常绿和落叶阔叶树叶中N和P的变化及转移  

Changes in Nitrogen and Phosphorus and Their Retranslocation in Leaves of Evergreen and Deciduous Broadleaved Trees

作　　者：薛立[1] 罗山[1] 

机构地区：[1]华南农业大学,广东广州510642

出　　处：《林业科学研究》2003年第2期166-170,共5页Forest Research

基　　金：国家教委留学回国人员启动基金项目([1999]363)资助

摘　　要：从叶完全展开到生长季结束对常绿阔叶树种铁冬青、红楠和海桐及落叶阔叶树种日本朴、银杏和木叶的N和P浓度进行了定期测定。结果表明,常绿阔叶树种新叶的N和P浓度从5—7月急剧下降,然后小幅波动,而老叶的N和P浓度变化缓慢。落叶阔叶树种的N和P浓度随着季节的推移而明显下降。大多数树种的P转移率大于N转移率。常绿阔叶树种的N和P的转移率大于落叶阔叶树种。The leaves of evergreen broadleaved tree species Ilex rotunda, Machilus thunbergii, Pittosporum tobira and deciduous broadleaved tree species Celtis sinensis, Ginkgo biloba, Cornus florida were collected from the time of full leaf expansion to the end of growing season. The N and P concentrations in new and old leaves of evergreen broadleaved species dropped rapidly from May to July, and then changed slightly, and the changes of N and P concentrations in old leaves were small. The N and P concentrations in leaves of deciduous broadleaved species gradually decreased with time. P retranslocation efficiency for most tree species was greater than their N retranslocation efficiency. N and P retranslocation efficiencies in the evergreen species were higher than that in the deciduous species.

关 键 词：常绿阔叶树种 落叶阔叶树种 N P 季节变化 养分转移 

分 类 号：S718.5[农业科学—林学]