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| Titel |
Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices |
| VerfasserIn |
G. Wohlfahrt, S. Pilloni, L. Hörtnagl, A. Hammerle |
| 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 ; 7, no. 2 ; Nr. 7, no. 2 (2010-02-17), S.683-694 |
| Datensatznummer |
250004496
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| Publikation (Nr.) |
 copernicus.org/bg-7-683-2010.pdf |
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| Zusammenfassung |
| The broad-band normalised difference vegetation index (NDVI) and the simple
ratio (SR) were calculated from measurements of reflectance of
photosynthetically active and short-wave radiation at two temperate
mountain grasslands in Austria and related to the net ecosystem CO2
exchange (NEE) measured concurrently by means of the eddy covariance method.
There was no significant statistical difference between the relationships of
midday mean NEE with narrow- and broad-band NDVI and SR, measured
during and calculated for that same time window, respectively. The skill of
broad-band NDVI and SR in predicting CO2 fluxes was higher for
metrics dominated by gross photosynthesis and lowest for ecosystem
respiration, with NEE in between. A method based on a simple light response
model whose parameters were parameterised based on broad-band NDVI
allowed to improve predictions of daily NEE and is suggested to hold promise
for filling gaps in the NEE time series. Relationships of CO2 flux
metrics with broad-band NDVI and SR however generally differed between
the two studied grassland sites indicting an influence of additional factors
not yet accounted for. |
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