02268nab a2200289 i 4500 BR-BrBNA 20260407052643.0 260407b2019 bl.qr|pooa||| 00| 0 eng | BR-BrBNA eng K10 U40 Silveira, Eduarda Martiniano de Oliveira Acerbi Júnior, Fausto Weimar Silva, Sérgio Teixeira Mello, José Márcio de Anthropogenic Disturbances Affect the Relationship Between Spectral Indices and the Biometric Variables of Brazilian Savannas Publicação on-line; 49 ref.; 3 tables; 7 illus.; Summary (En) ABSTRACT According to previous studies involving biometric variables modeling using remote sensing (RS), data did not consider the effects of anthropogenic disturbance as relevant factor. The main objective of this study was to model aboveground biomass (AGB) and total wood volume (TWV) of Brazilian Savanna biome using vegetation indices (VI) from LANDSAT 5 TM. Multiple linear regression (MLR) and random forest (RF) algorithm were applied across 641 field plots of cerrado sensu stricto of the state of Minas Gerais, Brazil, comparing two models: non-stratified, and stratified according to plot’s anthropization degree. AGB and TWV obtained from non-anthropized plots presented linear relation with VIs (R2 = 0.82 and 0.74, respectively) and, on the other hand, presented nonlinear relation when plots were affected by anthropogenic disturbances or were not stratified. This finding helps improving estimates by stratifying plots into their anthropization degree, mainly in the Brazilian Savanna biome undergoing anthropogenic disturbances. Keywords: remote sensing, stratification, modeling, wood volume, aboveground biomass. SENSORIAMENTO REMOTO MADEIRA VOLUME CERRADO 2929 347952 Rio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994 2025-0451 Floresta e Ambiente (Brazil) 1415-0980 / ISSN 2179-8087 0nline v. 26(3) p. 1-13; (2019) BR2026000295 https://www.scielo.br/j/floram/a/WsKrzZDmTttYrxdt9HLm9sF/?format=pdf&lang=en ANA 341258 341258