【摘要】 采用多元回归分析的方法研究了桑树春芽不同发育阶段的时间与气温、日照、降雨、地温和蒸发 5种气象因子的关系。建立了从桑芽膨芽期至脱苞期、鹊口期、开 1叶、开 2叶、开 3叶、开 4叶和从开 1叶至开 4叶共 7个阶段发育时间与 5种气象因子的回归模型 ,经F检验表明这些模型均达到极显著水平 ;进一步采用向前逐步回归分析得出优化回归模型 ,表明 5种气象因子中地温对桑树发芽的影响最大 ,其次为气温。更多还原

【Abstract】 Based on the multiple regression procedure,the relationship between development of the mulberry budding in spring and climate factors,including air temperature,sunlight,rainfall,ground temperature and evaporation,were studied.The regression models in 7 mulberry budding stages,including the stages from bud swelling to green tip sprouting,leaf apex opening,1st leaf,2nd leaf,3rd leaf,4th leaf and 1st leaf to 4th leaf were established. F test showed that the regression models all met the 0.01 significance level.Based on the forward selection regression procedure,the excellent regression models were got,which showed that ground temperature affected development of the mulberry budding in spring mostly,the next is air temperature.更多还原