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Application of 21Pbex inventories to measure net hillslope erosion at burned sites

, : Application of 21Pbex inventories to measure net hillslope erosion at burned sites.

Fallout radionuclides, including lead-21 excess (21Pbex), have been broadly and successfully used to quantify net hillslope sediment transport in agricultural, pastoral and forested landscapes but have only recently been applied in burned terrain. Quantifying post-fire erosion is important because fires can amplify hillslope erosion, impacting terrestrial and aquatic habitat and water quality. However, we lack a basic understanding of the fate of 21Pbex in fires. To address this knowledge gap, we collected over 4 soil samples from unburned, moderately and severely burned forested sites in central Idaho. We measured soil 21Pbex content at stable reference and eroding sites and in mineral and organic soil components. At all sites, organic matter had the highest concentration of 21Pbex, representing 3 to 73% of the total activity. At the severely and moderately burned sites, 21Pbex reference inventories were lower by 58% and 41%, with about 4% less organic mass, relative to the unburned site. These results indicate that most 21Pbex in our semi-arid, forested sites was bound to organic matter, and that a substantial portion of this lead was lost due to forest fires. These losses likely occurred through volatilization and wind transport of smoke and ash. In the moderately burned site, 21Pbex losses were more spatially variable, potentially due to spatially uneven fire intensity and effects. Despite equal percent losses of 21Pbex, lower inventories at the burned sites produced lower calculated net erosion rates relative to the unburned site. Thus, given methodological uncertainties, 21Pbex losses due to fire, and the subsequent sensitivity of calculated net erosion rates to these lower 21Pbex inventories, we suggest this method should not be used in burned terrain to calculate absolute net erosion and deposition rates. However, within a given burned site, 21Pbex inventories still provide useful information describing relative soil losses and storage across the landscape.


DOI: 10.1002/esp.3266

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