生态与农村环境学报Issue(6)：736-743,8.
不同水生植物对富营养化水体释放气体的影响
Effect of Aquatic Plants on Emission of Gases From Eutrophic Water
摘要
Abstract
Denitrification and emission of greenhouse gases and oxygen are all important biochemical processes occurring in aquatic ecosystems. To define extent of the impact of aquatic plants, relative to type, on these processes, dynamics of N2 , CH4 , O2 , CO2 and N2 O emissions from eutrophic waters in Caohai of Lake Dianchi, rank with emergent plants ( Acorus calamus) , floating⁃leaved plants ( Nymhaea tetragona, Nelumbo nucifera) , floating plants ( Eichhornia crassipes) and submerged plants ( Myriophyllum verticillatum, Hydrilla verticillata) and in control ( waters without plants) were stud⁃ied in July and August, 2012. Gases released from the waters were in⁃situ collected using a self⁃developed bubble trapping device, while water temperature, dissolved oxygen (DO), oxidative redox potential (ORP) and pH were also measured. Results show that the gas emitted from the waters with or without aquatic plants, were composed mostly of N2 , CH4 and O2 , and the rest of CO2 and N2 O. The submerged plants obviously improved O2 releasing process via photosynthesis, resul⁃ting in higher gas emission rate and higher emission fluxes of various fractions of gases. The leaves of Nymhaea tetragona, Nelumbo nucifera, and Eichhornia crassipes created shadow over the water surface, thus decreasing photosynthetic capacity of algae in the water, and consequently the gas emission rate of the water, with its median being even lower than that in the control. Moreover, the shadow also reduced emission fluxes of various fractions of gases. No significant difference was found in CH4 concentration in emitted gas between the experimental plots, while the concentration of N2 in the gas emitted from the waters grown with Acorus calamus or Nymhaea tetragona was significantly higher than that from the control. The study provides a new method and idea for studying how different aquatic plants affect the gas releasing process in waters.关键词
水生植物/反硝化/温室气体/富营养化水体Key words
aquatic plant/denitrification/greenhouse gas/eutrophic waters分类
资源环境引用本文复制引用
张力,张振华,高岩,严少华..不同水生植物对富营养化水体释放气体的影响[J].生态与农村环境学报,2014,(6):736-743,8.基金项目
国家自然科学基金（31100373）；973计划前期研究专项（2012CD426503）；江苏省农业科技自主创新基金〔CX（13）5048〕 （）
