叶杨

华山松&响叶杨（6∶4）混交林林地土壤有机质、速效磷、速效钾、pH值比华山松纯林林地分别大15.99%、10.84%、7.69%、12.5%，提高了土壤的肥力。

The organic matter , the available P , the available K , pH of mixed forest ( 6 ∶ 4 ) were 15.99 % , 10.84 % , 7.69 % , 12.5 % more than those of P.armandi pure forest , and improved the soil fertility .

在小溪河床附近，有时能发现三角叶杨。

Close to streambeds , cottonwoods can sometimes be found .

没人会记得它们埋葬在这里，尽管三角叶杨、柳树和棕榈树的根茎或许偶尔会发现它们的存在。

No memorial will mark their burial , though the roots of cottonwoods , willows , and palms may occasionally make note of their presence .

白木树如美国鹅掌揪、椴、三角叶杨等各种落叶树人为去叶对紫椴幼树叶片净光合速率的影响

Any of various deciduous trees such as the tulip tree , basswood , or cottonwood . Effect of Artificial Defoliation on Leaf Net Photosynthetic Rate of Tilia amurensis Young Trees

以玉米叶和杨树叶为天然纤维素原料，水解糖化率分别达到862%和560%。

To the maize leaves and poplar leaves , the hydrolysis efficiency could reach to 86 2 % and 56 0 % , respectively .