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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
2004-05-01
Source PublicationSOIL BIOLOGY & BIOCHEMISTRY
Volume36Issue:5Pages:737-748
SubtypeArticle
AbstractWe 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.; 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.
KeywordMethane Flux Zonal Vegetation Growth Form Water Depth Alpine Wetland Qinghai-tibetan Plateau
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Subject Area生物科学
WOS KeywordCONVECTIVE GAS-FLOW ; RICE PLANTS ; PHRAGMITES-AUSTRALIS ; SEASONAL-VARIATION ; VASCULAR PLANTS ; WATER-TABLE ; CH4 ; TRANSPORT ; PEATLANDS ; RHIZOSPHERE
Indexed BySCI
Language英语
WOS Research AreaAgriculture
WOS SubjectSoil Science
WOS IDWOS:000220840700001
Citation statistics
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/1396
Collection中国科学院西北高原生物研究所
Affiliation1.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
Recommended Citation
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.
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