摘要
对胡桃楸、水曲柳、黄波罗、紫椴和白桦的光合特性进行研究的结果表明，随着幼叶成长和叶绿素含量的增加，各树种光合能力与硝酸还原酶活力也增加；晴天，白桦与水曲柳光合曲线呈双峰，其余３树种则呈单峰．阴雨数日转晴后，白桦与水曲柳光合曲线呈单岭，其余３树种呈双峰．阴天５个树种光合曲线均与光强曲线相似．通过实验证明，在幼叶成长过程中硝酸还原酶活力与光合速率呈正相关；各树种的光合速率除受主要因子光的影响外，空气相对湿度成为光能利用的限制因子．
The photosynthetic characteristics of Manchurian Walnun,Manchurica Ash,Amur Cock-tree,Amur Linden and Asian white Birch were studied in this paper.The results show that the chloro-phyll contents increase while young leaves grow and the ability of photosynthesis and the reductase ac-tivity of nitrate also increase.In sunny days,photosynthetic curves of Asian white Birch and ManchurianAsh are double humps ,other three species are single hump. In sunny days after raining,the photosyn-thetic curves of Asian white Birch and Manchurian Ash are single huinp,others are double hump.Incloudy days,the photosynthetic curves of five species are similar to light intensities curves. The testsprove that during the young leaves growing, the reductase activity of nitrate is interrelated with the pho-tosythetic rate,the air relative humility becomes ruling factor in utilizing light energy besides light influ-ence on photosynthetic rate of every species.
关键词
光合速率
叶绿素含量
硝酸还原酶活力
阔叶树
Photosynthetic rate,Chlorophyll content,Reductase ativity of nitrate,Broad-leaved trees
