中文摘要：

为研究光照强度、风速、叶龄对桉树幼树蒸腾速率的影响,采用盆栽试验人工控制透光度和风速的方法,对桉树幼树的蒸腾速率进行测定,并同步观测气象因子。结果表明：（1）桉树蒸腾速率随着光照强度增加而增强,当光照强度超过720μmol/m^2·s时,其蒸腾速率开始下降;不同透光度处理下桉树蒸腾速率的峰值出现时间不同,峰值出现时间主要受光照强度的影响,均在500~720μmol/m^2·s的光强范围,峰值区间为0.018~0.024 g/cm^2·h。（2）幼龄叶的蒸腾容易受强光抑制,而大龄叶易受低光限制。（3）气温较低、蒸腾速率较小情况下,风速对桉树幼树蒸腾速率无显著影响。（4）桉树蒸腾速率与饱和水气压差、光照强度和空气温度呈正相关关系,与空气相对湿度负相关。

英文摘要：

In order to investigate the effects of light intensity,wind speed and leaf age on transpiration of potted Eucalyptus saplings,Eucalyptus saplings transpiration rate were observed with pot experiments,in which light intensity and wind speed were controlled. Meteorological factors were monitored simultaneously. The results showed that： transpiration rate of Eucalyptus increased as the light intensity enhancing. When the light intensity was more than 720 μmol/m^2·s,the transpiration rate began to decline. The peak value emerged in different periods under different light intensities. The times of peak value emerging were mainly affected by light intensity. The peak values were 0.018 g/cm^2·h to 0.024 g/cm2·h when light intensities ranged from 500 μmol/m^2·s to 720 μmol/m^2·s. The transpiration of young leaves were easy restrained by strong light,but for the old leaves,the transpiration were restrained under low light level. No significant change was found in the influence of wind speed on Eucalyptus saplings transpiration under the conditions of low air temperature and low tree transpiration rate. Positive correlations were found between the vapor pressure deficit,light intensity,air temperature and the Eucalyptus saplings transpiration rate. There was a negative correlation between air humidity and transpiration rates.