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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。
Plant leaf water potential and its transpiration rate in addition to its biological characteristics, but also by the external environmental factors. Based on the field experiment data, the diurnal variation of leaf water potential and transpiration rate under different irrigation levels were comprehensively analyzed. The relationship between soil water content and meteorological factors (temperature, net radiation and saturation difference) was also discussed. The establishment of a quantitative relationship between leaf water potential and transpiration rate and meteorological factors has the guiding significance for the rational irrigation of alfalfa.