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| Titel |
Response of vegetation to the 2003 European drought was mitigated by height |
| VerfasserIn |
S. L. Bevan, S. O. Los, P. R. J. North |
| 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. 11 ; Nr. 11, no. 11 (2014-06-04), S.2897-2908 |
| Datensatznummer |
250117443
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| Publikation (Nr.) |
 copernicus.org/bg-11-2897-2014.pdf |
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| Zusammenfassung |
| The effects on climate of land-cover change, predominantly from the
conversion of forests to crops or grassland, are reasonably well understood
for low and high latitudes but are largely unknown for temperate latitudes.
The main reason for this gap in our knowledge is that there are compensating
effects on the energy and water balance that are related to changes in
land-surface albedo, soil evaporation and plant transpiration. We analyse how
vegetation height affected the response of vegetation during the 2003
European drought using precipitation data, temperature data, normalized
difference vegetation index data and a new vegetation height data set
obtained from the Geoscience Laser Altimeter System (GLAS) on the Ice, Cloud
and land Elevation Satellite (ICESat). At the height of the 2003 drought we
find for tall vegetation a significantly smaller decrease in vegetation index
and a smaller diurnal temperature (DTR) range, indicating less water stress
and drought impacts on tall vegetation. Over Germany for example, 98% of
significant correlations showed a smaller anomaly in vegetation index anomaly
with greater height, and 95% of significant correlations showed a smaller
DTR with greater vegetation height. Over France the equivalent percentages
were 94 and 88%, respectively. Vegetation height is likely associated with
greater rooting depth, canopy heat capacity or both. Our results suggest that
land-surface models can be improved by better estimates of vegetation height
and associated with this a more realistic response to drought. |
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