Characteristics of grassland degradation and driving forces in the source region of the Yellow River from 1985 to 2000*

LIU Linshan, ZHANG Yili, BAI Wanqi, YAN Jianzhong,DING Mingjun,, SHEN Zhenxi, LI Shuangcheng, ZHENG Du

Journal of Geographical Sciences . 2006, (2): 131 -142 . DOI: 10.1007/s11442-006-0201-4