围栏禁牧对滇西北高寒湿地土壤活性有机碳的影响

过度放牧导致滇西北高寒湿地碳汇功能逐渐丧失，围栏禁牧作为一种有效的湿地恢复方式，其对滇西北高寒湿地土壤碳库的影响尚缺乏研究。为探明围栏禁牧对滇西北高寒湿地土壤活性有机碳的影响，以纳帕海湿地不同禁牧年限(未禁牧、禁牧3年、禁牧8年、禁牧10年)的草甸和沼泽化草甸作为研究对象，对比分析不同禁牧年限草甸和沼泽化草甸土壤总有机碳(TOC)、颗粒有机碳(POC)、溶解性有机碳(DOC)、易氧化有机碳(EOC)和微生物生物量碳(MBC)含量特征。研究结果表明，随着禁牧年限的增加(<10 a),草甸和沼泽化草甸土壤TOC、DOC、EOC、MBC含量显著增加(P<0.05);随着土壤深度的增加，草甸和沼泽化草甸土壤TOC、EOC和MBC含量逐渐下降，而POC和DOC含量逐渐增加。土壤理化性质显著影响土壤活性有机碳各组分含量，其中总氮(TN)是影响草甸和沼泽化草甸土壤活性有机碳各组分含量的主导因素。围栏禁牧有利于滇西北高寒湿地土壤质量和固碳能力的恢复，且随着禁牧年限的增加，恢复效果越明显。相同恢复年限，纳帕海沼泽化草甸土壤恢复效果比草甸土壤显著。研究可以为放牧湿地恢复研究提供理论基础。

Effect of fenced grazing on soil active organic carbon in Napahai Wetland

Overgrazing has led to the gradual loss of the carbon sink function of the alpine wetland in Northwest Yunnan. As an effective wetland restoration method, the fenced grazing prohibition has not been studied on its impact on the soil carbon pool in the alpine wetland in Northwest Yunnan. In order to explore the impact of the fenced grazing prohibition on soil active organic carbon in the alpine wetland in Northwest Yunnan, the different grazing prohibition periods (no grazing, grazing prohibition for 3 years, grazing prohibition for 8 years, and grazing prohibition for 10 years) meadows and swampy meadows were used in the Napahai Wetland. Meadows and swamps are used as the research objects to compare and analyze the content characteristics of the total organic carbon (TOC), particulate organic carbon (POC), dissolved organic carbon (DOC), easily oxidizable carbon (EOC), and total organic carbon (TOC), and microbial biomass carbon (MBC). The results of the study showed that with the increase of the grazing prohibition period (<10 a), the soil TOC, DOC, EOC, and MBC contents of meadows and swampy meadows increased significantly (P<0.05); with the increase of soil depth, the contents of TOC, EOC and MBC in meadows and swampy meadows soil gradually decreased, while the contents of POC and DOC gradually increased. The physical and chemical properties of soil significantly affected the content of each component of soil active organic carbon, and TN was the dominant factor affecting the content of each component of soil active organic carbon in meadows and swamp meadows. The fenced grazing prohibition is beneficial to the restoration of soil quality and carbon sequestration capacity in the alpine wetland in northwest Yunnan, and the restoration effect is more obvious with the increase of grazing prohibition years. The restoration effect of Napa Sea swampy meadow soil was more significant than that of meadow soil in the same restoration period. This study can provide a theoretical basis for grazing wetland restoration research.