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以喀斯特峰丛洼地的伊桐、侧柏和菜豆树3个原生林植物群落为对象,分析了土壤团聚体的组成、有机碳及其剖面分布.结果表明:3个植物群落的土壤分布均以>2mm大粒径团聚体为主,约占土壤团聚体总量的76%.土壤总有机碳含量介于12.73～68.66g.kg-1之间,群落类型显著影响土壤有机碳含量及其分布.<1mm小粒径团聚体中的有机碳含量比>2mm团聚体稍高,但大部分土壤有机碳储存在大粒径团聚体中,>2mm团聚体对土壤有机碳的贡献率约70%.2～5和5～8mm团聚体含量与土壤有机碳含量呈显著正相关.提高土壤中2～8mm团聚体的含量能有效增强喀斯特地区土壤固碳能力.伊桐群落2～8mm土壤团聚体的含量及其全土有机碳含量分别达46%和37.62g.kg-1,伊桐更适合作为喀斯特地区生态恢复树种.
The composition of soil aggregates, organic carbon and its distribution in three primary forest communities of Itaedesia, Oriental Arborvitae and Beanbean in karst peak-depression area were analyzed. The results showed that the soil distribution of the three plant communities was > 2mm aggregates, accounting for about 76% of the total soil aggregates.The total organic carbon content of soil ranged from 12.73 to 68.66g.kg-1, and the community types significantly affected the content and distribution of soil organic carbon . <1mm aggregates of small size aggregates had a slightly higher content of organic carbon than> 2mm aggregates, but most of the soil organic carbon was stored in large aggregates, and the contribution of> 2mm aggregates to soil organic carbon was about 70% The content of aggregates in 2 ~ 5 and 5 ~ 8mm was positively correlated with the content of soil organic carbon, while increasing the content of 2 ~ 8mm aggregates in soil could effectively enhance the soil carbon sequestration in the Karst area. And its total organic carbon content reached 46% and 37.62g.kg-1, respectively. YT is more suitable for ecological restoration in karst areas.