density of cultivated topsoil generally increased with the clay content; The cultivated SOC density of cash crops is slightly higher than that of grain crops; (4) The comprehensive analysis showed that the SOC density of spring maize was the highest in middle and low mountain areas, while the open-air vegetable and facility agriculture fields had the highest SOC densities in hills and plain areas. The adjustment of cultivated land use in Beijing should consider the influence of topography, soil condition, and human factors on the SOC content of cultivated land, and the carbon sequestration capacity of cultivated land should be improved or maintained according to local conditions.

Key words: cultivated land, topsoil, organic carbon density, organic carbon storage, cultivated land use, Beijing Municipality