Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1059
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
23 Dec 2016
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Biophysical effects on the interannual variation in carbon dioxide exchange of an alpine meadow on the Tibetan Plateau
Lei Wang1, Huizhi Liu1, Jihua Sun2, and Yaping Shao3 1LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
2Meteorological Observatory of Yunnan Province, Kunming 650034, China
3Institute for Geophysics and Meteorology, University of Cologne, Cologne, 50937, Germany
Abstract. Eddy covariance measurements from 2012 to 2015 were used to investigate the interannual variation in carbon dioxide exchange and its control over an alpine meadow on the southeast margin of the Tibetan Plateau. The annual net ecosystem exchange (NEE) from 2012 to 2015 was −114.2, −158.5, −159.9 and −212.6 g C m−2 yr−1 and generally decreased with the mean annual air temperature (MAT). An exception occurred in 2014, which had the highest MAT. This was attributed to higher ecosystem respiration (RE) and similar gross primary production (GPP) in 2014 because the GPP increased with MAT but became saturated due to the photosynthesis capacity limit. In the spring (March to May) of 2012, lower air temperature (Ta) and drought events delayed grass germination and reduced GPP. In the late wet season (September to October) of 2012 and 2013, the lower Ta in September and its negative effects on vegetation growth caused earlier grass senescence and significantly lower GPP. This indicates that the seasonal pattern of Ta greatly affected the annual total GPP, which is consistent with the result of the homogeneity-of-slopes model. The model shows that the climatic seasonal variation explained 48.6 % of the GPP variability, and the percentage of climatic interannual variation and the ecosystem functional change were 9.7 % and 10.6 %, respectively.

Citation: Wang, L., Liu, H., Sun, J., and Shao, Y.: Biophysical effects on the interannual variation in carbon dioxide exchange of an alpine meadow on the Tibetan Plateau, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1059, in review, 2016.
Lei Wang et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC1: 'comments form the reviwer', Anonymous Referee #1, 12 Jan 2017 Printer-friendly Version 
AC1: 'Response to the comments by Anonymous Referee #1', Huizhi LIU, 30 Jan 2017 Printer-friendly Version 
 
RC2: 'Comments', Anonymous Referee #2, 30 Jan 2017 Printer-friendly Version 
Lei Wang et al.
Lei Wang et al.

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Short summary
This study found that the seasonal variation in CO2 exchange over an alpine meadow on the Tibetan Plateau was primarily affected by the seasonal pattern of air temperature, especially in spring and autumn. The annual net ecosystem exchange decreased with mean annual temperature, and then increased when the gross primary production became saturated. This study contributes to the response of the alpine meadow ecosystem to global warming.
This study found that the seasonal variation in CO2 exchange over an alpine meadow on the...
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