不同土地利用下黑土土壤团聚体有机碳贮量的变化

[目的]为了解土地利用方式变化对黑土土壤有机碳及贮量的影响。[方法]以黑土区草地、耕地、樟子松人工林和天然次生林土壤为研究对象，对土壤团聚体有机碳与碳储量的分布和积累进行研究。[结果]在不同土地利用方式下，土壤团聚体的组成比例存在一定差异，但均以〉2mm团聚体为主。土壤不同团聚体有机碳含量的分配并不相同。相较于林地土壤，草地和耕地均降低有机碳在小粒级团聚体中的含量，而增大大粒级团聚体有机碳的含量。在不同土地利用方式下．土壤团聚体有机碳贮量变化规律与团聚体组成比例相吻合。[结论]土壤团聚体有机碳贮量的变化中，占主导地位的是团聚体组成比例。土地利用方式的改变影响黑土有机碳在不同大小团聚体中的分布和贮量。

Influence of Land Use on Soil Organic Carbon Storage in Particle Size of Black Soil

[ Objective ] The research aimed to recognize the effects of cultivation on the soil organic carbon storage in particle size of black soil. [ Method] Taking undisturbed natural forest, farmland, woodland （grass）, mongolica plantation in black soil region as research objects, a study was undertaken to study the variations of organic carbon contents and carbon storage. [ Result] The distribution contents of soil aggre- gates had the discrepancy under the different land use, and aggregate composition was all dominated by particles 〉 2 mm. The contents of soil organic carbon of aggregates were different under different land use. Compared to forest,the contents of soil organic carbon in small micro-ag- gregates in farmland and woodland were all decreased,and the macro-aggregates increased. The changing trend of carbon storage was similar to the distribution of aggregates. [ Conclusion] The composition of soil aggregates was dominant in the change of organic storage. The transforma- tion of land use could change the accumulation of C storage in particle size of black soil.