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| Titel |
Impacts of droughts on carbon sequestration by China's terrestrial ecosystems from 2000 to 2011 |
| VerfasserIn |
Y. Liu, Y. Zhou, W. Ju, S. Wang, X. Wu, M. He, G. Zhu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 10 ; Nr. 11, no. 10 (2014-05-16), S.2583-2599 |
| Datensatznummer |
250117411
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| Publikation (Nr.) |
 copernicus.org/bg-11-2583-2014.pdf |
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| Zusammenfassung |
| In recent years, China's terrestrial ecosystems have experienced frequent
droughts. How these droughts have affected carbon sequestration by the
terrestrial ecosystems is still unclear. In this study, the process-based
Boreal Ecosystem Productivity Simulator (BEPS) model, driven by remotely
sensed vegetation parameters, was employed to assess the effects of droughts
on net ecosystem productivity (NEP) of terrestrial ecosystems in China from
2000 to 2011. Droughts of differing severity, as indicated by a standard
precipitation index (SPI), hit terrestrial ecosystems in China extensively in
2001, 2006, 2009, and 2011. The national total annual NEP exhibited the
slight decline of −11.3 Tg C yr−2 during the aforementioned years of
extensive droughts. The NEP reduction ranged from 61.1 Tg C yr−1 to
168.8 Tg C yr−1. National and regional total NEP anomalies were
correlated with the annual mean SPI, especially in Northwest China, North
China, Central China, and Southwest China. The reductions in annual NEP in
2001 and 2011 might have been caused by a larger decrease in annual gross
primary productivity (GPP) than in annual ecosystem respiration (ER). The
reductions experienced in 2009 might be due to a decrease in annual GPP and
an increase in annual ER, while reductions in 2006 could stem from a larger
increase in ER than in GPP. The effects of droughts on NEP lagged up to 3–6
months, due to different responses of GPP and ER. In eastern China, where is
humid and warm, droughts have predominant and short-term lagged influences on
NEP. In western regions, cold and arid, the drought effects on NEP were
relatively weaker but prone to lasting longer. |
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