LI Lin, LI Feng-xia, ZHU Xi-de, CHANG Guo-gang, GUO An-hong . Quantitative identification of driving force on wetland shrinkage over the source region of the Yellow River[J]. JOURNAL OF NATURAL RESOURCES, 2009 , 24(7) : 1246 -1255 . DOI: 10.11849/zrzyxb.2009.07.012