9种针阔叶幼树的蒸腾速率、叶水势与环境因子关系的研究

应用QK-1气孔仪和压力室测定了樟子松、青杨等9种针阔叶幼树的蒸腾速率与其叶水势及与环境因子的关系。采用多元线性回归和逐步回归对观测值的统计分析结果表明:在土壤供水良好的条件下,其蒸腾速率主要受气象因子的影响,与其叶水势的相关性不显著。控水试验结果表明:在水分胁迫条件下其蒸腾速率与其叶水势和土壤含水量的相关性最显著。

TRANSPIRATION RATE OF CONIFEROUS AND BROADLEAF YOUNG TREES AS A FUNCTION OF WATER POTENTIAL OF THEIR LEAVES AND OF ENVIRONMENTAL FACTORS

The relationships of the transpiration rate of nine species of coniferous and broadleaf young trees to the water potential of their leaves and to the environmental factors were determined by means of a QK-1 stomatograph and a pressure chamber. These young trees are Finns sylvestris var.mongolica, Populus cathayana, etc. The data obtained were analysed by polynomial linear regression and stepwise regression. The results from statistic analyses show that, under the condition of water well-fed soil, the transpiration rates were mainly dependent on climatic factors and not significant in correlation with the water potential of their leaves. The results from water controlled experiments show that, under the condition of water stress,there was a quite significant correlation of the transpiration rate with the water potential of their leaves and the moisture percentage of soil.