桑树的蒸腾作用及其与气象因子的关系分析

夏季是桑树生长发育的旺盛时期和水分供应的敏感时期 ,需合理的灌溉。调查测定桑树在夏季的平均蒸腾强度T(H2 O) =1 0 6 4 2mmol/m2 ·s。研究桑树的蒸腾作用与日平均气温、日最高气温、日最低气温、降雨、地面蒸发量和日照等 6种气象因子的相关关系 ,并采用多元回归分析的方法建立了桑树的蒸腾作用与 5种气象因子的全回归模型、优化回归模型和多项式多元回归模型 ,经F检验均达到极显著水平。分析结果表明 :日地面蒸发量对桑树蒸腾强度影响最大 ,其次为日最高气温 ;日照和降雨是通过影响地面蒸发量而影响桑树蒸腾强度的。

Study on the Transpiration in Mulberry and its Relationship With Climate Factors

The transpiration of mulberry in summer was studied in this paper.The result showed that the transpiration rate in mulberry is 1.064 2 mmol/m 2·s in average.The correlation and regression relationship between the transpiration in mulberry and 5 climate factors,including average air temperature per day,the highest air temperature per day,the lowest air temperature per day,rainfall,evaporation per day and sunlight,were analyzed.Based on the multiple regression procedure,the full,forward selection and multinomial regression models between the transpiration in mulberry and 5 climate factors were established,which all met the 0.01 significance level with the F test.The results showed that the evaporation per day affect the transpiration rate in mulberry mostly,the next is the highest air temperature per day.The sunlight and rainfall affect the evapporation firstly,and then to affect the transpiration rate in mulberry.