QQ客服 官方微博 反馈留言

	Plant species effects on methane emissions from freshwater marshes
	Ding, WX; Cai, ZC; Tsuruta, H
刊名	ATMOSPHERIC ENVIRONMENT
	2005-06-01
卷号	39期号:18页码:3199-3207
关键词	Carex lasiocarpa Carex meyeriana Deyeuxia angustifolia methane oxidation methane production plant mediated gas transport
ISSN号	1352-2310
DOI	10.1016/j.atmosenv.2005.02.022
通讯作者	Ding, WX(dr.dingweixin@163.com)
英文摘要	Wetland plants not only stimulate CH4 emissions from wetlands to the atmosphere by providing the gas conduit and releasing organic compounds through root exudation and debris to increase CH4 production, but also reduce CH4 emissions by delivering O-2 into the underground to accentuate CH4 oxidation in the rhizosphere. The capacity of the plants Carex lasiocarpa, Carex meyeriana and Deyeuxia angustifolia to transport CH4 from freshwater marshes in Sanjiang plain, China to the atmosphere was measured. Their integrated effects on dissolved porewater CH4 concentration and CH4 emission were studied by clipping plants just above the water surface. The amount and fraction of CH4 emissions via intact plants C. lasiocarpa, C meyeriana and D. angustifolia was 16.0, 20.8 and 8.0 mu g CH4 stem(-1)h(-1), and 73-82%, 75-86% and 28-31%, respectively, indicating that when CH4 is released by the diffusive rather than pressurized transport through the aerenchyma system, cyperaceous plants have a significantly higher gas transport capacity than gramineous plants. After plants were clipped 3 cm above the water surface, CH4 emissions and CH4 concentrations in the C lasiocarpa marsh with a standing water depth of similar to 20 cm increased significantly; only slight increases were measured in the C. meyeriana marsh with a standing water layer of similar to 15 cm. The redox potentials (E-h) in the vertical profiles of both marshes were further lowered after plants were clipped. These results suggest that apart from being a conduit for gas transport, C. lasiocarpa made a greater contribution to CH4 oxidation than CH4 production, whereas C meyeriana made nearly the same contribution to CH4 oxidation as to CH4 production. In contrast, a decrease in dissolved porewater CH4 concentration and a very limited increase in CH4 emission in the D. angustifolia marsh with a standing water depth of similar to 5 cm indicated that D. angustifolia might make a greater contribution to CH4 production than to CH4 oxidation. Thereafter, as the standing water depth and the capacity of plants to transport CH4 from wetlands increased, plant integrated effect of stimulating CH4 production by releasing root exudates and debris minus accentuating CH4 oxidation by excreting O-2 from roots not only decreased but also varied from increasing CH4 concentration for D. angustifolia to reducing CH4 concentration for C. lasiocarpa. The higher CH4 emission in the C lasiocarpa marsh than in the D. angustifolia marsh was due to the high CH4 transport capacity of C. lasiocarpa rather than the stimulating effect of C lasiocarpa on CH4 production. This finding suggests that when models are used for estimation of CH4 emissions from natural wetlands, difference in plant species effect on CH4 production and oxidation should be involved in. (c) 2005 Elsevier Ltd. All rights reserved.
收录类别	SCI
WOS关键词	RICE PADDIES ; DIEL VARIATION ; OXIDATION ; SOIL ; CH4 ; TRANSPORT ; ATMOSPHERE ; CAREX ; MACROPHYTES ; VEGETATION
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000230125000002
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558507
专题	南京土壤研究所
通讯作者	Ding, WX
作者单位	1.Natl Inst Agroenvironm Sci, Greenhouse Gas Emiss Team, Tsukuba, Ibaraki 3058604, Japan 2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Ding, WX,Cai, ZC,Tsuruta, H. Plant species effects on methane emissions from freshwater marshes[J]. ATMOSPHERIC ENVIRONMENT,2005,39(18):3199-3207.
APA	Ding, WX,Cai, ZC,&Tsuruta, H.(2005).Plant species effects on methane emissions from freshwater marshes.ATMOSPHERIC ENVIRONMENT,39(18),3199-3207.
MLA	Ding, WX,et al."Plant species effects on methane emissions from freshwater marshes".ATMOSPHERIC ENVIRONMENT 39.18(2005):3199-3207.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。