[目的] 分析不同种植年限的新疆干旱区枣园土壤有机碳组成及特征,为该区域果业可持续发展提供理论依据. [方法] 以新疆南疆麦盖提县4种不同种植年限的枣园为研究对象,分析测定不同园龄、不同层次土壤总有机碳、活性有机碳、有机碳密度及碳库活度. [结果] 随着种植年限的增加,枣园土壤有机碳含量在时间尺度上表现为先增长后下降的趋势;在空间尺度上,有机碳含量表层最大,随着土层厚度的增加呈现出逐层降低的趋势;各个土层随种植年限的增加土壤有机碳密度变化趋势总体上为先减小后增大,在空间尺度上,土壤有机碳密度随土层深度的增加逐渐增大;不同年限枣园土壤有机碳储量多数集中在土壤表层,在10 a时达到最大;在时间和空间尺度上,土壤碳库活度总体上表现为先增大后减小的趋势. [结论] 该地区土壤有机碳含量随种植年限的增加逐渐增加,在一定程度上,土壤碳库含量随种植年限的增加积累程度不同;土壤碳库活度随种植年限的增加各个层次的土壤碳库活度总体上表现为先增大后减小的趋势.
[Objective] The objective of this study is to analyze the composition and characteristics of soil organic carbon in jujube orchard with different planting years in Xinjiang arid area in order to provide a theoretical basis for the sustainable development of the regional fruit industry in this region. [Methods] Taking four different jujube orchards in the southern of Xinjiang Mengaiti County as the object, the total organic carbon, soil active organic carbon, organic carbon density and carbon activity in the orchard with different planting years were analyzed. [Results] With the increase of planting years, the content of soil organic carbon increased initially and then decreased. The content of soil organic carbon was the maximum at the surface of the soil, and it decreased with increasing soil depths. In contrast, soil organic carbon density decreased initially and then increased with the increase of planting years. Soil organic carbon stocks mostly concentrated in surface soil, and with the increasing planting period, it increased initially, reached the maximum at 10 a, and then decreased. Similarly, soil carbon pool activity also showed a decreasing trend initially and then increased with the increase of planting years. [Conclusion] The content of soil organic carbon in the study area increased with the increase of the planting years, and the accumulation of soil carbon pool was different in various planting years. The activity of soil carbon pool at different layer increased initially and then decreased.