4Mainguet M, Silva G G DA. Desertification and drylands development: what can be done [J].Land Degradation & Development, 1998,9:375 - 382.
5Chen Y,Tang H. Desertification in North China: background,anthropogenic impacts and failures in combating it[ J]. Land Degradation & Development,2005,16:367 - 376.
6Gisladottir Stocking. Land degradation control and its global environmental benefits [ J 1. Land Degradation & Development, 2005, 16:99 - 112.
7Yang X P,Rost K T,Frank L. The evolution of dry lands in northem China and in the Republic of Mongolia since the Last Glacial Maximum[J]. Quaternary International,2004,118 : 69 - 85.
8Qiu Z, Zhang Y, Fang Y Q. Removal of oil from concentrated wastewater by attapulgite and coagulant [J]. Water Quality Research Journal of Canada, 1995,30:89 -99.
9Garcia A S,Alastuey A,Querol X. Heavy metal adsorption by diferent minerals : application to the remediation of polluted soils [J]. The Science of total environment, 1999,242 : 179 - 188.
10Garcia A S,Alvarez A A,Junenez O B. Sorption of heavy metals from industrial wastewater by low cost mineral silicates( Palygorskite, Smectite) [J]. Clay Minerals,1999,34:469 -478.