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Predominance of Precipitation and Temperature Controls on Ecosystem CO2 Exchange in Zoige Alpine Wetlands of Southwest China

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Abstract

Net ecosystem exchange (NEE) of carbon dioxide (CO2) was measured at Zoige wetland using the eddy covariance technique. Analysis of CO2 fluxes in two years showed Zoige wetland was a net CO2 sink of −47.1 and −79.7 g C m−2 a−1 in 2008 and 2009, respectively. The peak NEE value was −0.54 mg CO2 m−2 s−1 (the negative value signifies net ecosystem carbon gain from air). The maximal daily integrated NEE was −4.1 g C m−2 d−1 during the peak growth season (from July to August). Gross ecosystem photosynthesis was likely more variable than ecosystem respiration at both seasonal and interannual timescales in this wetland. Our data strongly suggested that the combination of precipitation and temperature, as well as phenological stage of vegetation, controlled the dynamics of ecosystem carbon gain, even in drought years. Therefore, an accurate representation of these parameters in climate models is critical to the success of forecasting carbon budgets of alpine wetlands.

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Acknowledgments

Financial support was subsidized by the National Natural Science Foundation (Grant No. 30590380, 90711001, 30870447) and the National Key Basic Research Program (NKBRP) (Grant No. 2010CB833500). We thank for two anonymous reviewer’s valuable suggestion.

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Authors and Affiliations

  1. College of Life Sciences, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China

    Yan Bin Hao, Xiao Yong Cui & Yan Fen Wang

  2. College of Resource and Environment, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China

    Xiao Ming Kang

  3. Institute of Environment and Sustainable Development in Agriculture CAAS, Beijing, 100081, China

    Xu Rong Mei

  4. Center for Ecological Studies, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China

    Ning Wu, Peng Luo & Dan Zhu

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  1. Yan Bin Hao
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  2. Xiao Yong Cui
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  3. Yan Fen Wang
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  5. Xiao Ming Kang
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  7. Peng Luo
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  8. Dan Zhu
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Correspondence to Yan Fen Wang or Xu Rong Mei.

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Hao, Y.B., Cui, X.Y., Wang, Y.F. et al. Predominance of Precipitation and Temperature Controls on Ecosystem CO2 Exchange in Zoige Alpine Wetlands of Southwest China. Wetlands 31, 413–422 (2011). https://doi.org/10.1007/s13157-011-0151-1

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  • DOI: https://doi.org/10.1007/s13157-011-0151-1

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