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题名: Effects of vegetation control on ecosystem water use efficiency within and among four grassland ecosystems in China
作者: Hu, Zhongmin1, 2; Yu, Guirui1; Fu, Yuling1; Sun, Xiaomin1; Li, Yingnian3; Shi, Peili1; Wangw, Yanfen2; Zheng, Zemei1, 2
刊名: GLOBAL CHANGE BIOLOGY
出版日期: 2008-07-01
卷号: 14, 期号:7, 页码:1609-1619
关键词: alpine grassland ; ChinaFLUX ; eddy covariance ; evapotranspiration ; leaf area index ; soil evaporation ; temperate grassland ; transpiration
学科分类: 生物科学
文章类型: Article
中文摘要: Through 2-3-year (2003-2005) continuous eddy covariance measurements of carbon dioxide and water vapor fluxes, we examined the seasonal, inter-annual, and inter-ecosystem variations in the ecosystem-level water use efficiency (WUE, defined as the ratio of gross primary production, GPP, to evapotranspiration, ET) at four Chinese grassland ecosystems in the Qinghai-Tibet Plateau and North China. Representing the most prevalent grassland types in China, the four ecosystems are an alpine swamp meadow ecosystem, an alpine shrub-meadow ecosystem, an alpine meadow-steppe ecosystem, and a temperate steppe ecosystem, which illustrate a water availability gradient and thus provide us an opportunity to quantify environmental and biological controls on ecosystem WUE at different spatiotemporal scales. Seasonally, WUE tracked closely with GPP at the four ecosystems, being low at the beginning and the end of the growing seasons and high during the active periods of plant growth. Such consistent correspondence between WUE and GPP suggested that photosynthetic processes were the dominant regulator of the seasonal variations in WUE. Further investigation indicated that the regulations were mainly due to the effect of leaf area index (LAI) on carbon assimilation and on the ratio of transpiration to ET (T/ET). Besides, except for the swamp meadow, LAI also controlled the year-to-year and site-to-site variations in WUE in the same way, resulting in the years or sites with high productivity being accompanied by high WUE. The general good correlation between LAI and ecosystem WUE indicates that it may be possible to predict grassland ecosystem WUE simply with LAI. Our results also imply that climate change-induced shifts in vegetation structure, and consequently LAI may have a significant impact on the relationship between ecosystem carbon and water cycles in grasslands.
英文摘要: Through 2-3-year (2003-2005) continuous eddy covariance measurements of carbon dioxide and water vapor fluxes, we examined the seasonal, inter-annual, and inter-ecosystem variations in the ecosystem-level water use efficiency (WUE, defined as the ratio of gross primary production, GPP, to evapotranspiration, ET) at four Chinese grassland ecosystems in the Qinghai-Tibet Plateau and North China. Representing the most prevalent grassland types in China, the four ecosystems are an alpine swamp meadow ecosystem, an alpine shrub-meadow ecosystem, an alpine meadow-steppe ecosystem, and a temperate steppe ecosystem, which illustrate a water availability gradient and thus provide us an opportunity to quantify environmental and biological controls on ecosystem WUE at different spatiotemporal scales. Seasonally, WUE tracked closely with GPP at the four ecosystems, being low at the beginning and the end of the growing seasons and high during the active periods of plant growth. Such consistent correspondence between WUE and GPP suggested that photosynthetic processes were the dominant regulator of the seasonal variations in WUE. Further investigation indicated that the regulations were mainly due to the effect of leaf area index (LAI) on carbon assimilation and on the ratio of transpiration to ET (T/ET). Besides, except for the swamp meadow, LAI also controlled the year-to-year and site-to-site variations in WUE in the same way, resulting in the years or sites with high productivity being accompanied by high WUE. The general good correlation between LAI and ecosystem WUE indicates that it may be possible to predict grassland ecosystem WUE simply with LAI. Our results also imply that climate change-induced shifts in vegetation structure, and consequently LAI may have a significant impact on the relationship between ecosystem carbon and water cycles in grasslands.
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Biodiversity Conservation ; Ecology ; Environmental Sciences
研究领域[WOS]: Biodiversity & Conservation ; Environmental Sciences & Ecology
关键词[WOS]: LEYMUS-CHINENSIS STEPPE ; CARBON-DIOXIDE ; CO2 EXCHANGE ; TIBETAN PLATEAU ; VAPOR EXCHANGE ; INNER-MONGOLIA ; EVAPORATION ; FOREST ; EVAPOTRANSPIRATION ; PHOTOSYNTHESIS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000256446300014
Citation statistics:
内容类型: 期刊论文
URI标识: http://210.75.249.4/handle/363003/1213
Appears in Collections:中国科学院西北高原生物研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Synth Res Ctr Chinese Ecosyst Res Network, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
3.Chinese Acad Sci, NW Inst Plateau Biol, Xining 810001, Peoples R China

Recommended Citation:
Hu Zhongmin,Yu Guirui,Fu Yuling,Sun Xiaomin,Li Yingnian,Shi, Peili, Wangw Yanfen, Zheng Zemei.Effects of vegetation control on ecosystem water use efficiency within and among four grassland ecosystems in China. GLOBAL CHANGE BIOLOGY,2008,14(7):1609-1619
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