Sediment source apportionment following wildfire in an upland commercial forest catchment
نویسندگان
چکیده
Wildfires can have major impacts on water scarcity and quality linked to off-site transfer of polluting ash nutrients. Understanding sediment sources in burnt landscapes help develop mitigation strategies, especially catchments planted with introduced species that are prone fire. We investigated activated by post-fire rainfall a small-forested catchment was impacted severe wildfire. The aim use environmental radionuclides elemental geochemistry as tracers apportion within plantation systems. Surficial (0–2 cm) topsoil (n = 9), sub-surficial (2–4 (i.e. below the layer; n 8) samples from hillslopes forest roads 5) stream banks soil were taken Quivolgo catchment, El Maule region, Chile. Sediment 9) collected behind v-notched weir three dates after fire: May 2017, July 2017 October 2017. Soil analysed gamma spectrometry wavelength-dispersive X-ray fluorescence (WD-XRF) used obtain tracer properties. These evaluated visually statistically identify potential non-conservative tracers. apportionment undertaken using MixSIAR mixing model. selection procedure resulted ten being for apportionment. Tracer suitability based (i) weak non-significant linear relationship between concentrations specific surface area (SSA) organic matter (SOM), (ii) conservative behaviour supported inclusion source convex hull. Sediments sub-surface layer dominant during first two periods contributing 55 ± 11 78 10% respectively, whereas road contribution only important last period (71 14%). Apportionment showed shift hillslopes) compared previous study same before main driver erosion attributed overland flow convergence consequent rill across hillslopes. demonstrated combined plantations highlighted switch predominant (e.g. soil) events. findings this research will companies strategies reduce release wildfire plantations.
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ژورنال
عنوان ژورنال: Journal of Soils and Sediments
سال: 2021
ISSN: ['1614-7480', '1439-0108']
DOI: https://doi.org/10.1007/s11368-021-02943-w