7Houghton J T Ding Yihui ,D Griggs. Climate Change 2001 [A] . The Scientific Basis Summary for Policymakers and Technical Summary of Working Group I Report [C]. Cambridge: Cambridge University Press, 2001:1 - 98.
8王绍武,董光荣.中国西部环境特征及其演变[M].北京;科学出版社,2002.248-249.
9Varol Memet,en Biilent Assessment of nutrient andheavy metal contamination in surface water andsediments of the upper Tigris River[J]. Turkey Catena,2012,92:1.
10Bhuiyan MAH, Parvez L, Islam M A, et al. Heavymetal pollution of coal mine-affected agricultural soils inthe northern part of Bangladesh [ J ]. Journal ofHazardous Materials, 2010,173:384.
