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ANALYSIS ON THE ECO-ENVIRONMENTAL VULNERABLE MECHANISMS OF LAND DESERTIFICATI ON IN THE FARMING-PASTORAL ECOTONE IN NORTH CHINA
ZHANG Dian-fa, BIAN Jian-min
Arid Land Geography . 2000, (2): 133 -137 .  DOI: 10.13826/j.cnki.cn65-1103/x.2000.02.008