植物生态学报 ›› 1990, Vol. 14 ›› Issue (2): 160-164.

• 论文 • 上一篇    下一篇

攀枝花苏铁(Cycas panzhihuaensis)的根瘤和固氮作用

刘国凡,邓廷秀,周林,杨思源   

  • 发布日期:1990-02-10
  • 通讯作者: 刘国凡

The root nodules and the nitrogen fixation property of the Cycas Panzhihuaensis

Liu Guo-fan Deng Ting-xiu Zhou Lin Yang Si-yuna   

  • Published:1990-02-10
  • Contact: Tu Yu-lin

摘要: 分布在南亚热带金沙江干热河谷的攀枝花苏铁,普遍受蓝细菌侵染形成特殊的多级分枝珊瑚状根瘤簇。当年生树苗活瘤重可达8克/株,100年生370克/株。固氮活性在秋季一般为1.8—11.1μmol C2H4/g·f·w·h-1,它明显受光照和湿度影响,昼夜动态是白天活性明显比夜间高。苏铁固氮量从0.64—18.69毫克/株·小时,它在生态系统的氮循环中起良好作用。

Abstract: The cycas distributed in the dry-hot inshajiang river valley in the south-subtropical region of China,infected by the cyanobacteria,form especial coral-like nodule clusters with multiply branches. The nodules are most numerous within 10cm below the soil surface. The living nodules of current seedlings amounted to 8 g per plant and those of over 100 year plants averaged 370 g. The nitrogen fixation activity is usually from 1.8 to 11.1 μmol/g·f·w·h-1 in the autumn, and is obviously influenced by light and soil moisture, Daily variation of N2-fixing activity has shown that it is mhcu higher in daytime than at night. Nitrogen fixation amount for the cycas varied from 0.64 to 18.68 mg/plant·h-1.This suggests that it may play a certain role in the nitrogen cycle of