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<p>(Purpose) In order to elucidate the effects of Seasonal rest grazing on the stability of soil organic carbon pools and its driving mechanism in alpine grasslands, (Materials and methods) this study was conducted on alpine grassland with 5 years of seasonal rest grazing, indicators of soil organic carbon pool stability were analyzed using one-way ANOVA, redundancy analysis and structural equations. (Results and discussion) The results show that (1) Seasonal rest grazing significantly increased (<i>P</i> &lt; 0.05) the above-ground and below-ground biomass, apoplastic volume, average height and total cover of alpine grassland vegetation, increased the diversity of vegetation communities, increased the importance values of the functional groups of alpine grassland plants in the families Leguminosae, Graminae and Salicaceae, and significantly decreased the importance values of miscellaneous grasses (<i>P</i> &lt; 0.05). (2) Soil pH, soil bulk density (BD), organic carbon (SOC), readily oxidizable organic carbon (ROC), total nitrogen (TN), total phosphorus (TP), and total potassium (TK) of alpine grassland after seasonal rest grazing were reduced compared to traditional grazing, respectively 1.76%-3.21%、37.23%-50.28%、9.38%-14.40%、27.08%-46.85%、6.31%-42.22%、29.27%-63.64% and 8.22%-19.71%, The soil water content (SW) increased by 21.06% -55.60%. (3) Compared with traditional grazing, seasonal rest grazing reduces soil carbon pool activity and increases organic carbon spatial stability in alpine grasslands, that is, Soil carbon pool activity (A), carbon pool activity index (AI), carbon pool index (CPI) and carbon active and efficency (ACC) significantly decreased by 27.48%-56.32%, 52.62%-75.86%, 16.09%-23.88% and 16.59%-44.54% (<i>P</i> &lt; 0.05) after seasonal rest grazing, while soil carbon pool management index (CPMI), spatial stability of organic carbon (SOCS), Fe-bound organic carbon (OC-Fe) and OC-Fe/SOC significantly increased by 277.97%-442.92%, 208.54%-239.66%, 11.22%-29.54% and 29.28%-36.90% (<i>P</i> &lt; 0.05). (4) Redundancy analysis showed that, seasonal rest grazing reduced the contributions of SOC, ROC, TN and BD to soil carbon pool stability and increased the contributions of Fe-bound organic carbon (OC-Fe), TP, TK and Carbon active and efficency (ACC). Structural equation modeling further suggested that seasonal rest grazing improved the stability of soil carbon pools against changes in the external environment (Altitude). (Conclusions) In conclusion, the 5-year seasonal rest grazing improved the soil environment, reduced the activity of soil carbon pools, and enhanced the stability of SOC pools, and the seasonal rest grazing increased the weights of the effects of soil physical and chemical properties and vegetation characteristics on the stability of soil carbon pools.</p>

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Analysis of the effects of seasonal rest grazing on the stability of soil organic carbon pools and its driving factors in alpine grasslands of Northern Xizang

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Hong Yang,
  • Zongjiu Sun,
  • Qingxin Lu,
  • Wenyu Gao,
  • Youzhi Bai

摘要

(Purpose) In order to elucidate the effects of Seasonal rest grazing on the stability of soil organic carbon pools and its driving mechanism in alpine grasslands, (Materials and methods) this study was conducted on alpine grassland with 5 years of seasonal rest grazing, indicators of soil organic carbon pool stability were analyzed using one-way ANOVA, redundancy analysis and structural equations. (Results and discussion) The results show that (1) Seasonal rest grazing significantly increased (P < 0.05) the above-ground and below-ground biomass, apoplastic volume, average height and total cover of alpine grassland vegetation, increased the diversity of vegetation communities, increased the importance values of the functional groups of alpine grassland plants in the families Leguminosae, Graminae and Salicaceae, and significantly decreased the importance values of miscellaneous grasses (P < 0.05). (2) Soil pH, soil bulk density (BD), organic carbon (SOC), readily oxidizable organic carbon (ROC), total nitrogen (TN), total phosphorus (TP), and total potassium (TK) of alpine grassland after seasonal rest grazing were reduced compared to traditional grazing, respectively 1.76%-3.21%、37.23%-50.28%、9.38%-14.40%、27.08%-46.85%、6.31%-42.22%、29.27%-63.64% and 8.22%-19.71%, The soil water content (SW) increased by 21.06% -55.60%. (3) Compared with traditional grazing, seasonal rest grazing reduces soil carbon pool activity and increases organic carbon spatial stability in alpine grasslands, that is, Soil carbon pool activity (A), carbon pool activity index (AI), carbon pool index (CPI) and carbon active and efficency (ACC) significantly decreased by 27.48%-56.32%, 52.62%-75.86%, 16.09%-23.88% and 16.59%-44.54% (P < 0.05) after seasonal rest grazing, while soil carbon pool management index (CPMI), spatial stability of organic carbon (SOCS), Fe-bound organic carbon (OC-Fe) and OC-Fe/SOC significantly increased by 277.97%-442.92%, 208.54%-239.66%, 11.22%-29.54% and 29.28%-36.90% (P < 0.05). (4) Redundancy analysis showed that, seasonal rest grazing reduced the contributions of SOC, ROC, TN and BD to soil carbon pool stability and increased the contributions of Fe-bound organic carbon (OC-Fe), TP, TK and Carbon active and efficency (ACC). Structural equation modeling further suggested that seasonal rest grazing improved the stability of soil carbon pools against changes in the external environment (Altitude). (Conclusions) In conclusion, the 5-year seasonal rest grazing improved the soil environment, reduced the activity of soil carbon pools, and enhanced the stability of SOC pools, and the seasonal rest grazing increased the weights of the effects of soil physical and chemical properties and vegetation characteristics on the stability of soil carbon pools.