环境因子对高寒牧草生长影响程度的关联排序及产量评估模式的确立

利用灰色关联分析方法，通过生态因子对高寒草甸牧草产量影响的结果程度表明，高寒草甸地带降水量基本可满足牧草生长发育的需求，而温度因子则成为主要的限制因子。其影响程度大小排序有：1月平均气温＞5～8月平均气温＞5～8月日照时数＞5～8月水热综合配合（降水量与气温的比值）＞5～8月降水量＞上年度末9～11月的降水量。在分辨系数取0．5的条件下，以上各因子所对应的关联度排序有：0．835＞0．791＞0．771＞0．754＞0．734＞0．638。将上述各生态因子进行主成分处理后，建立评估或预报高寒草甸牧草产量的模拟模型方程是：GW=a＋ΣajXj。其拟合及试报效果均很好，故可作为高寒草甸牧草产量的评估或预测预报工具。

THE ASSOCIATION ORDINATION OF THE ECOLOGIRAL FACTOR SINFLUENCE ON THE HERBAGE YIELDIN ALPINE MEADOW

In this paper, we empolyed the method of grey association analysis. It's result that main ecological factors influance herbage yield in the alpine meadow suggests that the precipitation in the 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 as 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 of last year.Assuming resolving coefficient is0.5, the ordination of assosiation degree associated with the given factors above is:0.8348>0.7913>0.7713>0.7540>0.7430>0.6384.