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Background <p>Alpine grasslands on the Tibetan Plateau constitute a pivotal component of the global carbon cycle. As the dominant CO₂ flux pathway, soil respiration demonstrates marked sensitivity to both climate warming and anthropogenic disturbances.</p> Methods <p>Based on a long-term experiment combining warming (open-top chambers) and mowing (annual clipping), we systematically monitored soil respiration rates, concurrently with soil temperature and moisture, plant community traits, and soil nutrient, to elucidate the responses patterns of alpine meadow soil respiration to warming and mowing and identify their dominant drivers.</p> Results <p>Soil respiration was significantly affected by the main effects of warming and mowing (<i>P</i> &lt; 0.05) and was strongly correlated with soil temperature and moisture. <i>Q₁₀</i> decreased by 5.04% in M*NW to 8.98% in NM*W, while the fitting strength (R<sup>2</sup>) between soil respiration and soil moisture increased from 73% (NM*W) to 146% (M*W). Soil respiration was significantly correlated with the dominance of Grass and showed quadratic relationships with ammonium nitrogen, available phosphorus, and microbial biomass carbon (<i>P</i> &lt; 0.05). Structural equation modelling indicated strong positive associations between soil nutrients and microbial biomass, and revealed that soil moisture had a significant positive effect on soil respiration (<i>P</i> &lt; 0.001).</p> Conclusion <p>This study demonstrates that the effects of long-term warming and mowing on soil respiration are largely independent, indirectly influencing soil respiration by altering the dominance of plant functional groups, while soil moisture emerges as the primary regulator, surpassing temperature. Moreover, nutrient–microbe interactions constitute the key pathways through which warming and mowing affect soil respiration.</p>

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Long-term warming and mowing shift the dominant control of soil respiration in an alpine meadow of the Tibet Plateau

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Li Ma,
  • Huifang Shi,
  • Hongye Su,
  • Xue Hu,
  • Shan Li,
  • Qiang Zhang,
  • Jingjing Wei,
  • Sheng Xu,
  • Zhonghua Zhang,
  • Zhengchen Shi,
  • Zhen Wang,
  • Yingcheng Wang,
  • Bingrong Zhou,
  • Huakun Zhou

摘要

Background

Alpine grasslands on the Tibetan Plateau constitute a pivotal component of the global carbon cycle. As the dominant CO₂ flux pathway, soil respiration demonstrates marked sensitivity to both climate warming and anthropogenic disturbances.

Methods

Based on a long-term experiment combining warming (open-top chambers) and mowing (annual clipping), we systematically monitored soil respiration rates, concurrently with soil temperature and moisture, plant community traits, and soil nutrient, to elucidate the responses patterns of alpine meadow soil respiration to warming and mowing and identify their dominant drivers.

Results

Soil respiration was significantly affected by the main effects of warming and mowing (P < 0.05) and was strongly correlated with soil temperature and moisture. Q₁₀ decreased by 5.04% in M*NW to 8.98% in NM*W, while the fitting strength (R2) between soil respiration and soil moisture increased from 73% (NM*W) to 146% (M*W). Soil respiration was significantly correlated with the dominance of Grass and showed quadratic relationships with ammonium nitrogen, available phosphorus, and microbial biomass carbon (P < 0.05). Structural equation modelling indicated strong positive associations between soil nutrients and microbial biomass, and revealed that soil moisture had a significant positive effect on soil respiration (P < 0.001).

Conclusion

This study demonstrates that the effects of long-term warming and mowing on soil respiration are largely independent, indirectly influencing soil respiration by altering the dominance of plant functional groups, while soil moisture emerges as the primary regulator, surpassing temperature. Moreover, nutrient–microbe interactions constitute the key pathways through which warming and mowing affect soil respiration.