【摘要】 以黄河源区高寒草甸土壤为研究对象，对高寒草甸退化与恢复不同演替阶段土壤有机碳碳储量及其影响因素进行了研究。结果表明，草甸退化使植被地上/根系生物量和植被盖度显著下降（P <0.05），表层（0～10 cm）土壤pH和容重显著增加（P <0.05），土壤全氮和全磷含量显著降低（P <0.05）。与天然草甸嵩草斑块（NKP）相比，退化裸土斑块（DBSP）土壤表层有机碳储量（SOCD）平均显著下降32.18%(P <0.05)，亚表层平均下降8.37%，自然恢复（NRKP）后SOCD略有增加，人工修复草地（ARGP）的SOCD显著增加（P <0.05）,0～20 cm土层SOCD较退化时平均增加18.11%。土壤有机碳含量是SOCD变化最重要的驱动因子，其次是土壤容重。土壤pH、全氮和全磷与土壤有机碳均呈极显著相关（P <0.01），对高寒草甸不同演替阶段SOCD变化也具有重要影响。更多还原

【Abstract】 Focusing on the alpine meadow soils in the Yellow River Source region, this study investigates the changes in soil organic carbon(SOC) storage across different soil layers during the degradation and restoration succession of alpine meadows, as well as the influencing factors. The results show that meadow degradation significantly reduces aboveground/root biomass and vegetation coverage, while increasing soil pH and bulk density in the surface layer(0-10cm). Soil total nitrogen and phosphorus contents decrease significantly(P<0.05). Compared to natural meadows(NKP), soil organic carbon density(SOCD) in the surface layer during degradation(DBSP)significantly decreases by 32.18%(P<0.05), with a decrease of 8.37% in the sub-surface layer. Natural recovery(NRKP) leads to a slight increase in SOCD, while artificial restoration(ARGP) results in a significant increase, with the 0-20cm SOCD rising by 18.11% on average compared to the degraded state. The content of soil organic carbon is the most important driver of SOCD change, followed by soil bulk density. Soil pH, total nitrogen, and total phosphorus are significantly correlated with soil organic carbon(P<0.01), indicating their important influence on SOCD changes during different succession stages of alpine meadows.更多还原