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应用生态学报 ›› 1996, Vol. 7 ›› Issue (s1): 83-87.

• 研究论文 • 上一篇    下一篇

北方稻田生态系统研究Ⅱ.稻萍结合系统细绿萍共生固N量研究

苏凤岩, 李维光, 闻大中, 徐卿德, 林建群   

  1. 中国科学院沈阳应用生态研究所, 沈阳110015
  • 收稿日期:1996-01-12 修回日期:1996-05-22 出版日期:1996-12-25 发布日期:1996-12-25
  • 基金资助:

    中国科学院"八五"重大项目

Rice field ecosystems in northern China Ⅱ. Study of symbiotic nitrogen fixation of Azolla in rice-Azolla combination systems

Su Fengyan, Li Weiguang, Wen Dazhong, Xu Qingde, Lin Jianqun   

  1. Institute of Applied Ecology, Academia Sinica, Shenyang 110015
  • Received:1996-01-12 Revised:1996-05-22 Online:1996-12-25 Published:1996-12-25

摘要: 对稻萍结合系统细绿萍共生固N量研究表明,萍的固N力在整个生长季不同时期有所变化.最高固N率出现在6月初,萍固N量随其接种量和水稻行距增加而增加.50~10cm宽窄行交替的水稻行距和1500kg·hm-2的萍接种量的稻萍结合系统的总固N量为107.1kg·hm-2,而30cm等行距的325kg·hm-2的萍接种量的稻-萍结合系统的总固N量仅为36.0kg·hm-2.

关键词: 单季稻, 水田生态系统, 稻萍结合, 土壤孔隙度, 土壤容重, 核桃, 间作, 农林复合系统, 小麦

Abstract: The study on the quantities of symbiotic nitrogen fixation of Azolla filiculoides in rice-Azolla combination systems shows that the nitrogen fixation ability of Azolla varied with different periods of growing season. The highest nitrogen fixation rate is occured in early June.Its total quantity of nitrogen fixation is increased with increasing Azolla inoculation rates and rice row distances. Total quantity of nitrogen fixation of Azolla is 107.1 kg·hm-2 in the system with alternating row rice planting of 50 and 10cm and an Azolla inoculation rate of 1500 kg·hm-2, and is 36.0 kg·hm-2 in the system with equal row riceplanting of 30cm and an Azolla inoculation rate of 325 kg·hm-2.

Key words: Single-cropping rice, Rice field ecosystem, Rice-Azolla combination, wheat, soil porosity, intercropping, walnut tree, agroforestry system, soil bulk density