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Physical and Chemical Properties of Fire-Affected Soils from the Sagebrush Ecosystem of the Western US: A Laboratory Study
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Physical and Chemical Properties of Fire-Affected Soils from the Sagebrush Ecosystem of the Western US: A Laboratory Study
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Journal Article
Physical and Chemical Properties of Fire-Affected Soils from the Sagebrush Ecosystem of the Western US: A Laboratory Study
2025
Overview
This study aims to understand the effects of wildfires in sagebrush ecosystem on soil properties by examining connections between Soil Water Repellency (SWR), reflectance, and chemistry. Ash and burned soil samples were collected after performing laboratory burns of three common sagebrush plants: sagebrush, rabbitbrush, and bitterbrush. The collected samples were analyzed for their physical properties, including SWR measured by Water Drop Penetration Time (WDPT) and Apparent Contact Angle (ACA), and solar spectral reflectance in the wavelength range of 350 to 2500 nm. Chemical functional groups of the samples were analyzed using Fourier-Transform Infrared (FTIR) spectroscopy. WDPT and ACA values were in the range of 1 to 600 s and ~10° to 88°, respectively, for all three tested fuels. The FTIR analysis showed a decrease (~2 to 4 times) in the ratio of COO−/C=C signals for the burned soil samples compared to the unburned soil samples. Overall, increase in temperature and ACA levels for the samples of burned and burned soil from a 2 cm depth led to increased formation of non-polar compounds with C=C functional groups, and decarboxylation.
Publisher
MDPI AG
Subject
