Food security:the impact of land conversion from farmland to forest or grassland on grain production in Northwest China
FENG Zhi-ming, ZHANG Peng-tao, SONG Yu
JOURNAL OF NATURAL RESOURCES ›› 2002, Vol. 17 ›› Issue (3) : 299-306.
Food security:the impact of land conversion from farmland to forest or grassland on grain production in Northwest China
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