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Managment and Optimization Model for Rangelands in Western China

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【Author】 Zan Tingquan;Li Zizheng Lanzhou University,PRC

【摘要】 <正> Introduction The climatic characteristics of Northwestern China is dry with little precipi-tation and frequent wind flows, i. e. croncuced continental climate The annual rain-fall in most of the rangelands is between 250 to 600mm, majority of which are concen-trated in summer. This region is categorized as an arid desert grassland, or a semi-aridrange belt, or a semi-moist mountain rangeland Due to lack of scientific manage-ment policy as well as neglecting the ecological cycle of resource replenishment,

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