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黄土高原沟壑区退耕还林典型优化模式机理分析
李世东, 张丽霞
Mechanism analysis of optimized model of conversion from farmland to forestland in the hill-gully sub-region of Loess Plateau
LI Shidong, ZHANG Lixia
应用生态学报 . 2004, (9): 1541 -1546 .