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An algorithm to derive the fraction of photosynthetically active radiation absorbed by photosynthetic elements of the canopy (FAPARps) from eddy covariance flux tower data

An algorithm to derive the fraction of photosynthetically active radiation absorbed by photosynthetic elements of the canopy (FAPARps) from eddy covariance flux tower data
An algorithm to derive the fraction of photosynthetically active radiation absorbed by photosynthetic elements of the canopy (FAPARps) from eddy covariance flux tower data
* The fraction of absorbed photosynthetically active radiation (FAPAR) is a key vegetation biophysical variable in most production efficiency models (PEMs). Operational FAPAR products derived from satellite data do not distinguish between the fraction of photosynthetically active radiation (PAR) absorbed by nonphotosynthetic and photosynthetic components of vegetation canopy, which would result in errors in representation of the exact absorbed PAR utilized in photosynthesis.

*The possibility of deriving only the fraction of PAR absorbed by photosynthetic elements of the canopy (i.e. FAPARps) was investigated.

*The approach adopted involved inversion of net ecosystem exchange data from eddy covariance measurements to calculate FAPARps. The derived FAPARps was then related to three vegetation indices (i.e. Normalized Difference Vegetation Index (NDVI), Medium Resolution Imaging Spectrometer (MERIS) Terrestrial Chlorophyll Index (MTCI) and Enhanced Vegetation Index (EVI)) in an attempt to determine their potential as surrogates for FAPARps. Finally, the FAPARps was evaluated against two operational satellite data-derived FAPAR products (i.e. MODIS and CYCLOPES products).

*The maximum FAPARps from the inversion approach ranged between 0.6 and 0.8. The inversion approach also predicted site-specific Q10-modelled daytime respiration successfully (R2 > 0.8). The vegetation indices were positively correlated (R2 = 0.67–0.88) to the FAPARps. Finally, the two operational FAPAR products overestimated the FAPARps. This was attributed to the two products deriving FAPAR for the whole canopy rather than for only photosynthetic elements in the canopy.
fraction of absorbed photosynthetically active radiation (FAPAR), light-use efficiency, net ecosystem exchange, production efficiency models, respiration, vegetation indices
0028-646X
511-523
Ogutu, Booker
4e36f1d2-f417-4274-8f9c-4470d4808746
Dash, Jadunandan
51468afb-3d56-4d3a-aace-736b63e9fac8
Ogutu, Booker
4e36f1d2-f417-4274-8f9c-4470d4808746
Dash, Jadunandan
51468afb-3d56-4d3a-aace-736b63e9fac8

Ogutu, Booker and Dash, Jadunandan (2013) An algorithm to derive the fraction of photosynthetically active radiation absorbed by photosynthetic elements of the canopy (FAPARps) from eddy covariance flux tower data. New Phytologist, 197 (2), 511-523. (doi:10.1111/nph.12039).

Record type: Article

Abstract

* The fraction of absorbed photosynthetically active radiation (FAPAR) is a key vegetation biophysical variable in most production efficiency models (PEMs). Operational FAPAR products derived from satellite data do not distinguish between the fraction of photosynthetically active radiation (PAR) absorbed by nonphotosynthetic and photosynthetic components of vegetation canopy, which would result in errors in representation of the exact absorbed PAR utilized in photosynthesis.

*The possibility of deriving only the fraction of PAR absorbed by photosynthetic elements of the canopy (i.e. FAPARps) was investigated.

*The approach adopted involved inversion of net ecosystem exchange data from eddy covariance measurements to calculate FAPARps. The derived FAPARps was then related to three vegetation indices (i.e. Normalized Difference Vegetation Index (NDVI), Medium Resolution Imaging Spectrometer (MERIS) Terrestrial Chlorophyll Index (MTCI) and Enhanced Vegetation Index (EVI)) in an attempt to determine their potential as surrogates for FAPARps. Finally, the FAPARps was evaluated against two operational satellite data-derived FAPAR products (i.e. MODIS and CYCLOPES products).

*The maximum FAPARps from the inversion approach ranged between 0.6 and 0.8. The inversion approach also predicted site-specific Q10-modelled daytime respiration successfully (R2 > 0.8). The vegetation indices were positively correlated (R2 = 0.67–0.88) to the FAPARps. Finally, the two operational FAPAR products overestimated the FAPARps. This was attributed to the two products deriving FAPAR for the whole canopy rather than for only photosynthetic elements in the canopy.

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More information

Accepted/In Press date: 4 October 2012
e-pub ahead of print date: 22 November 2012
Published date: January 2013
Keywords: fraction of absorbed photosynthetically active radiation (FAPAR), light-use efficiency, net ecosystem exchange, production efficiency models, respiration, vegetation indices
Organisations: Global Env Change & Earth Observation

Identifiers

Local EPrints ID: 347764
URI: http://eprints.soton.ac.uk/id/eprint/347764
ISSN: 0028-646X
PURE UUID: 478b2b54-dede-4a9c-9f29-13de498105a3
ORCID for Booker Ogutu: ORCID iD orcid.org/0000-0002-1804-6205
ORCID for Jadunandan Dash: ORCID iD orcid.org/0000-0002-5444-2109

Catalogue record

Date deposited: 30 Jan 2013 14:43
Last modified: 15 Mar 2024 03:33

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