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.
出处
《林业科学研究》
CSCD
北大核心
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
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
evergreen broadleaved tree
deciduous broadleaved tree
nitrogen
phosphorus
seasonal change
retranslocation
