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1979—1980年分别在温室和苗圃条件下测定了十种杨树苗木蒸腾速率的日变化和季节变化,估算了各个品种的蒸腾耗水量。根据蒸腾速率与光合速率的比值评定了各品种对土壤水分的利用效率。此外,还测定了叶片的保水力、气孔数目以及气孔活动与水分逆境的关系。综合分析以上试验结果,按各品种耐旱与喜水程度的排列次序将十种杨树划分为五个组,供生产上参考。
From 1979 to 1980, the diurnal and seasonal changes of transpiration rate of ten poplar seedlings were measured in greenhouse and nursery respectively, and the transpiration water consumption of each species was estimated. According to the ratio of transpiration rate to photosynthesis rate, the utilization efficiency of soil moisture by different varieties was evaluated. In addition, the leaf water retention, the number of stomata and the relationship between stomatal activity and water stress were also measured. A comprehensive analysis of the above test results, according to the drought tolerance of each variety and the degree of hi-water arrangement of ten poplar is divided into five groups for production reference.