环境因素对紫花苜蓿叶水势与蒸腾速率影响的初步研究

Preliminary study on the effect of environmental factor on leaf potential and transpiration rate of alfalfa

摘要: 植物叶水势及其蒸腾速率除取决于本身的生物学特性外，还受外界环境因子所制约。该文根据有关田间试验资料全面分析了叶水势、蒸腾速率在不同灌溉水平下的日变化规律，并探讨了其与土壤含水率和气象因素(气温、净辐射和饱和差)之间的关系，建立了叶水势和蒸腾速率与气象因素间的定量关系式，对紫花苜蓿的合理灌溉具有指导意义。

Abstract: Generally, the changes of the leaf potential and the transpiration almost depend on the characteristics of biology, and also are constrained by environmenal factors. Thereby, according to the data of the field tests, the daily variation law of leaf potential and the transpiration was analyzed under the different levels of irrigation. The relationships among leaf potential, transpiration rate and soil water content, meteorology factors(including temperature, net radiation, saturation deficiency) were analyzed. And the quantity formula of leaf potential, the transpiration and environmental factors was established. The study has reference significance for instructing reasonable irrigation of alfalfa.