【摘要】 矿区植被对土壤有机碳的分布具有重要影响，摸清不同植被类型下SOC的分布状况，对了解矿区土壤固碳功能具有重要意义。本研究以陕北红柳林煤矿区未采区和开采区的典型植被类型下的土壤为研究对象，分析了0～200 cm不同土层SOC、可溶性有机碳(DOC)、微生物量碳(MBC)及土壤理化性质指标，阐明了不同植被类型下SOC垂直分布特征及其影响因素。结果表明：1)不同植被类型下，未采区与开采区SOC、DOC、MBC随土层深度的增加整体呈下降趋势，其中，未采区灌木林地SOC含量高于草灌混合区，草地最低，开采区草地SOC含量高于灌木林地，草灌混合区最低；2)在0～100 cm和0～200 cm土层，开采区草地与灌木林地的有机碳密度(SOCD)均显著高于未采区各处理，其中未采区草地0～200 cm土层SOCD最低，草灌混合区最高，开采区草地0～200 cm土层SOCD高于灌木林地，且二者显著高于草灌混合区；3)SOC与土壤含水量、无机碳、电导率之间整体呈正相关关系，与pH呈负相关关系。陕北煤矿区SOC的垂直分布主要受植被类型和土壤理化性质的影响，未采区植被恢复建议以草灌混合植被(沙柳、柠条和长芒草)为主，开采区以草本(羊草和冰草)为主。更多还原

【Abstract】 Vegetation in coal mining area has a crucial impact on the distribution of soil organic carbon(SOC). Understanding the distribution of SOC under different vegetation types is of great guiding value for soil carbon sequestration in coal mining area. By analyzing soils under different vegetation types in unexploited and exploited areas of Hongliulin Coal Mining Area in northern Shaanxi province, the SOC, dissolved organic carbon(DOC), microbial biomass carbon(MBC) and physicochemical properties in different soil layers from 0cm to 200cm were determined, revealing the vertical distribution of SOC and its influencing factors. The results showed that:(1) under different vegetation types, SOC, DOC, and MBC in both non-mining and mining areas generally decreased with the soil depth increased. The SOC content in shrub land in non-mining area was higher than that of the grass-shrub mixed region, while the grassland had the lowest. The SOC content of grassland in the mining area was higher than that of shrub land, and the grass-shrub mixed region had the lowest.(2) The soil organic carbon density(SOCD) of 0～100 cm and 0～200 cm soil layers of grassland and shrub land in mining area were significantly higher than those in non-mining area. The SOCD of 0～200 cm soil layer in the grassland of non-mining area had the lowest content, while highest in the grass-shrub mixed region. However, in the mining region, the SOCD of 0～200 cm soil layer under grassland was higher than that shrub land, and they both were significantly higher than that in grass-shrub mixed region.(3) Generally, the SOC was positively correlated with soil moisture content, inorganic carbon and electrical conductivity, and negatively correlated with pH. In summary, the vertical distribution of SOC in the coal mining area of northern Shaanxi is mainly affected by vegetation types and soil physicochemical properties. It is recommended that the vegetation restoration in non-mining area should focus on grass-shrub mixed vegetation(such as Salix cheilophila, Caragana Korshinskii, and Stipabungeana), while in the mining area, herbaceous plants(such as Leymuschinensis, Agropyroncristatum) should be prioritized.更多还原