Wildfires mediate carbon transfer from land to lakes across boreal and temperate regions

Communications Earth & Environment, Journal Year: 2025, Volume and Issue: 6(1)

Published: Feb. 8, 2025

Wildfires can disrupt carbon transport from land to water, but how lake cycling responds fires remains unclear. Here, we analyzed the concentration and dominance of main forms in total pools 54 lakes (34 burned, 20 control) across 3 regions Quebec, Canada Minnesota, USA recent wildfires ( < 1 – years). Lakes burned watersheds had up double dissolved organic concentrations control lakes, fire effect was most apparent when accounting for climate landscape drivers (e.g., catchment area ratio) cycling. The greater quantity over other with different turnover rates fates suggest a potential fire-mediated export several years post yet undetermined fate northern forested important implications regional global budgets. increase by double, mostly form carbon, according analyses fire-disturbed Quebec Minnesota.

Language: Английский

Toxicological screening of PM2.5 from wildfires involving different biomass fuels

Environmental Pollution, Journal Year: 2025, Volume and Issue: unknown, P. 125887 - 125887

Published: Feb. 1, 2025

Wildfires are becoming increasingly frequent and severe, particularly in Southern Europe. In addition to their immediate environmental socioeconomic impacts, wildfires release significant amounts of particulate matter (PM), which poses serious health ecological risks. Gaseous (CO CO2) PM2.5 samples were collected directly from smoke plumes, the modified combustion efficiency (MCE) was calculated characterise conditions. This study aims assess cytotoxicity, mutagenicity ecotoxicity during Portugal, with a focus on how varying biomass types conditions impact these effects. Ecotoxicity assessments using Aliivibrio fischeri showed that ranged toxic extremely toxic, mixed vegetation burns (eucalyptus, acacia, ferns) exhibiting highest toxicity levels. Cytotoxicity tests human lung epithelial cells (A549) demonstrated dose-dependent decrease metabolic activity no membrane damage, while assays identified direct-acting mutagens smouldering acacia debris combustion, specifically inducing frameshift mutations Salmonella typhimurium strain TA98. Root growth inhibition toxicity, some samples, instead, promoting probably due nutrient content. Peroxidase responses indicated that, at higher concentrations, enzyme function could be reduced if defence mechanisms overwhelmed or stimulated high These findings highlight complex toxicological profiles wildfire PM, emphasising need for further research.

Language: Английский

Wildfires under changing climate, and their environmental and health impacts

Journal of Soils and Sediments, Journal Year: 2025, Volume and Issue: unknown

Published: April 8, 2025

Abstract Purpose Extreme weather events including drought, flooding, and wildfires resulting from climate change can impact ecosystems. Various toxic substances are emitted during wildfires, such as particulate matter volatile organic compounds, the frequency intensity of rise with change. This review aims to focus on effects environmental health covering contaminants in soil, aquatic atmospheric environment. Materials methods A thorough literature search was conducted Web Science Core Collections following keywords: “wildfire” OR “volatile compounds” “pollution” “contamination” “terrestrial pollution” “aquatic “atmospheric pollution”. PRISMA flow chart used highlight review's content provide a more synthesis relevant studies. Results discussion studies have shown how wildfire emissions affect public health, although handful information available regarding impacts smoke wildfires. The post-wildfire trace elemental concentrations speciation notably linked plant species, geology, topography. Recent found increased levels nitrogen (N), phosphorus (P), dissolved carbon (DOC), suspended solids, water turbidity lakes within wildfire-burnt watersheds. response individual ecosystems depends proximity fire, fire characteristics, fuel fee material burned, effect fundamental drivers quality. Conclusions findings this will encourage strengthen collaboration between scientific community regulatory agencies better understand erratic events, may people animals. Graphical

Language: Английский