Marto Garbulsky
IFEVA, Catedra de Forrajicultura, Faculty Member
An increasing number of observational evidences on the biological effects of climate change are becoming available in Catalonia. Biological spring and winter have been advanced and delayed, respectively. Specifically, the vegetative... more
An increasing number of observational evidences on the biological effects of climate change are becoming available in Catalonia. Biological spring and winter have been advanced and delayed, respectively. Specifically, the vegetative period has extended about 5 days per decade during the last fifty years. In addition, Mediterranean plants and animals seem to move upwards in Catalan mountains. Many other changes have been observed in the last decades in response to this climatic change: more frequent and severe droughts, greater fire risks, greater biogenic volatile organic compound emissions from our ecosystems, etc. The warming and the precipitation decrease projected for the next decades, if they occur, will affect the physiology, phenology, growth, reproduction, establishment and, finally, the distribution of organisms, and therefore the structure and functioning (e.g., CO2 uptake or nitrate leaching) of the ecosystems. In fact, experimental studies simulating warming and drought ...
Josep Peñuelas, Iolanda Filella, Marc Estiarte, Romà Ogaya, Joan Llusià, Jordi Sardans, Alistair Jump, Jorge Curiel, Jofre Carnicer, This Rutishauser, Laura Rico, Trevor Keenan, Martín Garbulsky, Marta Coll, Maria Diaz de Quijano, Roger... more
Josep Peñuelas, Iolanda Filella, Marc Estiarte, Romà Ogaya, Joan Llusià, Jordi Sardans, Alistair Jump, Jorge Curiel, Jofre Carnicer, This Rutishauser, Laura Rico, Trevor Keenan, Martín Garbulsky, Marta Coll, Maria Diaz de Quijano, Roger Seco, Albert Rivas-Ubach, Jorge Silva, Martí Boada, Constantí Stefanescu, Francisco Lloret i Jaume Terradas* Unitat d’Ecologia Global CSIC-CEAB-CREAF, CREAF (Centre de Recerca Ecològica i Aplicacions Forestals), Universitat Autònoma de Barcelona, Bellaterra
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NOAA/AVHRR satellite imagery has been widely used for vegetation studies at global and regional scales, to study for example the exchange of matter and energy between the ecosystem and the atmosphere or to generate land cover maps. PAL... more
NOAA/AVHRR satellite imagery has been widely used for vegetation studies at global and regional scales, to study for example the exchange of matter and energy between the ecosystem and the atmosphere or to generate land cover maps. PAL and LAC products are usually processed as maximum composite yielding an image every 10 days, with 8 and 1 km spatial resolution, respectively. However differences in the processing algorithms and on the data available to generate the products, radiometric data and spectral indices derived are not equal. The objective of this analysis was to generate mathematical relationships between data provided by LAC and PAL imagery, in order to make them comparables for vegetation studies. We work with 36 NDVI 10 day composites for the 1992-93 growing season from each of the databases for southern South America. The LAC images were degraded to the same spatial resolution of the PAL images (8km) in order to make both sources comparables. We worked on the values of...
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Research Interests: Environmental Science, Remote Sensing, Global change, Remote, Geomatic Engineering, and 8 moreSouth America, Primary Production, Biome, Radiation Use Efficiency, Temperate Forest, Photosynthetically active radiation (PAR), Normalized Difference Vegetation Index, and Advanced Very High Resolution Radiometer (AVHRR)
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Research Interests: Physical Geography, Environmental Science, Remote Sensing, Climate variability, Productivity, and 15 moreEcology, Carbon Cycle, Rain forest, Eddy Covariance, Evapotranspiration, Potential Evapotranspiration, Energy Balance, Primary Production, Ecosystem, Primary productivity, Global Ecology, Ecological Applications, Mean Annual Temperature, Radiation Use Efficiency, and gross Primary Production
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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... more
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. Nevertheless, detecting how much of this capacity is actually realized is a much more challenging goal. The Photochemical Reflectance Index (...
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La captacion de carbono por la vegetacion es a escala global el flujo mas grande de CO2 e influencia en gran medida el funcionamiento de los ecosistemas. Sin embargo, su variabilidad temporal y espacial sigue siendo poco conocida y... more
La captacion de carbono por la vegetacion es a escala global el flujo mas grande de CO2 e influencia en gran medida el funcionamiento de los ecosistemas. Sin embargo, su variabilidad temporal y espacial sigue siendo poco conocida y dificil de estimar. Las tecnicas de teledeteccion pueden ayudar a calcular mejor la produccion primaria bruta (GPP) terrestre, que es la expresion a nivel de ecosistemas del proceso de la fotosintesis. El objetivo principal de esta tesis fue encontrar una manera de estimar la variabilidad espacial y temporal de la eficiencia en el uso de la radiacion (RUE) a escala de ecosistema y por lo tanto mejorar la estimacion de la GPP de la vegetacion terrestre por medio de datos de teledeteccion. Se abordaron cuatro objetivos especificos. El primero fue analizar y sintetizar la literatura cientifica sobre la relacion entre el Indice de Reflectancia Fotoquimica (PRI), un indice espectral vinculado a la eficiencia fotosintetica, y diversas variables ecofisiologicas a traves de un amplio rango de tipos funcionales de plantas y ecosistemas. El segundo objetivo fue analizar y sintetizar los datos de la variabilidad espacial de la GPP y la variabilidad espacial y temporal de la RUE y sus controles climaticos para un amplio rango de tipos de vegetacion, desde la tundra a la selva tropical. El tercer objetivo fue comprobar si diferentes indices espectrales, es decir, el PRI, el NDVI (Normalized Difference Vegetation Index) y EVI (Enhanced Vegetation Index), derivados del Moderate Resolution Imaging Spectroradiometer (MODIS) son buenos estimadores de la captacion de carbono a diferentes escalas temporales en un bosque mediterraneo. El cuarto objetivo fue evaluar el uso de MODIS PRI como estimador de la RUE en un amplio rango de tipos de vegetacion mediante el uso de datos sobre la captacion de carbono de la vegetacion derivados de las torres de covarianza turbulenta. Las principales conclusiones de esta tesis son que hay una coherencia emergente de la relacion RUE-PRI que sugiere un sorprendente grado de convergencia funcional de los componentes bioquimicos, fisiologicos y estructurales que afectan la eficiencia de captacion de carbono a escala de hoja, de cobertura y de ecosistemas. Al complementar las estimaciones de la fraccion de radiacion fotosinteticamente activa interceptada por la vegetacion (FPAR), el PRI permite mejorar la evaluacion de los flujos de carbono a diferentes escalas, a traves de la estimacion de la RUE. Una segunda conclusion apoya la idea de que el funcionamiento anual de la vegetacion es mas limitado por la disponibilidad de agua que por la temperatura. La variabilidad espacial de la RUE anual y maxima puede explicarse en gran medida por la precipitacion anual, mas que por el tipo de vegetacion. Una tercera conclusion es que, si bien EVI puede estimar el incremento diametral anual de los troncos, y el PRI puede estimar la fotosintesis neta diaria nivel de hoja y la eficiencia en el uso de radiacion, el papel del NDVI es mas limitado como un estimador de cualquier parte del ciclo del carbono en bosques mediterraneos. Por lo tanto, el EVI y el PRI son excelentes herramientas para el seguimiento del ciclo del carbono en los bosques mediterraneos. Por ultimo, el PRI derivado de informacion satelital disponible libremente, presenta una relacion positiva significativa con la RUE para un amplio rango de diferentes tipos de bosques, incluso en anos determinados, en bosques caducifolios. En general, esta tesis proporciona un mejor entendimiento de los controles espacial y temporal de la RUE y abre la posibilidad de estimar RUE en tiempo real y, por tanto, la captacion de carbono de los bosques a nivel de ecosistemas a partir del PRI.
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Research Interests: Photochemistry, Photosynthesis, Biomass, Evaluation, Ecophysiology, and 15 moreEcosystems, Ndvi, Photochemical Reflectance Index, Environmental Variables, Geomatic Engineering, Metaanalysis, Capacity, Indexation, Evolutionary Strategy, PRI, Evi, Radiation Use Efficiency, gross Primary Production, FWHM, and Plant Leaf
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Research Interests: Earth Sciences, Environmental Science, Arid environments, Convergence, Biological Sciences, and 15 moreEnvironmental Sciences, Patagonia, Ndvi, Nutrient Limitation, Evolutionary History, Sandy soil, Arid Zone, Forage Quality, Arid, Livestock Grazing, Plant Community, Total Nitrogen, Soil Water, Soil Texture, and Growing Season
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Research Interests: Remote Sensing, Carbon Dioxide, Carbon Cycle, Global Change Biology, Biological Sciences, and 11 moreGlobal change, Seasonality, Environmental Sciences, Eddy Covariance, Photochemical Reflectance Index, Carbon balance, Real Time, Primary Production, Vegetation indices, Radiation Use Efficiency, and gross Primary Production
ABSTRACT Photosynthetic light use efficiency from satellite sensors: from global to Mediterranean vegetation, Environmental and Experimental Botany (2013), http://dx.doi.org/10.1016/j.envexpbot.2013.10.009 This is a PDF file of an... more
ABSTRACT Photosynthetic light use efficiency from satellite sensors: from global to Mediterranean vegetation, Environmental and Experimental Botany (2013), http://dx.doi.org/10.1016/j.envexpbot.2013.10.009 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
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Research Interests: Remote Sensing, Ecology, Endangered Species, Global change, Seasonality, and 14 moreHabitat, Low Energy Buildngs, Ndvi, Extinction, Seasonal variation, Brown bear, Primary Production, Habitat Quality, Ecosystem Function, Point Pattern Analysis, Ecological Applications, Ursus Arctos, Normalized Difference Vegetation Index, and Pattern analysis
... Mapeo indirecto de la vegetación de Sierra de la Ventana, provincia de Buenos Aires JOSÉ MLIZZI *, MARTÍN FGARBULSKY ✉, RODOLFO AGOLLUSCIO ** & ALEJANDRO VDEREGIBUS *** Cátedra de Forrajicultura. Facultad de Agronomía. Univ. de... more
... Mapeo indirecto de la vegetación de Sierra de la Ventana, provincia de Buenos Aires JOSÉ MLIZZI *, MARTÍN FGARBULSKY ✉, RODOLFO AGOLLUSCIO ** & ALEJANDRO VDEREGIBUS *** Cátedra de Forrajicultura. Facultad de Agronomía. Univ. de Buenos Aires. ...