三江源区高寒草地牧草产量主要影响因子分析

Major influencing factors for grass crop of high and cold meadow in Three River Source

利用高寒草地多年牧草产量和主要气象因子,运用主成分法分析了影响牧草产量的影响因子,并用逐步回归分析法建立了牧草产量回归统计模型,结果表明,影响牧草产量的因子顺序为:7月份温度x4>4月降水x8>8月日照x19>6月日照x17>生长期总降水量x13>7月降水x11。结合通径分析方法对影响因子进行分析,对牧草产量的直接作用大小顺序依次为:生长期总降水量x13>4月降水x8>8月日照x19>6月日照x17>7月份温度x4>7月降水x11。

According to the high and cold meadow grass crop yield and the main meteorological factor,we analyzed the influence factors for grass crop using the principal components law,and established the grass crop return statistical model with the stepwise regression analytic method.The result indicated that the influence factor order is： In July temperature x4 〉in April precipitation x8〉 in August sunshine x19 in June sunshine x17 vegetal period total precipitation x13〉 in July precipitation x11.The union path analysis method was carried on to analyze the influence factors having direct action to grass crop.that is： Vegetal period total precipitation x13〉 in April precipitation x8〉 in August sunshine x19〉 in June sunshine x17 in July temperature x4 in July precipitation x11.