溶解有机碳
腐殖质
环境化学
渗滤液
支流
吸光度
土壤水分
环境科学
化学
有机质
土壤科学
地图学
有机化学
色谱法
地理
作者
Sarah J. Fischer,Timothy S. Fegel,Paul J. Wilkerson,Luis Carlos Carrasco Rivera,Charles C. Rhoades,Fernando L. Rosario‐Ortiz
出处
期刊:ACS ES&T water
[American Chemical Society]
日期:2023-07-31
卷期号:3 (8): 2199-2209
被引量:7
标识
DOI:10.1021/acsestwater.3c00017
摘要
Wildfires generate significant amounts of ash and burned soils that can leach altered dissolved organic matter (DOM) to watersheds. In this work, we analyzed the absorbance and fluorescence spectrum of DOM leached from 40 ash and soil samples collected from two conifer forest burn scars. DOM fluorescence quantum yield at 350 nm (ϕf350) was elevated in all ash and burned soil leachates. Wildfire DOM fluorescence was also consistently shifted toward the ultraviolet (UV) region relative to unburned materials, which limited the utility of several pre-defined optical indices, such as the humification index (HIX) and SUVA254, for wildfire DOM differentiation. In contrast, E2:E3 and ϕf350 resolved differences between ash, burned mineral soil, and unburned soil DOM across an assortment of physical settings. Mixtures of a freshwater DOM reference material and wildfire ash leachate confirmed that specific fluorescence peaks A and C, ϕf350, and E2:E3 were well correlated (R2 > 0.92) to mass increases of ash-derived DOM. These findings were compared to 31 surface water samples collected from burned tributaries within the Cameron Peak Fire burnscar. Surface waters draining from the burn scar were also elevated in ϕf350, E2:E3, SUVA254, FI, and UV-shifted fluorescence peaks A and C at intensities comparable to ash mixing experiments.
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