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This study investigates the effects of two invasive plants, Ligularia virgaurea and Anaphalis nepalensis, on soil ecological processes in the alpine meadows of the Qinghai–Tibet Plateau under varying invasion intensities. Results show that soil nutrients (NH₄⁺-N, NO₃⁻-N, total N, organic C, total P) and microbial enzyme activities (e.g., NAG, CBH) decrease with degradation. Ligularia virgaurea invasion leads to higher LAP activity, especially increasing with soil depth, unlike Anaphalis nepalensis, which shows a decrease. Ecological stoichiometric ratios (C:N, C:P, N:P) decline, indicating intensified N and P limitation, with LAP potentially compensating in N cycling. PCA explained 66.1% variance, highlighting key ecological interactions. These findings reveal species-specific impacts on soil nutrient cycling and microbial function, informing management of degraded alpine grasslands and invasive species control on the Qinghai–Tibet Plateau.

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Soil Enzyme Activity and Its Stoichiometric Characteristics During the Formation of Black Soil Patches by Certain Toxic Weeds

  • 会议论文

  • 发表日期：

    2026年

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  • Jiashun Huang,
  • Qiang Zhang,
  • Qiang Ai,
  • Zhengchen Shi

摘要

This study investigates the effects of two invasive plants, Ligularia virgaurea and Anaphalis nepalensis, on soil ecological processes in the alpine meadows of the Qinghai–Tibet Plateau under varying invasion intensities. Results show that soil nutrients (NH₄⁺-N, NO₃⁻-N, total N, organic C, total P) and microbial enzyme activities (e.g., NAG, CBH) decrease with degradation. Ligularia virgaurea invasion leads to higher LAP activity, especially increasing with soil depth, unlike Anaphalis nepalensis, which shows a decrease. Ecological stoichiometric ratios (C:N, C:P, N:P) decline, indicating intensified N and P limitation, with LAP potentially compensating in N cycling. PCA explained 66.1% variance, highlighting key ecological interactions. These findings reveal species-specific impacts on soil nutrient cycling and microbial function, informing management of degraded alpine grasslands and invasive species control on the Qinghai–Tibet Plateau.