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Boise State University (2021)

Fire Effects on Soil Properties : Amending Post-Fire Soils with Native Microbial Communities and Biochar to Improve Sagebrush Performance

Schuler, Sabrina Marie

Titre : Fire Effects on Soil Properties : Amending Post-Fire Soils with Native Microbial Communities and Biochar to Improve Sagebrush Performance

Auteur : Schuler, Sabrina Marie,

Université de soutenance : Boise State University

Grade : Master of Science (MS) in Biology 2021

Résumé partiel
Within the sagebrush steppe, fire has been shown to affect biogeochemical properties and the microbial community composition in soils. However, there is uncertainty about the magnitude and direction of these effects, since they vary by sites that differ in abiotic and biotic conditions. Moreover, differences in post-fire management strategies are likely to mediate the effect of fire on soil properties, thus further compounding this uncertainty. Any changes in soil biogeochemical properties following fire can prevent successful restoration of Artemisia tridentata sp. wyomingensis (sagebrush), leading to variable outcomes of restoration success in the sagebrush steppe. Previous research has shown that addition of native soil microbes and biochar can improve ecosystem restoration efforts, but the effects of these soil amendments on post-fire soil properties and sagebrush performance across sites are uncertain. With this study, I investigated how fire impacts soil properties (i.e., soil organic matter (SOM), soil structure, carbon (C) and nitrogen (N) concentrations, soil pH, net mineral N, microbial richness and composition) at a variety of sites that differ in time since exposure to fire, post-fire plant communities, and post-fire site management. I then implemented a greenhouse study to evaluate how amending soils with native microbial community inocula and biochar impact soil properties of the post-burn sites and sagebrush germination and growth. Taken together, these findings capture the influences of multiple fires and separate management strategies on soil properties, and how certain soil amendments may redirect soil recovery to aid in sagebrush restoration

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Page publiée le 12 décembre 2022