4Nian-Feng Lin, Jie Tang. Geological environmental and the causes for desertification in arid and semiarid regions in China[J].Environmental Geology, 2001,41(7) :806 -815.
5汤洁,林年丰.农业生态地质环境质量综合评价-以吉林乾安为例[A].见:邵时雄,候春堂.中国农业地质研究新进展[C].北京:Scientist Press International Inc.,1999.93～99.
