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The Association Analysis of Herbage Yield and Meteorological Factors in Alpine Meadow

LI Ying-nian,ZHOU Hua-kun,SHEN Zhen-xi (Northwest Plateau Institute of Biology,the Chinese Academy of Sciences,Xining Qinghai 810001,China)  
In this paper,accumulation of above-biomass could be described by logistic equation as same as process of growth and decline in other biological populations during the growing season of alpine meadow.The accumulation had four stages,gradually increasing,stupid increasing,stability and decreasing during seasonal process with changes in environmental factors. We employed the method of gray association analysis.The results showed that factors influence herbage production in the alpine meadow suggest that the precipitation in alpine meadow is enough to the water requirement of herbage growth on the whole and the air temperature is the main limiting factor.The ordination of its influence is given below. The average air temperature in January>the average air temperature from May to August>the sunshine time from May to August>the comprehensive cooperation of heat and water(the ratio of the precipitation and average air temperature)from May to August>the precipitation from May to August>the precipitation from September to November(when it is)in the late time of last year.If resolving coefficient is 0.5,the ordination of association degree associated with the given factors above is:0.8348>0.7913>0.7713>0.7540>0.7430>0.6384. Modeling equation of evaluating and predicting herbage yield alpine meadow was predicted by GW=a+bj覺j after main composition analysis on each meteorological factor discussed above.The equation can be looked as the tool for evaluating and predicting herbage yield in alpine meadow because of its good forecast effect.
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