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Background and aims <p>Soil carbon in alpine wetlands represents a substantial carbon reservoir and plays a disproportionately large role in the global carbon cycle. Grazing management strongly affects carbon sequestration, particularly through the coupling of soil organic carbon (SOC) and soil inorganic carbon (SIC). However, the pathways linking vegetation and soil changes to SOC and SIC dynamics remain unclear, and elucidating them is crucial for guiding sustainable grazing practices.</p> Methods <p>We surveyed 12 wetland sites in Zoige Plateau, China, under three grazing intensities using a transect-quadrat approach and measured aboveground and root biomass, their carbon, nitrogen, phosphorus contents, and soil physicochemical properties. Variance partitioning analysis (VPA), redundancy analysis (RDA), and structural equation modeling (SEM) were used to examine the relationships among community characteristics, root traits, soil properties, and SOC and SIC.</p> Results <p>SOC and SIC were strongly positively correlated. Combined effects of community characteristics, root traits, and soil properties explained most variation in soil total carbon (STC), SOC, and SIC contents. Grazing influenced SOC-SIC coupling by altering plant communities, soil nutrients, root traits, and electrical conductivity (EC), and by modulating interactions between aboveground plant nutrients and root traits. EC played a key regulatory role across community characteristics, root traits, and soil properties.</p> Conclusion <p>Our findings confirm that SOC and SIC exhibit a significant positive synergy, primarily regulated by multi-interface interactions within the community-root-soil system. The findings provide new theoretical and practical insights for carbon reservoir management in alpine wetlands, offering valuable guidance for sustainable ecosystem management.</p>

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Integrated controls of soil and vegetation dynamics on soil organic and inorganic carbon covariation in grazed alpine wetlands

  • 期刊论文

  • 发表日期：

    2025年10月11日

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  • Yifan Li,
  • Mingye Zhang,
  • Yu An,
  • Le Wang,
  • Xianglong Xing,
  • Shouzheng Tong,
  • Haitao Wu,
  • Ming Jiang,
  • Kaishan Song

摘要

Background and aims

Soil carbon in alpine wetlands represents a substantial carbon reservoir and plays a disproportionately large role in the global carbon cycle. Grazing management strongly affects carbon sequestration, particularly through the coupling of soil organic carbon (SOC) and soil inorganic carbon (SIC). However, the pathways linking vegetation and soil changes to SOC and SIC dynamics remain unclear, and elucidating them is crucial for guiding sustainable grazing practices.

Methods

We surveyed 12 wetland sites in Zoige Plateau, China, under three grazing intensities using a transect-quadrat approach and measured aboveground and root biomass, their carbon, nitrogen, phosphorus contents, and soil physicochemical properties. Variance partitioning analysis (VPA), redundancy analysis (RDA), and structural equation modeling (SEM) were used to examine the relationships among community characteristics, root traits, soil properties, and SOC and SIC.

Results

SOC and SIC were strongly positively correlated. Combined effects of community characteristics, root traits, and soil properties explained most variation in soil total carbon (STC), SOC, and SIC contents. Grazing influenced SOC-SIC coupling by altering plant communities, soil nutrients, root traits, and electrical conductivity (EC), and by modulating interactions between aboveground plant nutrients and root traits. EC played a key regulatory role across community characteristics, root traits, and soil properties.

Conclusion

Our findings confirm that SOC and SIC exhibit a significant positive synergy, primarily regulated by multi-interface interactions within the community-root-soil system. The findings provide new theoretical and practical insights for carbon reservoir management in alpine wetlands, offering valuable guidance for sustainable ecosystem management.