LU Ke-xin1,LI Zhan-bin1,ZHANG Xia2,YU Guo-qiang3(1.Key Lab.of Northwest Water Resources and Environment Ecology of MOE,Xi'an University of Technology,Xi'an 710048,2.Shaanxi Institute of Environmental Science,Xi'an 710054,3.Xi'an Institute of Geology and Mineral Resources,CGS,Xi'an 710054)
S157.1