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Seasonal variations and mechanism for environmental control of NEE of CO$_{2}$ concerning the Potentilla fruticosa in alpine shrub meadow of Qinghai-Tibet Plateau

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Seasonal variations and mechanism for environmental control of NEE of CO$_{2}$ concerning the Potentilla fruticosa in alpine shrub meadow of Qinghai-Tibet Plateau

Content Provider	Springer Nature Link
Author	Li, Yingnian Sun, Xiaomin Zhao, Xinquan Zhao, Liang Xu, Shixiao Gu, Song ZhangG, Fawei Yu, Guirui
Copyright Year	2006
Abstract	The study by the eddy covariance technique in the alpine shrub meadow of the Qinghai-Tibet Plateau in 2003 and 2004 showed that the net ecosystem carbon dioxide exchange (NEE) exhibited noticeable diurnal and annual variations, with more distinct daily changes during the warmer seasons. The CO$_{2}$ emission of the shrub ecosystem culminated in April and September while the CO$_{2}$ absorption capacity reached a maximum in July and August. The absorbed carbon dioxide during the two consecutive years was 231.4 and 274.8 g CO$_{2}$·m$^{−2}$ respectively, yielding an average of 253.1 gCO$_{2}$·m$^{−2}$ per year: that accounts for a large proportion of absorbed CO$_{2}$ in the region. Obviously, the diurnal carbon flux was negatively related to temperature, radiation and other atmospheric factors. Still, minute discrepancies in kurtosis and duration of carbon emission/absorption were detected between 2003 and 2004. It was found that the CO$_{2}$ flux in the daytime was similarly affected by photosynthetic photon flux density in both years. Temperature appears to be the most important determinant of CO$_{2}$ flux: specifically, the high temperature during the plant growing season inhibits the carbon absorption capacity. One potential explanation is that soil respiration is enhanced under such condition. Analysis of biomass revealed that the annual net carbon fixed capacity of aboveground and belowground biomass was 544.0 in 2003 and 559.4 g C·m$^{−2}$ in 2004, which coincided with the NEE absorption capacity (63.1 g C·m$^{−2}$ in 2003 and 74.9 g C·m$^{−2}$ in 2004) in the corresponding plant growing season.
Starting Page	174
Ending Page	185
Page Count	12
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	49
Issue Number	2
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2006-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	Potentilla fruticosa shrub meadow yearly meteorological conditions CO$_{2}$ exchange variations meteorological factors aboveground and belowground biomass LAI Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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Seasonal variations and mechanism for environmental control of NEE of CO$_{2}$ concerning the Potentilla fruticosa in alpine shrub meadow of Qinghai-Tibet Plateau

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