摘要
研究了 2 3种固氮与非固氮树种叶部N、P含量的季节变化、输出率以及叶片衰老过程中N、P的输出过程 .结果表明 ,供试树种叶部N、P含量均存在着明显的季节变化 ,平均变化率为 2 1～ 2 3% ,最大变化率出现在叶片衰老期 .在衰老期内不同树种表现出不同的N、P动态特征 .固氮树种表现出低输出率 ,落叶中N含量是非固氮树种的 1 .6～ 3.7倍 .固氮树种生长季叶部N含量在 2 .5%左右 .
The seasonal variation and export rate of N and P contents in leaves and the export course of N and P in decrepit leaves of 23 nitrogen fixing and non nitrogen fixing tree species were studied. The results showed that in the leaves of all tested trees, there was an obvious seasonal variation of N and P contents,their average variation rate was 21～23%,and the maximum appeared at decrepit stage. During this stage, the dynamic character of N and P in leaves was different between nitrogen fixing and non nitrogen fixing trees. The former displayed a low export rate, and the N content in their fallen leaves was 1.6～3.7 times higher than the later. The N content in the leaves of nitrogen fixing trees was about 2.5% in growing seasons.
出处
《应用生态学报》
CAS
CSCD
1997年第3期235-239,共5页
Chinese Journal of Applied Ecology
基金
中国科学院"八.五"重点资助项目!(KS 85-1 1 6)
关键词
森林生态学
固氮树种
养分动态
混交林
氮
磷
Nitrogen fixing trees, N and P content, Nutrient dynamics, Mixed forest.
