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以东北典型黑土区林龄分别为8a,21a,30a,37a,52a的落叶松人工林为研究对象,通过对土壤干团聚体组成、不同粒级团聚体有机碳含量及有机碳贮量的测定、计算与分析,研究了不同林龄落叶松人工林土壤团聚体有机碳分配特征及其动态变化规律。结果表明:在0-30cm土层范围内,各粒级团聚体组成比例随粒级从大到小呈“∧”型分布,2～5mm粒级团聚体所占比例均最大,且与其他粒级存在显著性差异(P<0.05)。表层土壤各粒级团聚体有机碳含量均大于下层土壤,表层土壤中各粒级团聚体有机碳平均变化范围为32.17～48.75g/kg,下层土壤中的变化范围28.82～33.53g/kg,并均以2～5mm粒级团聚体有机碳含量最低。团聚体有机碳贮量随林龄的变化表现为大粒级团聚体(5～10mm)有机碳贮量的降低和小粒级有机碳贮量的增加。表层土壤有机碳贮量大于下层土壤有机碳贮量,但均以2～5mm粒级团聚体有机碳贮量最高,故可以认为土壤有机碳贮量的变化主要取决于各个粒级团聚体组成比例而不是各个粒级团聚体有碳含量。研究结果为进一步评价人工林植被恢复对土壤有机碳的影响提供了理论依据和参考。
Taking Larix gmelinii plantations with typical ages of 8a, 21a, 30a, 37a and 52a in the typical black soil area of northeastern China as study objects, the organic carbon content and organic carbon storage of soil aggregate aggregates with different size fractions were determined. , And calculated and analyzed the distribution characteristics of organic carbon in soil aggregates and their dynamic changes under different ages of Larix gmelini plantation. The results showed that in the range of 0-30 cm soil layer, the proportion of aggregates in each particle size ranged from “Λ” to " There were significant differences in other fractions (P <0.05). The organic carbon content of surface soil aggregates was larger than that of the lower soil. The average SOC range of the aggregates was 32.17-48.75 g / kg for the top soil and 28.82-33.53 g / kg for the lower soil and The content of organic carbon in 2 ~ 5mm granule aggregates was the lowest. Organic carbon storage of aggregates showed a decrease in organic carbon storage and an increase in small-sized organic carbon storage with the age of large aggregates (5-10 mm). The soil organic carbon storage in the surface soil is larger than that of the lower soil organic carbon storage, but the highest organic carbon storage is in the 2-5 mm soil aggregates. Therefore, it can be considered that the change of soil organic carbon storage mainly depends on the composition ratio Rather than individual particle aggregates have carbon content. The results provide a theoretical basis and reference for further evaluating the impact of plantation restoration on soil organic carbon.