Validation of Gross Primary Production Estimated by Remote Sensing for the Ecosystems of Doñana National Park through Improvements in Light Use Efficiency Estimation
Gómez-Giráldez, Pedro J. (Estación Biológica de Doñana)
Cristóbal, Jordi (Universitat Autònoma de Barcelona. Departament de Geografia)
Nieto, H. (Instituto de Ciencias Agrarias)
García Díaz, Diego (Estación Biológica de Doñana)
Díaz-Delgado, Ricardo (Estación Biológica de Doñana)

Data:	2024
Resum:	Doñana National Park is located in the southwest of the Iberian Peninsula, where water scarcity is recurrent, together with a high heterogeneity in species and ecosystems. Monitoring carbon assimilation is essential to improve knowledge of global change in natural vegetation cover. In this work, a light use efficiency (LUE) model was applied to estimate gross primary production (GPP) in two ecosystems of Doñana, xeric shrub (drought resistant) and seasonal marsh (with grasslands dependent on water hydroperiod) and validated with in situ data from eddy covariance (EC) towers installed in both ecosystems. The model was applied in two ways: (1) using the fraction of absorbed photosynthetically active radiation (FAPAR) from Sentinel-2 and meteorological data from reanalysis (ERA5), and (2) using Sentinel-2 FAPAR, reanalysis solar radiation (ERA5) and the Sentinel-2 land surface water index (LSWI). In both cases and for both ecosystems, the error values are acceptable (below 1 gC/m) and in both ecosystems the model using the LSWI gave better results (R of 0. 8 in marshes and 0. 51 in xeric shrubs). The results also show a greater influence of the water status of the system than of the meteorological variables in this area.
Ajuts:	Agencia Estatal de Investigación PID2022-137022OB-C33 Agencia Estatal de Investigación PCI2023-145988-2 European Commission 871128 Agencia Estatal de Investigación PID2021-127345OR-C31 Ministerio de Ciencia e Innovación TED2021-131237B-C21
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Remote sensing (Basel), Vol. 16, Núm. 12 (June 2024) , art. 2170, ISSN 2072-4292

DOI: 10.3390/rs16122170

17 p, 7.1 MB

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