Data/hora: 20/06/2024 20:34:59

Biblioteca(s): 	Embrapa Amazônia Oriental.	
Data corrente: 	22/04/2020	
Data da última atualização: 	28/12/2023	
Autoria: 	BOURGOIN, C.; BETBEDER, J.; COUTERON, P.; BLANC, L.; DESSARD, H.; OSZWALD, J.; LE ROUX, R.; CORNU, G.; REYMONDIN, L.; FREITAS, L. J. M. de; SIST, P.; LÄDERACH, P.; GOND, V.	
Afiliação: 	Clément Bourgoin, CIRAD / Univ Montpellier / CIAT; Julie Betbeder, CIRAD / Univ Montpellier / CATIE; Pierre Couteron, UMR AMAP-IRD; Lilian Blanc, CIRAD / Univ Montpellier; Hélène Dessard, CIRAD / Univ Montpellier; Johan Oszwald, Université de Rennes 2; Renan Le Roux, CIRAD / Univ Montpellier; Guillaume Cornu, CIRAD / Univ Montpellier; Louis Reymondin, CIAT; LUCAS JOSE MAZZEI DE FREITAS, CPATU; Plinio Sist, CIRAD / Univ Montpellier; Peter Läderach, CIAT; Valéry Gond, CIRAD / Univ Montpellier.	
Título: 	UAV-based canopy textures assess changes in forest structure from long-term degradation.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Ecological Indicators, v. 115, 106386, Aug. 2020.	
DOI: 	https://doi.org/10.1016/j.ecolind.2020.106386	
Idioma: 	Inglês	
Conteúdo: 	Degraded tropical forests dominate agricultural frontiers and their management is becoming an urgent priority. This calls for a better understanding of the different forest cover states and cost-efficient techniques to quantify the impact of degradation on forest structure. Canopy texture analyses based on Very High Spatial Resolution (VHSR) optical imagery provide proxies to assess forest structures but the mechanisms linking them with degradation have rarely been investigated. To address this gap, we used a lightweight Unmanned Aerial Vehicle (UAV) to map 739 ha of degraded forests and acquire both canopy VHSR images and height model. Thirty-three years of degradation history from Landsat archives allowed us to sample 40 plots in undisturbed, logged, over-logged and burned and regrowth forests in tropical forested landscapes (Paragominas, Pará, Brazil). Fourier (FOTO) and lacunarity textures were used to assess forest canopy structure and to build a typology linking degradation history and current states. Texture metrics capture canopy grain, heterogeneity and openness gradients and correlate with forest structure variability (R2 = 0.58). Similar structures share common degradation history and can be discriminated on the basis of canopy texture alone (accuracy = 55%). Over-logging causes a lowering in forest height, which brings homogeneous textures and of finer grain. We identified the major changes in structures due to fire following logging which changes heterogeneous and intermediate grain into coarse textures. Our findings highlight the potential of canopy texture metrics to characterize degraded forests and thus be used as indicators for forest management and degradation mitigation. Inexpensive and agile UAV open promising perspectives at the interface between field inventory and satellite characterization of forest structure using texture metrics.	
Palavras-Chave: 	Degradação florestal.	
Thesagro: 	Degradação Ambiental; Floresta Tropical; Sensoriamento Remoto.	
Thesaurus Nal: 	Remote sensing; Texture; Tropical forests.	
Categoria do assunto: 	K Ciência Florestal e Produtos de Origem Vegetal	
Registro original: 	Embrapa Amazônia Oriental (CPATU)	
Exemplares: 	CPATU - (56357-1) - UPC - AP - DD -  -  -  - DIS