冀西北高原植被生产力与退耕对策

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刘玉华, 张立峰

Actual productivities of different vegetations in northwest plateau of Hebei Province and strategies of converting farmland to forest and pasture land

LIU Yuhua, ZHANG Lifeng

应用生态学报 . 2004, (11): 2113 -2116 .

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