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<p>Material input and output are key factors determining the formation and accumulation of soil organic carbon (SOC) in alpine peatlands. The impact of erosion gullies drainage caused by thaw slump on SOC remains unclear. Investigating the SOC spatial differentiation pattern from perspectives of vegetation and hydrothermal conditions can help understand carbon sequestration mechanisms under climate change. This study conducted experiments in drainage alpine peatlands on Zoige Plateau. From undisturbed peatland to the edge of erosion gully, based on water level changes. Four drainage gradient sample plots were designated as follows: undrained (I), lightly drained (II), moderately drained (III), and heavily drained (IV), the effects of community characteristics and soil factors on SOC content at different drainage gradients were studied. Results showed that: Horizontally, the dominant species succession from <i>Carex muliensis</i> (I) to <i>Blysmus sinocompressus</i> (II, III) and <i>Kobresia tibetica</i> (IV), the SOC, soil water content (SWC), C/N, community total biomass (TB), litter count (LC), and root/shoot (R/S) decreased, the soil bulk density (BD), pH, and temperature (ST) increased. Vertically, the SOC in Sample plot I decreased, in Sample plot II, III, and IV initially decreased and then increased. SOC was highly significantly positively correlated with TB, LC, and R/S (<i>p</i> ≤ 0.01). Path analysis indicated that the order of soil factors affecting SOC was SWC &gt; C/N &gt; ST &gt; BD. This study found that drainage influenced hydrological environment of peatlands, community succession altered quantity and quality of material input. These factors disrupted peat accumulation and decomposition balance, changing SOC horizontal and vertical patterns, causing alpine peatlands degradation.</p>

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Effects of Erosion Gully Drainage on Soil Organic Carbon Spatial Differentiation Pattern in Alpine Peatlands

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Xinyu Ma,
  • Xiawei Zhao,
  • Chengzhang Zhao,
  • Lu Zhang,
  • Haolin Li,
  • Yan Wang

摘要

Material input and output are key factors determining the formation and accumulation of soil organic carbon (SOC) in alpine peatlands. The impact of erosion gullies drainage caused by thaw slump on SOC remains unclear. Investigating the SOC spatial differentiation pattern from perspectives of vegetation and hydrothermal conditions can help understand carbon sequestration mechanisms under climate change. This study conducted experiments in drainage alpine peatlands on Zoige Plateau. From undisturbed peatland to the edge of erosion gully, based on water level changes. Four drainage gradient sample plots were designated as follows: undrained (I), lightly drained (II), moderately drained (III), and heavily drained (IV), the effects of community characteristics and soil factors on SOC content at different drainage gradients were studied. Results showed that: Horizontally, the dominant species succession from Carex muliensis (I) to Blysmus sinocompressus (II, III) and Kobresia tibetica (IV), the SOC, soil water content (SWC), C/N, community total biomass (TB), litter count (LC), and root/shoot (R/S) decreased, the soil bulk density (BD), pH, and temperature (ST) increased. Vertically, the SOC in Sample plot I decreased, in Sample plot II, III, and IV initially decreased and then increased. SOC was highly significantly positively correlated with TB, LC, and R/S (p ≤ 0.01). Path analysis indicated that the order of soil factors affecting SOC was SWC > C/N > ST > BD. This study found that drainage influenced hydrological environment of peatlands, community succession altered quantity and quality of material input. These factors disrupted peat accumulation and decomposition balance, changing SOC horizontal and vertical patterns, causing alpine peatlands degradation.