Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices
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 CO<sub>2<...
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2010-02-01
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Series: | Biogeosciences |
Online Access: | http://www.biogeosciences.net/7/683/2010/bg-7-683-2010.pdf |
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doaj-0cdc6d1bab6c4ff2804b2a79831bd7f92020-11-24T21:11:26ZengCopernicus PublicationsBiogeosciences1726-41701726-41892010-02-0172683694Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indicesG. WohlfahrtS. PilloniL. HörtnaglA. HammerleThe 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 CO<sub>2</sub> 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 CO<sub>2</sub> 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 CO<sub>2</sub> 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. http://www.biogeosciences.net/7/683/2010/bg-7-683-2010.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
G. Wohlfahrt S. Pilloni L. Hörtnagl A. Hammerle |
spellingShingle |
G. Wohlfahrt S. Pilloni L. Hörtnagl A. Hammerle Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices Biogeosciences |
author_facet |
G. Wohlfahrt S. Pilloni L. Hörtnagl A. Hammerle |
author_sort |
G. Wohlfahrt |
title |
Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices |
title_short |
Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices |
title_full |
Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices |
title_fullStr |
Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices |
title_full_unstemmed |
Estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices |
title_sort |
estimating carbon dioxide fluxes from temperate mountain grasslands using broad-band vegetation indices |
publisher |
Copernicus Publications |
series |
Biogeosciences |
issn |
1726-4170 1726-4189 |
publishDate |
2010-02-01 |
description |
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 CO<sub>2</sub> 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 CO<sub>2</sub> 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 CO<sub>2</sub> 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. |
url |
http://www.biogeosciences.net/7/683/2010/bg-7-683-2010.pdf |
work_keys_str_mv |
AT gwohlfahrt estimatingcarbondioxidefluxesfromtemperatemountaingrasslandsusingbroadbandvegetationindices AT spilloni estimatingcarbondioxidefluxesfromtemperatemountaingrasslandsusingbroadbandvegetationindices AT lhortnagl estimatingcarbondioxidefluxesfromtemperatemountaingrasslandsusingbroadbandvegetationindices AT ahammerle estimatingcarbondioxidefluxesfromtemperatemountaingrasslandsusingbroadbandvegetationindices |
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