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	Diel methane emissions in stands of Spartina alterniflora and Suaeda salsa from a coastal salt marsh
	Zhang, Yaohong1,2; Ding, Weixin1
刊名	AQUATIC BOTANY
	2011-11-01
卷号	95期号:4页码:262-267
关键词	Coastal salt marsh Diel variation Methane emission Methane oxidation Spartina alterniflora Suaeda salsa
ISSN号	0304-3770
DOI	10.1016/j.aquabot.2011.08.005
通讯作者	Ding, Weixin(wxding@issas.ac.cn)
英文摘要	In this study, we aimed to understand the influence of plant type on the monthly variations of diel CH(4) fluxes from Spartina alterniflora and Suaeda salsa of coastal salt marshes at three growth stages (July, August and September). Dissolved CH(4) concentrations in porewater and sediment redox potentials were monitored, as were aboveground plant biomass and stem densities. CH(4) fluxes exhibited clear monthly variations and peaked in September in the S. alterniflora and S. salsa mesocosms. However, no discernible diel variation was observed in the CH(4) flux in the S. salsa mesocosm, probably due to its weak gas transport capacity. By contrast, notable diel variations of CH(4) flux with the peak of 1.42 and 3.67 mg CH(4) m(-2) h(-1) at 12:00 and the lowest of 0.75 and 2.11 mg CH(4) m(-2) h(-1) at 3:00 or 6:00 were observed in the S. alterniflora mesocosm on 11 August and 11 September, respectively, but not in July mainly due to low plant biomass masking diel variations in the porewater CH(4) concentration. The ratios of the maximum flux to minimum flux over the course of the day in the S. alterniflora mesocosm on 10 July, 11 August and 11 September were 1.28, 1.89 and 1.76, respectively, and corresponding values for porewater CH(4) concentration were 1.31, 1.39 and 1.17, respectively. CH(4) flux significantly correlated with CH(4) concentration in porewater, and both were significantly related to air temperature. These findings indicate that CH(4) production and CH(4) flux at the middle growth stage (August) exhibited greater responses to changes in air temperature, which in turn induced the higher diel variation. The higher diel cycle for CH(4) flux in August than in September was likely due to the higher proportion of CH(4) oxidized during diffusion within the aerenchyma system. Our results suggest that the extent of diel variations in CH(4) flux may have depended on the gas transport capacity of plants, and the highest diel variation occurred at the middle growth stage. (C) 2011 Elsevier B.V. All rights reserved.
收录类别	SCI
WOS关键词	CONVECTIVE GAS-FLOW ; PHRAGMITES-AUSTRALIS ; SOIL-TEMPERATURE ; DIURNAL-VARIATION ; EDDY COVARIANCE ; RICE PLANTS ; WATER-TABLE ; BOREAL LAKE ; TRANSPORT ; MACROPHYTES
WOS研究方向	Plant Sciences ; Marine & Freshwater Biology
WOS类目	Plant Sciences ; Marine & Freshwater Biology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000297879300004
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2559049
专题	南京土壤研究所
通讯作者	Ding, Weixin
作者单位	1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China 2.Nanjing Univ Informat Sci & Technol, Nanjing 210044, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yaohong,Ding, Weixin. Diel methane emissions in stands of Spartina alterniflora and Suaeda salsa from a coastal salt marsh[J]. AQUATIC BOTANY,2011,95(4):262-267.
APA	Zhang, Yaohong,&Ding, Weixin.(2011).Diel methane emissions in stands of Spartina alterniflora and Suaeda salsa from a coastal salt marsh.AQUATIC BOTANY,95(4),262-267.
MLA	Zhang, Yaohong,et al."Diel methane emissions in stands of Spartina alterniflora and Suaeda salsa from a coastal salt marsh".AQUATIC BOTANY 95.4(2011):262-267.

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