TAI Ji-cheng1,2,JIN Zhen-jiang1,3,CUI Li-qiang1,PAN Gen-xing1(1.Institute of Resources,Ecosystem and Environment of Agriculture,Nanjing Agricultural University,Nanjing,Jiangsu 210095,2.College of Agriculture,Inner Mongolia University for Nationalities,Tongliao,Inner Mongolia 028042,3.College of Environmental Science and Engineering,Guilin University of Technology,Guilin,Guangxi 541004)