Depression of net ecosystem CO2 exchange in semi-arid Leymus chinensis steppe and alpine shrub

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	Depression of net ecosystem CO2 exchange in semi-arid Leymus chinensis steppe and alpine shrub
	Fu, Yu-Ling ; Yu, Gui-Rui ; Sun, Xiao-Min ; Li, Ying-Nian ; Wen, Xue-Fa ; Zhang, Lei-Ming ; Li, Zheng-Quan ; Zhao, Liang ; Hao, Yan-Bin
	2006-04-14
发表期刊	AGRICULTURAL AND FOREST METEOROLOGY
卷号	137 期号:3-4 页码:234-244
文章类型	Article
摘要	Uptake and release of carbon in grassland ecosystems is very critical to the global carbon balance and carbon storage. In this study, the dynamics of net ecosystem CO2 exchange (FNEE) of two grassland ecosystems were observed continuously using the eddy covariance technique during the growing season of 2003. One is the alpine shrub on the Tibet Plateau, and the other is the sem-arid Leymus chinensis steppe in Inner Mongolia of China. It was found that the FNEE of both ecosystems was significantly depressed under high solar radiation. Comprehensive analysis indicates that the depression of FNEE in the L. chinensis steppe was the results of decreased plant photosynthesis and increased ecosystem respiration (R-eco) under high temperature. Soil water stress in addition to the high atmospheric demand under the strong radiation was the primary factor limiting the stomatal conductance. In contrast, the depression of FNEE in the alpine shrub was closely related to the effects of temperature on both photosynthesis and ecosystem respiration, coupled with the reduction of plant photosynthesis due to partial stomatal closure under high temperature at mid-day. The R,c of the alpine shrub was sensitive to soil temperature during high turbulence (u* > 0.2 m s(-1)) but its FNEE decreased markedly when the temperature was higher than the optimal value of about 12 degrees C. Such low optimal temperature contrasted the optimal value (about 20 degrees C) for the steppe, and was likely due to the acclimation of most alpine plants to the long-term low temperature on the Tibet Plateau. We inferred that water stress was the primary factor causing depression of the FNEE in the semi-arid steppe ecosystem, while relative high temperature under strong solar radiation was the main reason for the decrease of FNEE in the alpine shrub. This study implies that different grassland ecosystems may respond differently to climate change in the future. (c) 2006 Elsevier B.V All rights reserved.; Uptake and release of carbon in grassland ecosystems is very critical to the global carbon balance and carbon storage. In this study, the dynamics of net ecosystem CO2 exchange (FNEE) of two grassland ecosystems were observed continuously using the eddy covariance technique during the growing season of 2003. One is the alpine shrub on the Tibet Plateau, and the other is the sem-arid Leymus chinensis steppe in Inner Mongolia of China. It was found that the FNEE of both ecosystems was significantly depressed under high solar radiation. Comprehensive analysis indicates that the depression of FNEE in the L. chinensis steppe was the results of decreased plant photosynthesis and increased ecosystem respiration (R-eco) under high temperature. Soil water stress in addition to the high atmospheric demand under the strong radiation was the primary factor limiting the stomatal conductance. In contrast, the depression of FNEE in the alpine shrub was closely related to the effects of temperature on both photosynthesis and ecosystem respiration, coupled with the reduction of plant photosynthesis due to partial stomatal closure under high temperature at mid-day. The R,c of the alpine shrub was sensitive to soil temperature during high turbulence (u* > 0.2 m s(-1)) but its FNEE decreased markedly when the temperature was higher than the optimal value of about 12 degrees C. Such low optimal temperature contrasted the optimal value (about 20 degrees C) for the steppe, and was likely due to the acclimation of most alpine plants to the long-term low temperature on the Tibet Plateau. We inferred that water stress was the primary factor causing depression of the FNEE in the semi-arid steppe ecosystem, while relative high temperature under strong solar radiation was the main reason for the decrease of FNEE in the alpine shrub. This study implies that different grassland ecosystems may respond differently to climate change in the future. (c) 2006 Elsevier B.V All rights reserved.
关键词	Net Ecosystem Co2 Exchange (F-nee) Depression Leymus Chinensis Steppe Alpine Shrub High Radiation Water Stress
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
学科领域	林业
关键词[WOS]	STOMATAL CONDUCTANCE ; SOIL RESPIRATION ; CARBON-DIOXIDE ; PHOTOSYNTHESIS ; TEMPERATURE ; WATER ; PHOTOINHIBITION ; MODEL ; TRANSPIRATION ; DEPENDENCE
收录类别	SCI
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000240070700011
引用统计	被引频次：97[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1322
专题	中国科学院西北高原生物研究所
作者单位	1.Acad Sinica, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100093, Peoples R China 4.Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Fu, Yu-Ling,Yu, Gui-Rui,Sun, Xiao-Min,et al. Depression of net ecosystem CO2 exchange in semi-arid Leymus chinensis steppe and alpine shrub[J]. AGRICULTURAL AND FOREST METEOROLOGY,2006,137(3-4):234-244.
APA	Fu, Yu-Ling.,Yu, Gui-Rui.,Sun, Xiao-Min.,Li, Ying-Nian.,Wen, Xue-Fa.,...&Hao, Yan-Bin.(2006).Depression of net ecosystem CO2 exchange in semi-arid Leymus chinensis steppe and alpine shrub.AGRICULTURAL AND FOREST METEOROLOGY,137(3-4),234-244.
MLA	Fu, Yu-Ling,et al."Depression of net ecosystem CO2 exchange in semi-arid Leymus chinensis steppe and alpine shrub".AGRICULTURAL AND FOREST METEOROLOGY 137.3-4(2006):234-244.

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