New perspective on spring vegetation phenology and global climate change based on Tibetan Plateau tree-ring data.

Autor:	Yang B; Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 730000 Lanzhou, China; yangbao@lzb.ac.cn 18794776049@163.com., He M; Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, 730000 Lanzhou, China; yangbao@lzb.ac.cn 18794776049@163.com.; Institute of Geography, University of Erlangen-Nürnberg, D-91058 Erlangen, Germany., Shishov V; Mathematical Methods and Information Technology Department, Siberian Federal University, 660075 Krasnoyarsk, Russia.; Laboratory of Tree-Ring Structure, V.N. Sukachev Institute of Forest, Siberian Branch of the Russian Academy of Sciences, 660036 Krasnoyarsk, Russia., Tychkov I; Mathematical Methods and Information Technology Department, Siberian Federal University, 660075 Krasnoyarsk, Russia., Vaganov E; Siberian Federal University, 660041 Krasnoyarsk, Russia., Rossi S; Département des Sciences Fondamentales, Université du Québec à Chicoutimi, Chicoutimi, G7H2B1 QC, Canada.; Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, 510650 Guangzhou, China., Ljungqvist FC; Department of History, Stockholm University, SE-106 91 Stockholm, Sweden.; Bolin Centre for Climate Research, Stockholm University, SE-106 91 Stockholm, Sweden., Bräuning A; Institute of Geography, University of Erlangen-Nürnberg, D-91058 Erlangen, Germany., Grießinger J; Institute of Geography, University of Erlangen-Nürnberg, D-91058 Erlangen, Germany.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2017 Jul 03; Vol. 114 (27), pp. 6966-6971. Date of Electronic Publication: 2017 Jun 19.
DOI:	10.1073/pnas.1616608114
Abstrakt:	Phenological responses of vegetation to climate, in particular to the ongoing warming trend, have received much attention. However, divergent results from the analyses of remote sensing data have been obtained for the Tibetan Plateau (TP), the world's largest high-elevation region. This study provides a perspective on vegetation phenology shifts during 1960-2014, gained using an innovative approach based on a well-validated, process-based, tree-ring growth model that is independent of temporal changes in technical properties and image quality of remote sensing products. Twenty composite site chronologies were analyzed, comprising about 3,000 trees from forested areas across the TP. We found that the start of the growing season (SOS) has advanced, on average, by 0.28 d/y over the period 1960-2014. The end of the growing season (EOS) has been delayed, by an estimated 0.33 d/y during 1982-2014. No significant changes in SOS or EOS were observed during 1960-1981. April-June and August-September minimum temperatures are the main climatic drivers for SOS and EOS, respectively. An increase of 1 °C in April-June minimum temperature shifted the dates of xylem phenology by 6 to 7 d, lengthening the period of tree-ring formation. This study extends the chronology of TP phenology farther back in time and reconciles the disparate views on SOS derived from remote sensing data. Scaling up this analysis may improve understanding of climate change effects and related phenological and plant productivity on a global scale. Competing Interests: The authors declare no conflict of interest.
Databáze:	MEDLINE
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