Journal
FOREST ECOLOGY AND MANAGEMENT
Volume 541, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.foreco.2023.121067
Keywords
Forest fire; Microbial community; Miseq sequencing; 15N dilution; Nitrogen transformation; Substrate availability
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This study used 15N dilution and Miseq sequencing techniques to investigate the impact of fire history on soil nutrient availability, microbial traits, and gross N mineralization rates at five forest sites. The results showed that fire had both positive and negative effects on soil gross N mineralization, depending on the soil texture. Fire increased gross N mineralization rates in fine-textured soils, but decreased them in coarse-textured soils. This study provides insights into the complex mechanisms of how fire affects soil gross N mineralization in forest ecosystems.
Wildfire is a primary disturbance of forests and has been expected to influence soil nitrogen (N) transformation. However, the effect of fire on soil gross N mineralization is still under debate. This study used the 15N dilution and Miseq sequencing techniques to examine the impact of fire history on soil nutrient availability, microbial traits, and gross N mineralization rates at five forest sites. Results showed that fire had both positive and negative effects on soil gross N mineralization, depending on sampling sites. Fire promoted gross N mineralization rates by 41-49% in fine-textured soils by increasing dissolved organic C and N concentrations, microbial abundances, and microbial interactions (connectance of microbial co-occurrence networks) in soil. In contrast, fire decreased the rates by 24-44% in coarse-textured soils by reducing the above measurements. The results suggest that the effect of fire on soil gross N mineralization is regulated by soil texture. This study provides insights into the complex mechanisms of how fire affects soil gross N mineralization in forest ecosystems.
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