共和县塔拉滩天然草地牧草产量影响因子的主成分分析

ANALYSIS ON THE PRINCIPAL COMPONENT OF HERBAGE YIELD ON TALATAN NATURAL PASTURE IN GONGHE COUNTY

通过对青海共和县塔拉滩天然草地牧草产量影响因子:年降水量、≥0℃年积温、年均温、年日照时数、3~8月≥0℃积温、3~8月日照时数、3~8月均温、3~8月降水量22a资料的主成分分析,结果表明:作为最主要综合指标的第一主成分为≥0℃年积温、3~8月≥0℃积温、3~8月均温的影响,贡献率是59.17%,第二主成分中的年均温、年降水量和3~8月均温的作用,贡献率为25.52%,第三主成分中的年降水量、年日照时数、3~8月降水量、3~8月日照时数因素,贡献率为9.30%。天然草地牧草产量的形成是众多自然因子综合作用下相协调的产物,其中热量因子是牧草生长的重要原因。

An analysis was made on the principal component of impact factors of herbage yield on Talatan natural pasture in Gonghe County,including annual rainfall,accumulative temperature more than or equal to zero centigrade,annual mean temperature,annual sun-shine hours,accumulative temperature more than or equal to zero centigrade,sun-shine hours and annual monthly temperature and rainfall from March to August.It is shown that the contribution rate is 59.17%,which is affected by the most principal component of the comprehensive indicators of the annual mean temperature more than or equal to zero centigrade,the accumulative one more than or equal to zero centigrade and the average temperature from March to August. The contribution rate is 25.52%,which is affected by the second principal component of the comprehensive indicators of the annual mean temperature,annual rainfall,and the average temperature from March to August. The contribution rate is 9.30%,which is affected by the third principal component of the comprehensive indicators of the annual rainfall,annual sun-shine hours,rainfall and sun-shine hours from March to August.The formation of herbage yield on natural pasture is the production coordinated under the comprehensive action of multiple natural factors,and the heat factor is the important reason of herbage growth.