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生态学杂志 ›› 1984, Vol. ›› Issue (1): 10-13.

• 研究报告 • 上一篇    下一篇

东北天然林内赤杨根瘤的固氮作用与生态条件

杨思河, 黄家彬, 林继惠, 刘惠昌   

  1. 中国科学院林业土壤研究所
  • 收稿日期:1982-12-20 出版日期:1984-02-10

NITROGEN FIXATION BY NODULES OF ALDER AND ECOLOGICAL CONDITION IN NATURAL FORESTS OF NORTHEASTERN CHINA

Yang Sihe, Huang Jiabin, Lin Jihui, Liu Huichang   

  1. Institute of Forestry and Soil Science, Academia Sinica
  • Received:1982-12-20 Online:1984-02-10

Abstract: Alnus mandshurica(Call.) Hand.-Mazz. and A. sibirica var. hisruta(Turez.) Koidz. are widely distributed in forest regions of northeastern China as major non-leguminous nodulated tree species with N2-fixation. This paper summarizes the results of the research on effects of ecological factors on N2-fixation of alder nodules. The results show that sufficient light condition is essential in raising N2-fixing capability of the two species. The level of acetylene reduction of nodules partly depends on photosynthesis of the plant. The peak of diurnal course in acetylene reduction appears at 13: 00 hr. after the appearance of higher photosynthetic rate in early morning. The lower capability in N2-fixation by A. mandshurica growing at high altitude is due to the lower temperature besides genetic factors.