%0 Journal Article %T %D 2009 %R 10.13249/j.cnki.sgs.2009.02.250 %J SCIENTIA GEOGRAPHICA SINICA %P 250-254 %V 19 %N 2 %X %U http://geoscien.neigae.ac.cn/EN/10.13249/j.cnki.sgs.2009.02.250