旅游干扰对太原万柏林生态园土壤团聚体稳定性及有机碳分布的影响

以太原万柏林生态园为试验对象，研究了旅游干扰对土壤团聚体组成及有机碳分布的影响。结果表明，随着旅游干扰强度增强，景区土壤< 1 mm粒级团聚体数量逐渐升高，而> 1 mm粒级团聚体数量、水稳性团聚体平均质量直径（MWD）和平均几何直径（GMD）则均逐渐降低；土壤总有机碳含量和各粒级团聚体有机碳含量均随旅游干扰强度增强而逐渐降低，且0 ~ 20 cm土层、> 1.0 mm粒级团聚体降低幅度高于20 ~ 40 cm土层、< 0.5 mm粒级团聚体；随着旅游干扰强度的增加，>2 mm粒级团聚体对土壤有机碳的贡献率逐渐降低，而< 1 mm粒级团聚体贡献率逐渐升高。综上所述，旅游干扰会显著降低景区土壤团聚体稳定性和有机碳含量，破坏土壤质量，建议相关部门合理制定旅游环境容量、提高游客环保意识，减轻负面影响。

Effects of Tourism Disturbance on Soil Aggregate Stability and Organic Carbon Content in Wanbailin Ecological Forestry Park of Taiyuan

Taking the Wanbailin Ecological Forestry Park of Taiyuan as the experimental object, the effects of tourism disturbance on the aggregates and soil organic carbon(SOC) contents in the soil layers of 0 - 20 cm and 20 - 40 cm were investigated. The results showed that the number of < 1 mm particle-size aggregates in the scenic soil were gradually increased with the increase of tourism disturbance intensity, while the number of > 1 mm particle-size aggregates, soil aggregate mean weight diameter (MWD) and mean geometric diameter (GMD) were gradually decreased. With the increase of tourism disturbance intensity, total organic carbon (TOC) in soil and all aggregates were gradually decreased. The decreasing degress of TOC in the soil layer of 0 - 20 cm soil and > 2 mm size aggregates was larger than that of 20 - 40 cm and < 0.5 mm size aggregates. The contribution rate of > 2 mm particle-size aggregates to SOC was gradually decreased, while that of < 1 mm particle-size aggregates gradually increased. In summary, tourism disturbance could significantly reduce the soil aggregates stability and SOC in the scenic spots, and damage soil quality. It was recommended that relevant departments should reasonably formulate tourism environmental capacity and improve tourists' environmental awareness, so as to reduce negative impacts.