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Two decades of normalized difference vegetation index changes in South America: identifying the imprint of global change / J.M. Paruelo in International Journal of Remote Sensing IJRS, vol 25 n° 14 (July 2004)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 25 n° 14 (July 2004) . - pp 2793 - 2806 Titre : Two decades of normalized difference vegetation index changes in South America: identifying the imprint of global change Type de document : Article/Communication Auteurs : J.M. Paruelo, Auteur ; M.F. Garbulsky, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 2793 - 2806 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Amérique du sud [Termes IGN] analyse diachronique [Termes IGN] atmosphère terrestre [Termes IGN] biome [Termes IGN] changement climatique [Termes IGN] couvert végétal [Termes IGN] forêt équatoriale [Termes IGN] forêt tempérée [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] photosynthèse [Termes IGN] production primaire brute [Termes IGN] savane Résumé : (Auteur) Estimates of carbon uptake at the continental scale become urgently needed as the role of countries as net sinks or sources of carbon gains political and economic importance. Despite uncertainties related to radiation use efficiency, the amount of photosynthetically active radiation (PAR) intercepted by the canopy is a reliable estimator of primary production. Theoretical and empirical data support the relationship between the Normalized Difference Vegetation Index (NDVI) derived from the Advanced Very High Resolution Radiometer sensor on National Oceanic & Atmospheric Administration satellites and the fraction of PAR intercepted by green canopies. It is shown, for the period 1981-2000, that there is an overall increase in the radiation intercepted by the canopy over South America by 1.3%, with rainforests making the largest absolute contribution (45%), followed by savannas (23%). Under conditions of minimal agricultural use, disturbance and anthropogenic N deposition, humid temperate forests showed the highest proportional increase in NDVI during the last two decades (4.9%). Deserts showed a net reduction in NDVI relative to the 1981-1985 average (-4.4%). The expansion of agriculture over the last two decades was associated with NDVI reductions over subtropical forests. NDVI trends in South American region highlight a biome-dependent imprint of major global change noticeable in only two decades. Numéro de notice : A2004-292 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160310001619526 En ligne : https://doi.org/10.1080/01431160310001619526 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26819 [article]

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