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作 者 ：刘奉觉 郑世锴 臧道群

期 刊 ：林业科学 1987年 23卷 zj1期 页码：35-44

关键词：杨树；

摘 要 ：为了探讨杨树速生丰产林蒸腾耗水与林木生长的关系，为林木合理灌溉提供根据，于1983-1984年研究了杨树丰产林在空间和时间上的蒸腾变异。结果表明：叶下表面的蒸腾大于上表面，同一叶表面不同部位的蒸腾值相近；枝条上顺序叶位的蒸腾值呈波动式变化；树冠下部蒸腾较高、中部居中、上部较小；蒸腾日变化进程(晴天)一般呈单峰曲线，峰值出现在上午10时左右；蒸腾的季节变化,初春较高，以后下降，秋季蒸腾回升，生长末期下降。根据影响蒸腾的空间因素、时间因素,气象因素等确定了估算树冠月蒸腾耗水量的参数公式，并计算了树冠蒸腾耗水量。

Abstract:The transpiration variation in space and time in a young poplar plantation(Populus deltoides Bartr.cv.‘Lux’ex．I-69/55)was studied in 1983—1984 for the purpose of inquiring into the relationship between transpiration water-consumption and growth in young poplar plantation so as to provide an evidenee for rational irrigation．The research has revealed that the transpiration of abaxial surface is higher than that of adaxial;the transpiration rates of different position on identical leaf surface are Similar；there is a fluetuaring movement in transpiration rate along an ordinal leayes of a branch;the transpiration is higher in low layer of crown，medium in middle layer and lower in the upper layer;the daily transpiration process(sunny day)forms a curve with a peak at about 10 am．；the seasonal fluctuation of transpiration is as follow：transpiration is higher in early spring，then goes down，rises in the autumn and goes down again by the end of growing season．A formula for estimation of crown transpiration water-consumption has been determined according to the analysis of the factors influencing transpiration in space and time and meteorological factors，and the transpiration water-consumption of crown was estimated by use of the formula．

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