Journal of Geographical Sciences ›› 2021, Vol. 31 ›› Issue (10): 1453-1468.doi: 10.1007/s11442-021-1906-0

• Research Articles • Previous Articles     Next Articles

Three-dimensional modelling of soil organic carbon density and carbon sequestration potential estimation in a dryland farming region of China

SUN Zhongxiang1(), BAI Huiqing2, YE Huichun1,3, ZHUO Zhiqing4, HUANG Wenjiang1,3,5,*()   

  1. 1. State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, CAS, Beijing 100094, China
    2. Key Laboratory of Plant Resources, Institute of Botany, CAS, Beijing 100093, China
    3. Key Laboratory of Earth Observation of Hainan Province, Sanya 572029, Hainan, China
    4. Institute of Agricultural Remote Sensing and Institute of Agricultural Remote Sensing and Information Technology Application, Zhejiang University, Hangzhou 310058, China
    5. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-12-28 Accepted:2021-07-21 Online:2021-10-25 Published:2021-12-25
  • Contact: HUANG Wenjiang E-mail:sunzx@aircas.ac.cn;huangwj@aircas.ac.cn
  • About author:Sun Zhongxiang (1991-), PhD, specialized in soil organic carbon and spatial analysis. E-mail: sunzx@aircas.ac.cn
  • Supported by:
    Youth Innovation Promotion Association CAS(2021119);Future Star Talent Program of Aerospace Information Research Institute, Chinese Academy of Sciences(2020KTYWLZX08);National Special Support Program for High-level Personnel Recruitment

Abstract:

Soil organic carbon density (SOCD) and soil organic carbon sequestration potential (SOCP) play an important role in carbon cycle and mitigation of greenhouse gas emissions. However, the majority of studies focused on a two-dimensional scale, especially lacking of field measured data. We employed the interpolation method with gradient plane nodal function (GPNF) and Shepard (SPD) across a range of parameters to simulate SOCD with a 40 cm soil layer depth in a dryland farming region (DFR) of China. The SOCP was estimated using a carbon saturation model. Results demonstrated the GPNF method was proved to be more effective in simulating the spatial distribution of SOCD at the vertical magnification multiple and search point values of 3.0×106 and 25, respectively. The soil organic carbon storage (SOCS) of 40 cm and 20 cm soil layers were estimated as 22.28×1011 kg and 13.12×1011 kg simulated by GPNF method in DFR. The SOCP was estimated as 0.95×1011 kg considered as a carbon sink at the 20-40 cm soil layer. Furthermore, the SOCP was estimated as -2.49×1011 kg considered as a carbon source at the 0-20 cm soil layer. This research has important values for the scientific use of soil resources and the mitigation of greenhouse gas emissions.

Key words: soil organic carbon density, gradient plane nodal function, soil organic carbon storage, soil organic carbon sequestration potential