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Soil Biogeochemical Properties and Microbial Community Composition Under Prescribed Burning in Subtropical Rangelands of Florida
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Soil Biogeochemical Properties and Microbial Community Composition Under Prescribed Burning in Subtropical Rangelands of Florida
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Dissertation
Soil Biogeochemical Properties and Microbial Community Composition Under Prescribed Burning in Subtropical Rangelands of Florida
2020
Overview
Prescribed burning is a common management strategy employed by land managers in Florida native rangelands. Fires can have major effects on soil properties, with subsequent impacts on soil C and N cycling. However, there is not only limited information on the effects of prescribed burning on soil microbial community in subtropical rangelands, but it is also unknown how potential shifts in microbial community are related to fire-induced changes in key soil properties. This research assessed soil nutrients, microbial activity, and microbial community responses immediately after fire. Our study showed that there were effects of prescribed burning on soil properties including soil pH, TC, TN, C:N ratio, NH4+, extractable P and Ca concentrations. Fire affected microbial response including BGA activity and NAG activity which was likely due to the inactivation of enzyme by high soil temperature. Increasing CO2 fluxes following fire were attributed to seasonal shifts rather direct effect of burning. Bacterial and fungal diversity remained unchanged in the short-term after the burning but a significant effect on beta-diversity was observed among the sampling sites. Bacterial and fungal relative abundance revealed no changes after fire at the phylum level. However, at order level, Desulfurellales and Rhizobiales increased while Eurotiales and Pleosporales decreased significantly after fire. Our data indicated that the prescribed burning had a minimal effect on soil microbial abundance and diversity immediately after the burning. Spatial heterogeneity across the sites can be considered as a crucial factor for the variation in microbial community composition than the burning but soil microbial groups could not always be linked to key soil properties. Our meta-analysis results showed a significant effect of wildfire on soil bacterial diversity compared to prescribed burning. Significant effect of fire frequency interval of 4-7 years was observed in overall soil microbial communities with high heterogeneity. However, long term assessment of fire is needed to determine if the effect takes place at different time scales and to evaluate the suitability of prescribed burning in subtropical regions for rangeland management.
Publisher
ProQuest Dissertations & Theses
Subject
ISBN
9798368438436
