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秸秆还田等农田管理措施能有效地增加土壤碳储量,从而有利于减缓大气CO2浓度的上升趋势。论文基于环境政策综合气候模型(EPIC),采用千烟洲生态试验站和鹰潭生态试验站农田监测场长期观测数据,验证和优化了EPIC模型参数,同时利用1990—2010年江西省气象资料以及土壤清查资料,模拟分析了4种秸秆还田(CR)比例情景下2010—2030年江西省水稻田土壤的固碳潜力。研究结果表明,无秸秆还田(CR0%)和秸秆还田25%(CR25%)两种处理下耕作层土壤有机碳储量分别下降21.3%和6.5%,秸秆还田50%(CR50%)和100%(CR100%)处理下土壤有机碳储量分别增加5.4%和11.9%;相对CR0%情景而言,CR25%、CR50%、CR100%情景下江西省水稻田土壤总固碳潜力分别为6.43、14.92和25.26 TgC(1 Tg=106t)。研究结果表明,通过合理的调控措施,采用保护性耕作(秸秆还田)是提高水稻田土壤固碳能力的一种有效途径。
Farmland management measures such as straw returning can effectively increase soil carbon storage, which is beneficial to mitigate the rising trend of atmospheric CO2 concentration. Based on the Environmental Policy Integrated Climate Model (EPIC), the EPIC model parameters were validated and optimized using the long-term observational data of Qianyanzhou Ecological Experimental Station and the Yingtan Ecological Experimental Station. At the same time, by using the meteorological data of Jiangxi Province from 1990 to 2010, The carbon sequestration potentials of paddy soils in Jiangxi Province from 2010 to 2030 under simulated conditions of straw returning (CR) were simulated and analyzed. The results showed that soil organic carbon storage decreased by 21.3% and 6.5%, 50% (50%) and 50% (50%) of straw returning to the soil under no straw returning (CR0%) and straw returning to the field Soil organic carbon storage increased by 5.4% and 11.9%, respectively under 100% (CR100%) treatment. Compared with the CR0% scenario, the total soil carbon sequestration potential of paddy soils under CR25%, CR50% and CR100% was 6.43, 14.92 and 25.26 TgC (1 Tg = 106 t). The results show that conservation tillage (straw returning) is an effective way to improve soil carbon sequestration in paddy soils through reasonable regulation and control measures.