退牧（耕）还草（林）与甘肃的可持续发展

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苏孜;孙晓娟

Relation of Returning Pasture (Cropland) to Grassland (Forestry) and Sustainable Development in Gansu Province

SU Zi;SUN Xiao-juan

中国沙漠 . 2006, (4): 664 -669 .