8WORLD Bank ,FAO ,UNDP ,UNEP. Land quality indicators [M ]//No. 315 of the World Bank discussion papers. Washingtong,D. C :The International bank for Reconstruction and Development ,The World Bank,1995:1 -15.
9BULLOCK P,GREGORY P J. Soil in the urban environment [ M ]. Oxford: Blackwell Scientific Publications, 1991.