【摘要】 以长白山北坡不同海拔土壤为研究对象，探讨不同海拔团聚体有机碳储量和团聚体稳定性的变化规律，对了解高山土壤团聚体固碳机制有重要意义。结果表明：团聚体有机碳储量主要集中在>0.25 mm粒级，在海拔1 200～1 700 m和2 600 m，团聚体有机碳储量的优势粒级为>2 mm，海拔700～1 100 m和1 800 m中0.25～2 mm粒径团聚体有机碳储量最高。>2 mm和0.25～2 mm碳储量占总碳储量的17%～77%和20%～71%；而0.053～0.25 mm和<0.053 mm的碳储量分别为2%～9%和1%～15%，表明土壤固碳的贡献主要依赖于>0.25 mm的大团聚体。随着海拔高度的增加，平均重量直径（MWD）和几何平均直径（GMD）的变化趋势相同，均呈现先减小后增大的趋势，说明低海拔（700～1 000 m）和高海拔（1 400～2 600 m）土壤团聚体稳定性高于中海拔（1 100～1 300 m），均在海拔800 m达到最高点，其次是2 600 m，在海拔1 300 m最低。大团聚体和土壤养分含量高是土壤固碳及团聚体稳定性的重要因素。更多还原

【Abstract】 Soil at different altitudes in the Northern Slope of Changbai Mountain were selected as the research objects to explore the change rules of organic carbon storage and stability of aggregates at different altitudes, which is of great significance for understanding carbon sequestration mechanism of alpine soil aggregates. The results show that the aggregate organic carbon storage mainly concentrated in the particle size of >0.25 mm, at altitudes of 1 200-1 700 m and 2 600 m, the dominant particle size of aggregate organic carbon storage was >2 mm, and 0.25-2 mm particle size of aggregate organic carbon storage was the highest at altitudes of 700-1 100 m and 1 800 m. >2 mm and 0.25-2 mm accounted for 17%-77% and 20%-71% of the total carbon storage, respectively. However, the carbon storage range of 0.053-0.25 mm and <0.053 mm was 2%-9% and 1%-15%, respectively, indicating that the contribution of soil carbon sequestration mainly depended on large aggregates of >0.25 mm. With the increase of altitude, the mean weight diameter(MWD) and geometric mean diameter(GMD) had the same change trend, both of which decreased first and then increased,indicating that the stability of soil aggregates at low altitude(700-1 000 m) and high altitude(1 400-2 600 m) was higher than that at middle altitude(1 100-1 300 m). The soil aggregates reached the highest value at 800 m, followed by 2 600 m, and the lowest value at 1 300 m. The high content of macro-aggregates and soil nutrients are important factors for soil carbon sequestration and soil aggregate stability.更多还原