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Journal of Mountain Science

, Volume 10, Issue 3, pp 455–463 | Cite as

Response of ecosystem respiration to experimental warming and clipping at daily time scale in an alpine meadow of tibet

  • Gang Fu
  • Zhen-xi Shen
  • Xian-zhou ZhangEmail author
  • Cheng-qun Yu
  • Yu-ting Zhou
  • Yun-long Li
  • Peng-wan Yang
Article

Abstract

The alpine meadow, as one of the typical vegetation types on the Tibetan Plateau, is one of the most sensitive terrestrial ecosystems to climate warming. However, how climate warming affects the carbon cycling of the alpine meadow on the Tibetan Plateau is not very clear. A field experiment under controlled experimental warming and clipping conditions was conducted in an alpine meadow on the Northern Tibetan Plateau since July 2008. Open top chambers (OTCs) were used to simulate climate warming. The main objective of this study was to examine the responses of ecosystem respiration (R eco ) and its temperature sensitivity to experimental warming and clipping at daily time scale. Therefore, we measured R eco once or twice a month from July to September in 2010, from June to September in 2011 and from August to September in 2012. Air temperature dominated daily variation of Reco whether or not experimental warming and clipping were present. Air temperature was exponentially correlated with R eco and it could significantly explain 58∼96% variation of R eco at daily time scale. Experimental warming and clipping decreased daily mean R eco by 5.8∼37.7% and −11.9∼23.0%, respectively, although not all these changes were significant. Experimental warming tended to decrease the temperature sensitivity of R eco , whereas clipping tended to increase the temperature sensitivity of R eco at daily time scale. Our findings suggest that R eco was mainly controlled by air temperature and may acclimate to climate warming due to its lower temperature sensitivity under experimental warming at daily time scale.

Keywords

Acclimation Air temperature Open top chamber Temperature sensitivity Respiration quotient (Q10

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Gang Fu
    • 1
    • 2
  • Zhen-xi Shen
    • 1
  • Xian-zhou Zhang
    • 1
    Email author
  • Cheng-qun Yu
    • 1
  • Yu-ting Zhou
    • 1
    • 2
  • Yun-long Li
    • 1
    • 2
  • Peng-wan Yang
    • 1
    • 2
  1. 1.Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina

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