文章基本信息

标题：Plant-Mediated CH 4 Emission from a Phragmites-Dominated Wetland in an Arid Region, China
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作者：Xiaonan Duan ; Xiaoke Wang ; Zhiyun Ouyang 等
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：2006
卷号：21
期号：1
页码：139-145
DOI：10.1080/02705060.2006.9664106
出版社：Taylor & Francis
摘要：We investigated the effects of vascular plants on methane emissions from Wuliangsu Lake, a wetland in an arid region of northwestern China. Under natural conditions in early June and late July, average CH 4 fluxes were respectively 16.3±4.3 and 19.3±6.0 mg m -2 h -1 . Whereas, shading treatments, which eliminated direct sunlight to plants, resulted in lower CH 4 emission (8.2±1.9 and 10.2±2.6 mg m -2 h -1 for the two periods). When the culms were cut below the water surface, the fraction of CH 4 emissions was about 18% and 15% of that of natural control systems in early June and late July, respectively. Our findings indicated that the photosynthesis of reed had a positive influence on the process of methane emission; however, effects on production and transport outweighed oxidation. Of the carbon fixed by photosynthesis, only 4.7% was returned to the atmosphere as CH 4 .