土地利用优化对土壤固碳潜力的效应模拟（英文）

Increasing soil organic carbon(SOC) sequestration is not only an efficient method to address climate change problems but also a useful way to improve land productivity.It has been reported by many studies that land-use changes can significantly influence the sequestration of SOC.However,the SOC sequestration potential(SOCP,the difference between the saturation and the existing content of SOC) caused by land-use change,and the effects of land-use optimization on the SOCP are still not well understood.In this research,we modeled the effects of land-use optimization on SOCP in Beijing.We simulated three land-use optimization scenarios(uncontrolled scenario,scale control scenario,and spatial restriction scenario) and assessed their effects on SOCP.The total SOCP(0–20 cm) in Beijing in 2010 was estimated as 23.82 Tg C or 18.27 t C/ha.In the uncontrolled scenario,the built-up land area of Beijing would increase by 951 km~2 from 2010 to 2030,and the SOCP would decrease by 1.73 Tg C.In the scale control scenario,the built-up land area would decrease by 25 km~2 and the SOCP would increase by 0.07 Tg C from 2010 to 2030.Compared to the uncontrolled scenario,the SOCP in 2030 of Beijing would increase by 0.77 Tg C or 0.64 t C/ha in the spatial restriction scenario.This research provides evidence to guide planning authorities in conducting land-use optimization strategies and estimating their effects on the carbon sequestration function of land-use systems.