TheKeyLabofResourcesEnvironment&GISinBeijingCity;
CapitalNormalUniversity;
Beijing100037;
P.R.China;
ScienceInstituteofWaterandSoilConservationofJiangxiProvince;
Nanchang330029;
P.R.China;
SoilandFertilizerResearchInstitute;
ChineseAcademyofAgriculturalSciences;
Beijing100081;
P.R.China;