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应用生态学报 ›› 1997, Vol. 8 ›› Issue (3): 235-239.

• 研究论文 • 上一篇    下一篇

固氮树种在混交林中的作用研究Ⅱ.固氮树木叶部N、P养分动态特征

何兴元, 张成刚, 杨思河, 陈玮, 张粤, 刘惠昌, 苏道岩   

  1. 中国科学院沈阳应用生态研究所, 沈阳 110015
  • 收稿日期:1997-04-07 修回日期:1997-05-13 出版日期:1997-05-25 发布日期:1997-05-25
  • 基金资助:

    中国科学院“八·五”重点资助项目(KS85-116)

Role of nitrogen-fixing trees in mixed forest Ⅱ. Seasonal variation patterns of N and P contents in leaves of nitrogen-fixing trees

He Xingyuan, Zhang Chenggang, Yang Sihe, Chen Wei, Zhang Yue, Liu Huichang, Su Daoyan   

  1. Institute of Applied Ecology, Academia Sinica, Shenyang 110015
  • Received:1997-04-07 Revised:1997-05-13 Online:1997-05-25 Published:1997-05-25

摘要: 研究了23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21~23%,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.

关键词: 固氮树种, N、P含量, 养分动态, 混交林, 铵盐, 硝酸盐, 同位素组成

Abstract: 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.

Key words: Nitrogen-fixing trees, N and P content, Nutrient dynamics, Mixed forest, isotopic composition, nitrate, ammonium