摘要
湿地是温室气体氧化亚氮(N2O)的源或汇,研究湿地N2O排放通量的时空变化特性对探究N2O的排放活跃区及减小温室效应有着重要的意义。采用静态箱-气相色谱法对白洋淀湖泊湿地N2O排放通量的时空变化特性及其影响因素进行了初步研究,结果表明白洋淀湖泊湿地N2O的排放呈现明显的时空变化特性,夏季N2O的排放量最大,且湖滨带是其排放的活跃区;白洋淀湖泊湿地优势植被芦苇的生长状况影响N2O的产生与排放,其鲜质量增加量与N2O的排放通量呈负相关性;土壤含水率的变化与N2O的排放通量有着较好的相关性,土壤含水率升高,N2O的排放通量增加;白洋淀湖泊湿地水中亚硝态氮质量浓度与N2O的产生和排放关系密切,随着亚硝态氮质量浓度的增加N2O的排放通量呈对数增长。
It was very significant to study the space-time variation of N2O emission flux from wetland for exploring the active region and reducing the greenhouse effect as the wetland was a source or a sink of N2O emission. The space-time variation characteristics and the effect factors of N2O emission flux in Baiyangdian wetland had been studied by a static chamber-gas chromatograph technique in this paper. The results showed that the space-time variation of N2O emission flux was obvious in Baiyangdian wetland. The flux mostly occurred in summer and the littoral zone was the dominating area for N2O emission. The production and emission of N2O was affected by bulrush growth, whose biomass increase was negatively correlated with N2O emission flux. There was a good correlation between soil moisture and N2O emission flux which increased with the soil moisture increasing. The production and emission of N2O had also been affected by the concentration of nitrite nitrogen in water, and the relationship of them was logarithmic.
出处
《生态环境》
CSCD
北大核心
2008年第5期1732-1738,共7页
Ecology and Environmnet
基金
国家973项目(2006CB403403)
国家自然科学基金项目(50579076)
