<正>分析了欧美杨（ＰｏｐｕｌｕｓｘｅｕｒａｍｅｒｉｃａｎａｃｖⅠ２１４）和美洲黑杨（Ｐ．ｄｅｌｔｏｉｄｅｓｃｖＨａｒｖａｒｄｅｘⅠ６３／５１）树叶在不同生长季节的化学成分。结果表明，在相同的采集季节，二种树叶的化学成分相差不大，都含有较多的蛋白质、氨基酸及丰富的无机元素。但是，各种化学成分均随采集季节的不同而变化。其中，蛋白质、氨基酸的含量随季节变化较大，其他成分变化较小。两种杨树叶蛋白质和氨基酸的含量接近或高于一些农、副产品，可以代替粮食等作为畜、禽饲料。

Chemical compositions in leaves of Populus xeuramericana cv 214 and P.deltoides cv Harvard ex 63/51 have been studied.The results show that the chemical compositions of leaves abovementioned two species of popler are not different in the same growing period.Its content all are of much protain,amino acids and rich inorganic elements.But the compositions are different in different seasonal leaves gathered.The content of protainand amino acids have bigger change,changes of other compositions are less.The content of protein and amino acid in leaves of abovementioned two species of poplar are close to or higher than some fodder material. So the abovementioned leaves can be used as fodder of livestocks and poultry.