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辽宁省建平县半干旱地区不同来源的８种杨树无性系净光合速率（Ｐｎ）达到了显著和极显著的差异水平，无性系间的净光合速率可分为高中低三个类群，即：昭林杨６号、群众杨、赤峰杨３４号、欧美杨４７；小黑杨；小青杨、帝国杨５１号、欧美杨６４。具高光合速率的昭林杨６号，受光量作用大，但受湿度、空气蒸汽压影响小，适应于具有干热天气的半干旱地区；而低光合类群的三个无性系则不同，其中欧美杨６４一直与光、湿度和蒸汽压的关系密切，均达显著水平；小青杨和帝国杨５１号对湿度、蒸汽压有着密切的相关。
The net photosynthetic rate (Pn) of eight poplar clones from different origins in Jianping semi-arid region of Liaoning Province reached significant and extremely significant differences. The net photosynthetic rate among clones could be divided into three types, : Zhao Lin Yang 6, the masses Yang, Chifeng Yang 34, Europe and the United States Yang 47; Populus; Populus, Empire Yang 51, Europe and the United States Yang 64. Zhao Lin Yang 6 with high photosynthetic rate was affected by the amount of light, but was less influenced by humidity and air vapor pressure, which was suitable for the semi-arid area with dry and hot weather. However, the three clones with low photosynthesis were different Europe and the United States Yang 64 has been closely related with light, humidity and vapor pressure, reached a significant level; Young Poplar and Empire Yang 51 on humidity, vapor pressure is closely related.