Temperature controls ecosystem CO 2 exchange of an alpine meadow on the northeastern Tibetan Plateau
2008; Wiley; Volume: 15; Issue: 1 Linguagem: Inglês
10.1111/j.1365-2486.2008.01713.x
ISSN1365-2486
AutoresMakoto Saito, Tomomichi Kato, Yanhong Tang,
Tópico(s)Plant responses to elevated CO2
ResumoGlobal Change BiologyVolume 15, Issue 1 p. 221-228 Temperature controls ecosystem CO2 exchange of an alpine meadow on the northeastern Tibetan Plateau MAKOTO SAITO, MAKOTO SAITO Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan,Search for more papers by this authorTOMOMICHI KATO, TOMOMICHI KATO Ecosystem Change Research Program, Frontier Research Center for Global Change, Japan Agency for Marine–Earth Science and Technology, Yokohama, Kanazawa 236-0001, Japan,Search for more papers by this authorYANHONG TANG, YANHONG TANG National Institute for Environmental Studies, Tsukuba 305-8506, JapanSearch for more papers by this author MAKOTO SAITO, MAKOTO SAITO Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan,Search for more papers by this authorTOMOMICHI KATO, TOMOMICHI KATO Ecosystem Change Research Program, Frontier Research Center for Global Change, Japan Agency for Marine–Earth Science and Technology, Yokohama, Kanazawa 236-0001, Japan,Search for more papers by this authorYANHONG TANG, YANHONG TANG National Institute for Environmental Studies, Tsukuba 305-8506, JapanSearch for more papers by this author First published: 08 January 2009 https://doi.org/10.1111/j.1365-2486.2008.01713.xCitations: 115 Makoto Saito, tel. +81 29 850 2968, fax +81 29 850 2219, e-mail: [email protected] Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Alpine ecosystems are extremely vulnerable to climate change. To address the potential variability of the responses of alpine ecosystems to climate change, we examined daily CO2 exchange in relation to major environmental variables. A dataset was obtained from an alpine meadow on the Qinghai-Tibetan Plateau from eddy covariance measurements taken over 3 years (2002–2004). Path analysis showed that soil temperature at 5 cm depth (Ts5) had the greatest effect on daily variation in ecosystem CO2 exchange all year around, whereas photosynthetic photon flux density (PPFD) had a high direct effect on daily variation in CO2 flux during the growing season. The combined effects of temperature and light regimes on net ecosystem CO2 exchange (NEE) could be clearly categorized into three areas depending on the change in Ts5: (1) almost no NEE change irrespective of variations in light and temperature when Ts5 was below 0 °C; (2) an NEE increase (i.e. CO2 released from the ecosystem) with increasing Ts5, but little response to variation in light regime when 0 °C≤Ts5≤8 °C; and (3) an NEE decrease with increase in Ts5 and PPFD when Ts5 was approximately >8 °C. The highest daily net ecosystem CO2 uptake was observed under the conditions of daily mean Ts5 of about 15 °C and daily mean PPFD of about 50 mol m−2 day−1. The results suggested that temperature is the most critical determinant of CO2 exchange in this alpine meadow ecosystem and may play an important role in the ecosystem carbon budget under future global warming conditions. 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