Remote estimation of carbon dioxide uptake by a Mediterranean forest
Garbulsky, Martín Fabio (Centre de Recerca Ecològica i Aplicacions Forestals. Unitat d'Ecofisiologia i Canvi Global)
Filella Cubells, Iolanda (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)

Data: 2008
Resum: The estimation of the carbon balance in ecosystems, regions, and the biosphere is currently one of the main concerns in the study of the ecology of global change. Current remote sensing methodologies for estimating gross primary productivity are not satisfactory because they rely too heavily on (i) the availability of climatic data, (ii) the definition of land-use cover, and (iii) the assumptions of the effects of these two factors on the radiation-use efficiency of vegetation (RUE). A new methodology is urgently needed that will actually assess RUE and overcome the problems associated with the capture of fluctuations in carbon absorption in space and over time. Remote sensing techniques such as the widely used reflectance vegetation indices (e. g. NDVI, EVI) allow green plant biomass and therefore plant photosynthetic capacity to be assessed. However, there are vegetation types, such as the Mediterranean forests, with a very low seasonality of these vegetation indices and a high seasonality of carbon uptake. In these cases it is important to detect how much of this capacity is actually realized, which is a much more challenging goal. The photochemical reflectance index (PRI) derived from freely available satellite information (MODIS sensor) presented for a 5-year analysis for a Mediterranean forest a positive relationship with the RUE. Thus, we show that it is possible to estimate RUE and GPP in real time and therefore actual carbon uptake of Mediterranean forests at ecosystem level using the PRI. This conceptual and technological advancement would avoid the need to rely on the sometimes unreliable maximum RUE.
Drets: Tots els drets reservats
Llengua: Anglès.
Document: article ; recerca ; publishedVersion
Matèria: Carbon cycle ; CO2 uptake ; Eddy covariance ; Mediterranean forests ; MODIS ; Primary productivity ; Radiation use efficiency ; Remote sensing ; Vegetation ; Ciclo del carbono ; Absorción de CO2 ; Covarianza de Eddy ; Bosques mediterráneos ; Productividad primaria ; Eficiencia en el uso de radiación ; Teledetección ; Vegetación ; Cicle del carboni ; Absorció de CO2 ; Covariància de Eddy ; Boscos mediterranis ; Productivitat primària ; Eficiència en l'ús de radiació ; Teledetecció ; Vegetació
Publicat a: Global Change Biology, Vol. 14, Núm. 12 (Desembre 2008) , p. 2860–2867, ISSN 1365-2486

8 p, 173.7 KB

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Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Articles de recerca
Articles > Articles publicats

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