Net Ecosystem Carbon Dioxide Exchange in Alpine Meadow of Nagchu Region over Qinghai-Xizang Plateau

ZHU Zhikun; HU Zeyong; MA Yaoming; LI Maoshan; SUN Fanglin

doi:10.7522/j.issn.1000-0534.2014.00135

Plateau Meteorology >

2015 , Vol. 34 >Issue 5: 1217 - 1223

DOI: https://doi.org/10.7522/j.issn.1000-0534.2014.00135

Net Ecosystem Carbon Dioxide Exchange in Alpine Meadow of Nagchu Region over Qinghai-Xizang Plateau

ZHU Zhikun ,
HU Zeyong ,
MA Yaoming ,
LI Maoshan ,
SUN Fanglin

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Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;2. Key Laboratory of Tibetan Environment Change and Land Surface Process, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;3. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2014-09-02

Online published: 2015-10-28

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Abstract

Eddy covariance method was used to measure the net ecosystem CO₂ exchange (NEE) between an alpine meadow and the atmosphere at Nagchu station on the central of the Qinghai-Xizang Plateau.The results showed that during the growing season,the maximum CO₂ uptake and release rate were 5.3 and 1.7 μmolCO₂·m^-2·s^-1,respectively.Daily integrated NEE reached its peak magnitude of -8.5 gCO₂·m^-2·d^-1 in the mid of July.Annual integrated NEE was -151.5 gCO₂·m^-2 (-41.3 gC·m^-2),indicating this ecosystem was a carbon sink.However,the net carbon sequestration potential was weak compared to the grassland on the eastern plateau.During the pear growing period,the apparent quantum yield α was -0.0255±0.0105 μmolCO₂·μmol^-1 photons,which was similar to reported results of most C3 grassland under appropriate soil water content.Total daily NEE tended to be higher when day/night temperature difference was greater.The rain pulse occurred during the non-growing season stimulated the ecosystem respiration and had an important influence to the ecosystem carbon balance.

Key words： Alpine meadow; The Qinghai-Xizang P; Eddy covariance; Net ecosystem CO

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ZHU Zhikun , HU Zeyong , MA Yaoming , LI Maoshan , SUN Fanglin . Net Ecosystem Carbon Dioxide Exchange in Alpine Meadow of Nagchu Region over Qinghai-Xizang Plateau[J]. Plateau Meteorology, 2015 , 34(5) : 1217 -1223 . DOI: 10.7522/j.issn.1000-0534.2014.00135

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