苏北低山丘陵区典型森林土壤碳库质量分析
Analysis on the Quality of Forest Soil Carbon Pools in the Low Mountainous and Hilly Areas of Northern Jiangsu Province

研究森林土壤不同土层SOC、ASOC含量和SOCD可以为土壤碳库质量的量化分析评价提供参考。以苏北低山丘陵区不同森林类型土壤为研究对象，对其SOC、ASOC含量和SOCD的变化特征进行系统分析。结果表明：(1) 不同森林类型SOC、ASOC含量和SOCD均随土层深度呈递减趋势，并且SOC含量下降的幅度明显大于ASOC。(2) 弃荒裸地除外，针叶林SOC、ASOC含量高于其他森林类型，而针叶林SOCD低于其他森林类型。(3) 6种森林类型ASOC/TOC(%)均小于对照的弃荒裸地，而6种森林类型CPMI(%)均高于对照的弃荒裸地，针叶林CPMI(%)大于其他森林类型，针叶林的固碳潜力较强。(4) 不同森林类型能够维护森林土壤碳库质量的稳定性，加强地表凋落物的科学管理，可以提高该地区森林土壤碳库的赋存能力。
The study of SOC, ASOC content and SOCD in different soil layers of forest soils can provide a reference for quantitative analysis and evaluation of the quality of soil carbon pools. Different forest types of soils in the low mountainous and hilly areas of northern Jiangsu Province were used as research objects to systematically analyze the characteristics of changes in SOC, ASOC content and SOCD. The results showed that: (1) SOC, ASOC content and SOCD of different forest types showed a decreasing trend with soil depth, and the magnitude of SOC content decrease was significantly larger than that of ASOC. (2) Except for abandoned bare land, SOC and ASOC content of coniferous forests were higher than that of other forest types, while SOCD of coniferous forests was lower than that of other forest types. (3) ASOC/TOC(%) of all six forest types were smaller than that of the control abandoned bare land, while CPMI(%) of all six forest types were higher than that of the control abandoned bare land, and CPMI(%) of coniferous forests was larger than that of other forest types, and the carbon sequestration potential of coniferous forests was stronger. (4) Different forest types can maintain the stability of the quality of forest soil carbon pools, and strengthening the scientific management of surface apoptosis can improve the capacity of forest soil carbon pools in the region.