Methane emissions from different vegetation zones in a Qinghai-Tibetan Plateau wetland

	Methane emissions from different vegetation zones in a Qinghai-Tibetan Plateau wetland
	Hirota, M ; Tang, YH ; Hu, QW ; Hirata, S ; Kato, T ; Mo, WH ; Cao, GM ; Mariko, S
刊名	soil biology & biochemistry
	2004-05-01
卷号	36 期号:5 页码:737-748
关键词	methane flux zonal vegetation growth form water depth alpine wetland Qinghai-Tibetan Plateau
合作状况	其它
中文摘要	we measured methane (ch4) emissions in the luanhaizi wetland, a typical alpine wetland on the qinghai-tibetan plateau, china, during the plant growth season (early july to mid-september) in 2002. our aim was to quantify the spatial and temporal variation of ch4 flux and to elucidate key factors in this variation. static chamber measurements of ch4 flux were made in four vegetation zones along a gradient of water depth. there were three emergent-plant zones (hippuris-dominated; scirpus-dominated; and carex-dominated) and one submerged-plant zone (potamogeton-dominated). the smallest ch4 flux (seasonal mean = 33.1 mg ch4 m(-2) d(-1)) was, observed in the potamogeton-dominated zone, which occupied about 74% of the total area of the wetland. the greatest ch4 flux (seasonal mean = 214 mg ch4 m(-2) d(-1)) was observed in the hippuris-dominated zone, in the second-deepest water area. ch4 flux from three zones (excluding the carex-dominated zone) showed a marked diurnal change and decreased dramatically under dark conditions. light intensity had a major influence on the temporal variation in ch4 flux, at least in three of the zones. methane fluxes from all zones increased during the growing season with increasing aboveground biomass. ch4 flux from the scirpus-dominated zone was significantly lower than in the other emergent-plant zones despite the large biomass, because the root and rhizome intake ports for ch4 transport in the dominant species were distributed in shallower and more oxidative soil than occupied in the other zones. spatial and temporal variation in ch4 flux from the alpine wetland was determined by the vegetation zone. among the dominant species in each zone, there were variations in the density and biomass of shoots, gas-transport system, and root-rhizome architecture. the ch4 flux from a typical alpine wetland on the qinghai-tibetan plateau was as high as those of other boreal and alpine wetlands. (c) 2004 elsevier ltd. all rights reserved.
英文摘要	we measured methane (ch4) emissions in the luanhaizi wetland, a typical alpine wetland on the qinghai-tibetan plateau, china, during the plant growth season (early july to mid-september) in 2002. our aim was to quantify the spatial and temporal variation of ch4 flux and to elucidate key factors in this variation. static chamber measurements of ch4 flux were made in four vegetation zones along a gradient of water depth. there were three emergent-plant zones (hippuris-dominated; scirpus-dominated; and carex-dominated) and one submerged-plant zone (potamogeton-dominated). the smallest ch4 flux (seasonal mean = 33.1 mg ch4 m(-2) d(-1)) was, observed in the potamogeton-dominated zone, which occupied about 74% of the total area of the wetland. the greatest ch4 flux (seasonal mean = 214 mg ch4 m(-2) d(-1)) was observed in the hippuris-dominated zone, in the second-deepest water area. ch4 flux from three zones (excluding the carex-dominated zone) showed a marked diurnal change and decreased dramatically under dark conditions. light intensity had a major influence on the temporal variation in ch4 flux, at least in three of the zones. methane fluxes from all zones increased during the growing season with increasing aboveground biomass. ch4 flux from the scirpus-dominated zone was significantly lower than in the other emergent-plant zones despite the large biomass, because the root and rhizome intake ports for ch4 transport in the dominant species were distributed in shallower and more oxidative soil than occupied in the other zones. spatial and temporal variation in ch4 flux from the alpine wetland was determined by the vegetation zone. among the dominant species in each zone, there were variations in the density and biomass of shoots, gas-transport system, and root-rhizome architecture. the ch4 flux from a typical alpine wetland on the qinghai-tibetan plateau was as high as those of other boreal and alpine wetlands. (c) 2004 elsevier ltd. all rights reserved.
学科主题	生物科学
WOS标题词	science & technology ; life sciences & biomedicine
类目[WOS]	soil science
研究领域[WOS]	agriculture
关键词[WOS]	convective gas-flow ; rice plants ; phragmites-australis ; seasonal-variation ; vascular plants ; water-table ; ch4 ; transport ; peatlands ; rhizosphere
收录类别	SCI
语种	英语
WOS记录号	WOS:000220840700001
公开日期	2009-12-09
内容类型	期刊论文
源URL	[http://ir.nwipb.ac.cn/handle/363003/1396]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
作者单位	1.Univ Tsukuba, Doctoral Program Biol Sci, Tsukuba, Ibaraki 3058572, Japan 2.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan 3.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China 4.Univ Tsukuba, Grad Sch Life & Environm Sci, Tsukuba, Ibaraki 3058572, Japan 5.Univ Tsukuba, Inst Biol Sci, Tsukuba, Ibaraki 3058572, Japan
推荐引用方式 GB/T 7714	Hirota, M,Tang, YH,Hu, QW,et al. Methane emissions from different vegetation zones in a Qinghai-Tibetan Plateau wetland[J]. soil biology & biochemistry,2004,36(5):737-748.
APA	Hirota, M.,Tang, YH.,Hu, QW.,Hirata, S.,Kato, T.,...&Mariko, S.(2004).Methane emissions from different vegetation zones in a Qinghai-Tibetan Plateau wetland.soil biology & biochemistry,36(5),737-748.
MLA	Hirota, M,et al."Methane emissions from different vegetation zones in a Qinghai-Tibetan Plateau wetland".soil biology & biochemistry 36.5(2004):737-748.