Knowledge Management System of Northwest Institute of Plateau Biology, CAS
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
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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 | |
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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