新疆杨、速生杨（中林-46）树种光合特性研究

通过对新疆杨、速生杨沙地造林树种光合特性比较研究发现：（1）新疆杨、速生杨是高光能利用效率树种：新疆杨净光合速率平均值高于速生杨（中林-46）；（2）新疆杨树种蒸腾速率受气温、空气相对湿度及水汽压的直接影响而变化的幅度大于速生杨（中林-46）；（3）新疆杨水分利用效率高于速生杨（中林-46）；（4）新疆杨和速生杨树种的光能利用效率，与水分竞争能力之间具有互补性，反映出这2种杨树对干旱环境的适应策略较强；（5）速生杨气孔导度均值大于新疆杨气孔导度，但是，新疆杨气孔导度值变化幅度较大。

Photosynthetic Characteristics of Species of Populus bolleana and Fast Growing Poplar (Zhonglin-46)

Comparison tests of photosynthetic characteristics of Populus bolleana fast growing poplar(zhonglin-46) were conducted.The finding shows:(1) Populus bolleana and fast growing poplar(zhonglin-46) are the high efficiency of solar energy utilization;the mean net photosynthetic rate(Pn) of Populus bolleana is higher than that of fast growing poplar(zhonglin-46),(2) the varied range of transpiration rate of Populus bolleana directly affected by temperature,relative humidity and water vapor pressure is bigger than that of fast growing poplar(zhonglin-46),(3)the water use efficiency of Populus bolleana is higher than that of fast growing poplar(zhonglin-46),(4)light use efficiency(LUE) and water competitive capacity(WCC) between the tree species of Populus bolleana and fast growing poplar are complimentary,which shows that drought-resistance of these 2 species poplar trees to is stronger,and(5) the mean stomatal conductance(Gs) of fast growing poplar is higher than that of Populus bolleana of which the varied range is great.