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Losses of tree cover in California driven by increasing fire disturbance and climate stress / Jonathan A. Wang in AGU Advances, vol 3 n° 4 (August 2022)  

Public [article]  inAGU Advances > vol 3 n° 4 (August 2022) . - n° e2021AV000654 Titre : Losses of tree cover in California driven by increasing fire disturbance and climate stress Type de document : Article/Communication Auteurs : Jonathan A. Wang, Auteur ; James T. Randerson, Auteur ; Michael L. Goulden, Auteur ; Clarke A. Knight, Auteur ; John J. Battles, Auteur Année de publication : 2022 Article en page(s) : n° e2021AV000654 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse spatio-temporelle [Termes IGN] Californie (Etats-Unis) [Termes IGN] carte de la végétation [Termes IGN] changement climatique [Termes IGN] stress hydrique [Vedettes matières IGN] Végétation et changement climatique Résumé : (auteur) Forests provide natural climate solutions for sequestering carbon and mitigating climate change, yet are increasingly threatened by increasing temperature and disturbance. Understanding these threats requires accurate information on vegetation dynamics and their drivers, which is currently lacking in many regions experiencing rapid climate change such as California. To address this, we combined remote sensing observations with geospatial databases to develop annual maps of vegetation cover (tree, shrub, and herbaceous) and disturbance type (fire, harvest, and forest die-off) in California at 30 m resolution from 1985 to 2021. Considering both changes in cover fraction and areal extent, California lost 4,566 km2 of its tree cover area (6.7% relative to initial cover) since 1985. Substantial gains in tree cover area during the 1990s were more than offset by fire-driven declines since 2000, resulting in greater shrub and herbaceous cover area. Tree cover loss occurred in all ecoregions but was most severe in the southern mountains, where losses from wildfire were not compensated by regrowth in undisturbed areas. Fires and tree cover area loss generally occurred where summer temperatures were greater than 17.5°C, whereas net tree cover gain often occurred in cooler areas, suggesting that ongoing climate warming is threatening forests in many areas. California's vegetation is undergoing rapid transformation, with disturbance rates and climate change posing substantial potential risks to the integrity of California's terrestrial carbon sink. Numéro de notice : A2022-143 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1029/2021AV000654 Date de publication en ligne : 06/07/2022 En ligne : https://doi.org/10.1029/2021AV000654 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102447 [article]