亚热带果园土壤固碳潜力估算--以永春县为例

摘要

In order to understand the soil carbon sequestration potential in subtropical orchards, the changes in soil carbon storage in Yongchun Xian, Fujian, China were studied, and soil carbon sequestration potential was estimated under existing management condition. The results showed that soil organic carbon content in orchard of Yongchun generally rose from 1982 to 2010. The annual variation in soil organic carbon was in the order of south subtropical zone>transition zone>middle subtropical zone. Based on the correlation analysis between average relative annual increment and the initial value of soil organic carbon, the orchard soil organic carbon storage capacities of Yongchun Xian was estimated from 13.74 g kg–1 to 21.05 g kg–1. Under the conditions of land management and climate in 2010, the soil carbon sequestration potential in Yongchun orchards would be 64108.77 t. These could contribute to evaluation the potential of soil carbon sequestration in orchards of China.%为了解亚热带果园土壤的固碳潜力，比较分析了永春县果园土壤有机碳含量在1982年到2010年的变化，并估算了现有经营条件下亚热带果园土壤的固碳潜力。结果表明，近28年来，永春县果园表层土壤有机碳含量总体呈上升的趋势；不同气候区域的土壤有机碳年均变幅为南亚热带气候区>过渡带>中亚热带气候区。有机碳年均变幅与初始有机碳含量的相关分析表明，永春县果园土壤有机碳潜在储存能力估计值为13.74~21.05 g kg–1。按照2010年的土地利用方式、耕作措施、施肥水平和气候条件，永春县果园土壤的固碳潜力为64108.77 t。这些有助于认识和评价我国果园土壤碳汇能力和固碳潜力。