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| Titel |
Contrasting responses of terrestrial ecosystem production to hot temperature extreme regimes between grassland and forest |
| VerfasserIn |
Y. Zhang, M. Voigt, H. Liu |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2015-01-29), S.549-556 |
| Datensatznummer |
250117788
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| Publikation (Nr.) |
 copernicus.org/bg-12-549-2015.pdf |
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| Zusammenfassung |
| During the past several decades, observational data have shown a faster
increase in hot temperature extremes than the change in mean temperature.
Increasingly high extreme temperatures are expected to affect terrestrial
ecosystem function. The ecological impact of hot extremes on vegetation
production, however, remains uncertain across biomes in natural climatic
conditions. In this study, we investigated the effects of hot temperature
extremes on vegetation production by combining the MODIS enhanced vegetation index (EVI) data set and in situ
climatic records during the period 2000 to 2009 from 12 long-term experimental sites
across biomes and climate. Our results show that higher mean annual maximum
temperatures (Tmax) greatly reduced grassland production, and yet
enhanced forest production after removing the effect of precipitation. The
relative decrease in vegetation production was 16% for arid grassland
and 7% for mesic grassland, and the increase was 5% for forest. We
also observed a significantly positive relationship between interannual aboveground net primary production (ANPP)
and Tmax for the forest biome (R2 = 0.79, P < 0.001). This line
of evidence suggests that hot temperature extremes lead to contrasting
ecosystem-level responses of vegetation production between grassland and
forest biomes. Given that many terrestrial ecosystem models use average daily
temperature as input, predictions of ecosystem production should consider
such contrasting responses to increasingly hot temperature extreme regimes
associated with climate change. |
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