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Inventorying management status and plant species richness in seminatural grasslands using high spatial resolution imagery / K. Hall in Applied Vegetation Science, vol 13 n° 2 (April 2010)  

Public [article]  inApplied Vegetation Science > vol 13 n° 2 (April 2010) . - pp 221 - 233 Titre : Inventorying management status and plant species richness in seminatural grasslands using high spatial resolution imagery Type de document : Article/Communication Auteurs : K. Hall, Auteur ; L.J. Johansson, Auteur ; M.T. Sykes, Auteur ; T. Reitalu, Auteur ; K. Larsson, Auteur ; H.C. Prentice, Auteur Année de publication : 2010 Article en page(s) : pp 221 - 233 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Baltique, mer [Termes IGN] broussaille [Termes IGN] carte de la végétation [Termes IGN] île [Termes IGN] image Quickbird [Termes IGN] modèle numérique de terrain [Termes IGN] paturage [Termes IGN] phytosociologie [Termes IGN] prairie [Termes IGN] richesse floristique [Termes IGN] Suède [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) Question: Can we reliably estimate grazing intensity, indicators of grazing intensity (i.e. field-layer height and shrub-cover), and vascular plant species richness in semi-natural grasslands from high spatial resolution satellite data? Location: The Baltic Island of Öland (Sweden). Methods: Fieldwork included the on-site description of grazed and ungrazed areas and shrub-cover within 107 semi-natural grassland sites. Field-layer height and vascular plant species richness (total within-site and mean small-scale species richness) were recorded within the sites. Digital classification of QuickBird data was performed to identify grazed and ungrazed areas and shrub-cover. Vegetation indices were generated to analyze the performance of satellite data for estimating field-layer height, and the spectral heterogeneity was used to characterize the within-site environmental heterogeneity. Results: The proportion of digitally classified grazed area explained 45% of the variation in field-layer height and 43% of the variation in shrub-cover. Field-layer height was significantly related to vegetation indices. A linear model with three explanatory variables (spectral richnessred, spectral richnessNIR, and shrub-cover) explained 47% of the variation in total within-site species richness. Conclusions: High spatial resolution imagery may assist in the monitoring of the processes that follow the cessation of grazing, on the scale of individual grassland sites. Measures of spectral heterogeneity acquired by high spatial resolution imagery can be used in the assessment of total within-site vascular plant species richness in semi-natural grassland vegetation. Numéro de notice : A2010-001 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/FORET Nature : Article DOI : 10.1111/j.1654-109X.2009.01063.x En ligne : https://doi.org/10.1111/j.1654-109X.2009.01063.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81090 [article]