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

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.