Estimating the risk of wildfires in the municipality of Rio Verde, Goiás State, Central Brazil

Revista Brasileira de Ciências Ambientais, Journal Year: 2025, Volume and Issue: 60

Published: March 13, 2025

The damage caused by wildfires has major impacts each year, not only on the environment but also economy and public health. present study aimed at mapping fire risk in different areas of municipality Rio Verde, Central Brazilian state Goiás. A number factors that influence occurrence were considered this analysis, including orientation relief, slope, population density, proximity homes, road network, land cover use. analytical hierarchy process was used to determine appropriate weights for variables. index divided into five classes: water, low, moderate, high, very high risks. Class 4 (high risk) most frequently recorded within area, followed classes 3 (moderate 2 (low risk). Subsequently, heat spots remote sensing related indices, framing verified. Overall, 16.36% low (class 2), while 36.29% classified as moderate 3), 46.72% 4). These findings indicate provides an adequate effective parameter spatial assessment distribution events (controlled burns or wildfires) Verde.

Language: Английский

Quantifying Soil Loss in the Brazilian Savanna Ecosystem: Current Rates and Anticipated Impact of Climate Changes

Land Degradation and Development, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 14, 2024

ABSTRACT The Brazilian Savanna (Cerrado) is the second‐largest South American biome that corresponds to almost two‐third of national agricultural production. Extensive agricultural‐driven land‐use changes have significantly altered landscape, causing increased soil erosion. Furthermore, projections climate change effects on Cerrado raise concerns about potential exacerbation loss and its consequences ecosystem sustainability. This study investigated for by assessing current rates projecting future change. Current was based experimental plots (100 m 2 ) during 7 years maintained under typical main land cover in Brazil (sugarcane, pasture, Cerrado, bare soil). Erosivity, using Universal Soil Loss Equation (USLE), estimated from observations, parameters erodibility, cover. To assess (2100), we used calibrated USLE equation with yearly erosivity derived 12 downscaled bias‐corrected SSP2‐4.5 SSP5‐8.5 scenarios CMIP6 model projections. practices induce considerable erosion, where sugarcane has 3.4 times higher as compared natural Regarding an increase 4.9% 7.6% loss, respectively, all covers. observed underscore critical importance implementing sustainable management mitigate further degradation. Climate may impose additional stress ecosystem, amplifying urgency adaptive measures safeguard this important biome.

Language: Английский

An enemy's enemy is an ally: Competitive indirect interactions mediate coexistence of trees, grasses, and subshrubs in neotropical savanna

Biotropica, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 19, 2024

Abstract Savannas are complex ecosystems where multiple growth forms, including grasses, trees, and subshrubs, coexist through intricate ecological interactions. Understanding the mechanisms that promote this coexistence is key to conserving savanna biodiversity. This study investigated effects of grass competition on survival trees as well interactions between these two forms. Using three species we conducted a greenhouse experiment assess how subshrubs influenced by presence grass. We found significantly reduced tree seedlings, while were unaffected. When competed directly, subshrub biomass was reduced, but only in absence Tree seedling not affected negatively impacted subshrubs. Both root stem competition; however, effect mitigated when simultaneously. These results indicate compete together, intensity promoting contributing balance forms ecosystems. While fire an important factor dynamics, our emphasizes critical role maintaining balance. Future studies should explore interact further understanding biodiversity ecosystem function Neotropical savannas. Portuguese available with online material.

Language: Английский