[Tan, Qiqi; Wang, Guoan] China Agr Univ, Coll Resources & Environm Sci, Dept Environm Sci & Engn, Beijing Key Lab Farmland Soil Pollut Prevent & Re, Beijing 100193, Peoples R China.
[Tan, Qiqi] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Hulunber Grassland Ecosyst Observat & Res St, Beijing 100081, Peoples R China.
[Tan, Qiqi; Li, Xiran] Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA.
[Tan, Qiqi; Li, Xiran] Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA.
[Han, Wenxuan] China Agr Univ, Coll Resources & Environm Sci, Dept Ecol & Ecol Engn, Beijing 100193, Peoples R China.