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| Titel |
Field-based observations of regional-scale, temporal variation in net primary production in Tibetan alpine grasslands |
| VerfasserIn |
Y. Shi, Y. Wang, Y. Ma, W. Ma, C. Liang, D. F. B. Flynn, B. Schmid, J. Fang, J.-S. He |
| 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. 7 ; Nr. 11, no. 7 (2014-04-09), S.2003-2016 |
| Datensatznummer |
250117354
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| Publikation (Nr.) |
 copernicus.org/bg-11-2003-2014.pdf |
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| Zusammenfassung |
| Net primary production (NPP) is a fundamental process of natural ecosystems.
Temporal variation of NPP not only reflects how communities respond to
environmental fluctuations, but it also has important implications for
regional carbon assessment. Unfortunately, studies based on field
measurements to directly address this issue in the extreme environment of
alpine grasslands are rare. In this study, we measured aboveground NPP (ANPP)
and species richness in 40 sites across the Tibetan alpine grasslands from
2006 to 2009 to investigate the regional pattern of temporal variation in
ANPP and to quantify the effects of climate fluctuation and biodiversity on
this variation. The results showed that, during the 4-year period, the
average ANPP varied 1.5-fold, from 83.9 to 125.7 g m−2, with a mean
coefficient of variation of temporal variation of 36.6% across the 40
sites. Compared with other studies, alpine grasslands are not more sensitive
to climate fluctuations than other grassland types. Aboveground NPP exhibited
synchronous temporal variation and consistent spatial patterns over the
4-year period due to the regionally similar climatic fluctuations caused
by monsoon-dominated plateau climate. Surprisingly, rainfall fluctuation had
a more profound effect on the ANPP dynamics than temperature variation, which
suggests that production in the Tibetan alpine grasslands is primarily driven
by precipitation. Therefore, ANPP in the Tibetan alpine grasslands are mainly
constrained by water availability. Finally, we found a reduction in
interannual variation (i.e., CV) in ANPP with increasing species richness of
plant communities, suggesting that diversity can stabilize community
production in high-altitude grasslands. |
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