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| Titel |
Evaluation of satellite based indices for gross primary production estimates in a sparse savanna in the Sudan |
| VerfasserIn |
M. Sjöström, J. Ardö, L. Eklundh, B. A. El-Tahir, H. A. M. El-Khidir, M. Hellström, P. Pilesjö, J. Seaquist |
| 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 ; 6, no. 1 ; Nr. 6, no. 1 (2009-01-29), S.129-138 |
| Datensatznummer |
250003320
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| Publikation (Nr.) |
 copernicus.org/bg-6-129-2009.pdf |
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| Zusammenfassung |
| One of the more frequently applied methods for integrating controls on
primary production through satellite data is the Light Use Efficiency (LUE)
approach. Satellite indices such as the Normalized Difference Vegetation
Index (NDVI), Enhanced Vegetation Index (EVI) and the Shortwave Infrared
Water Stress Index (SIWSI) have previously shown promise as predictors of
primary production in several different environments. In this study, we
evaluate NDVI, EVI and SIWSI derived from the Moderate Resolution Imaging
Spectroradiometer (MODIS) satellite sensor against in-situ measurements from
central Sudan in order to asses their applicability in LUE-based primary
production modeling within a water limited environment. Results show a
strong correlation between vegetation indices and gross primary production
(GPP), demonstrating the significance of vegetation indices for deriving
information on primary production with relatively high accuracy at similar
areas. Evaluation of SIWSI however, reveal that the fraction of vegetation
apparently is to low for the index to provide accurate information on canopy
water content, indicating that the use of SIWSI as a predictor of water
stress in satellite data-driven primary production modeling in similar
semi-arid ecosystems is limited. |
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