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Purpose <p>Escalating wildfire frequency and intensity pose a significant threat to global ecosystems. However, the intricate interactions between plant species and wildfire intensity on microbial metabolism and carbon dynamics in post-fire forest soils remain largely uncharacterized.</p> Methods <p>This study focused on three dominant plant species (<i>Sophora davidii</i>, <i>Quercus aquifolioides</i>, and <i>Pinus densata</i>) in an alpine forest on the eastern Tibetan Plateau. Extracellular enzyme activities involved in the acquisition of carbon (C), nitrogen (N), and phosphorus (P), alongside microbial metabolism limitations and C use efficiency (CUE), were examined in bulk soils (BS) and root-zone soils (RS) across three wildfire intensities.</p> Results <p>We observed divergent responses of enzyme activities to wildfire between BS and RS. In BS, wildfire reduced C-acquiring enzyme activity, while in RS, enzyme activity shifts were contingent on plant species and wildfire intensities. These wildfire-induced changes revealed an alleviation of microbial C limitation in BS but an intensification of P limitation in RS. This exacerbated P limitation was linked to declined bioavailable P concentrations and elevated ratios of available N to P. Notably, microbial CUE in BS increased with wildfire intensity, while in RS, plant species-specific effects on soil and microbial properties mitigate this response.</p> Conclusions <p>Our findings reveal the critical role of plant species in shaping wildfire-induced changes in soil enzyme activities and microbial C allocation, underscoring the necessity of incorporating plant identity and wildfire intensity into predictive models to forecast the consequences of post-fire microbial nutrient cycling and global C dynamics.</p>

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Specific alterations of plant species on extracellular enzyme activities and potential microbial nutrient limitation in post-fire forest soils of eastern Tibetan plateau

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Dongyan Zhao,
  • Yi Wu,
  • Yuhan Wang,
  • Yuying Wu,
  • Wenzheng Yang,
  • Peihao Peng,
  • Yanhong Wu,
  • Jipeng Wang,
  • Binod Pokharel,
  • Roland Bol,
  • Haijian Bing

摘要

Purpose

Escalating wildfire frequency and intensity pose a significant threat to global ecosystems. However, the intricate interactions between plant species and wildfire intensity on microbial metabolism and carbon dynamics in post-fire forest soils remain largely uncharacterized.

Methods

This study focused on three dominant plant species (Sophora davidii, Quercus aquifolioides, and Pinus densata) in an alpine forest on the eastern Tibetan Plateau. Extracellular enzyme activities involved in the acquisition of carbon (C), nitrogen (N), and phosphorus (P), alongside microbial metabolism limitations and C use efficiency (CUE), were examined in bulk soils (BS) and root-zone soils (RS) across three wildfire intensities.

Results

We observed divergent responses of enzyme activities to wildfire between BS and RS. In BS, wildfire reduced C-acquiring enzyme activity, while in RS, enzyme activity shifts were contingent on plant species and wildfire intensities. These wildfire-induced changes revealed an alleviation of microbial C limitation in BS but an intensification of P limitation in RS. This exacerbated P limitation was linked to declined bioavailable P concentrations and elevated ratios of available N to P. Notably, microbial CUE in BS increased with wildfire intensity, while in RS, plant species-specific effects on soil and microbial properties mitigate this response.

Conclusions

Our findings reveal the critical role of plant species in shaping wildfire-induced changes in soil enzyme activities and microbial C allocation, underscoring the necessity of incorporating plant identity and wildfire intensity into predictive models to forecast the consequences of post-fire microbial nutrient cycling and global C dynamics.