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European Facility For Airborne Research Sept. 19, 2018, 19:46

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Description
Title Spatio-Temporal Relationships between Optical Information and Carbon Fluxes in a Mediterranean Tree-Grass Ecosystem
Type Publication
Abstract:

Spatio-temporal mismatches between Remote Sensing (RS) and Eddy Covariance (EC) data as well as spatial heterogeneity jeopardize terrestrial Gross Primary Production (GPP) modeling. This article combines: (a) high spatial resolution hyperspectral imagery; (b) EC footprint climatology estimates; and (c) semi-empirical models of increasing complexity to analyze the impact of these factors on GPP estimation. Analyses are carried out in a Mediterranean Tree-Grass Ecosystem (TGE) that combines vegetation with very different physiologies and structure. Half-hourly GPP (GPPhh) were predicted with relative errors ~36%. Results suggest that, at EC footprint scale, the ecosystem signals are quite homogeneous, despite tree and grass mixture. Models fit using EC and RS data with high degree of spatial and temporal match did not significantly improved models performance; in fact, errors were explained by meteorological variables instead. In addition, the performance of the different models was quite similar. This suggests that none of the models accurately represented light use efficiency or the fraction of absorbed photosynthetically active radiation. This is partly due to model formulation; however, results also suggest that the mixture of the different vegetation types might contribute to hamper such modeling, and should be accounted for GPP models in TGE and other heterogeneous ecosystems.

Available from http://www.mdpi.com/2072-4292/9/6/608
Author
CARRARA Arnaud
EL-MADANY Tarek
MARTIN M. Pilar
MIGLIAVACCA Mirco
PACHECO-LABRADOR Javier
ROSSINI Micol
ZARCO-TEJADA Pablo j.
Reference
Journal Remote Sensing
Volume 9
Pages
Year 2017
Times cited None
Institute country Germany
Type of science
  • Biology and Ecology (includes animals and vegetation)
Field of science
  • Biosphere
File details
Added Aug. 16, 2017, 14:50
Last update Aug. 16, 2017, 14:59
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