中国生态农业学报2017，Vol.25Issue(12)：1848-1857,10.DOI:10.13930/j.cnki.cjea.170423
未来30年川东平行岭谷区县域农田SOC动态模拟
Dynamic simulation of farmland SOC in parallel ridge valley area in eastern Sichuan in the next 30 years
摘要
Abstract
The relationship between greenhouse gas emission reduction and soil carbon sequestration has become the focus of global climate change research amidst the worsening global climate change. As a core interface of terrestrial ecosystem, farm-land soils have a huge potential to sequester carbon. Exploring the response and feedback of the dynamic balance of farmland soil organic carbon (SOC) to global climate change is significant in understanding the relationship between global carbon cy-cle and agricultural ecosystems. Dianjiang County is a typical representation of parallel ridge valley area in eastern Sichuan. It is an important grain and oil producing area in Chongqing. In the process of transformation from traditional to modern agri-culture, the area has been faced with double pressures of food security and increasing farmland SOC. Therefore in this region, it is very important to study farmland SOC and its dynamic change using specific climate model in the next 30 years. It pro-vides data support and scientific basis for sustainable utilization and management of future cultivated lands in the study area. Supported by GIS regional database established for soil properties and agricultural management system, this study simulated the dynamic change in SOC in the study area for the period 2011–2041 using the biogeochemical model DNDC. The study also used the B1climate model within BCCR_BCM 2.0 in the IPCC AR4 report. The results showed that: 1) The DNDC model fairly simulated farmland SOC and dynamic change under specific climate conditions. The correlation coefficient between the simulated and measured values was 0.981, which was significant at the 0.01 confidence level. The RMSE value of the simulated and measured values was 16%, indicating better simulated results. 2) The SOC density and storage in the 0–20 cm soil layer in the study area significantly increased for the next 30 years. The increase in carbon per unit area was 2 637.07–8 091.55 kg(C)·hm-2or 10%–34%, that in carbon sequestration was 2.7×105–8.3×105t, and that in average increase rate was 87.9–269.7 kg(C)·hm-2·a-1. 3) For the next 30 years, the farmland soil in parallel ridge valley area in eastern Sichuan was generally under continuous carbon sink. In the study area, the differences among carbon sink, carbon loss and carbon relative balance gradually increased for the next 30 years.关键词
农田土壤/土壤有机碳/DNDC模型/动态模拟/固碳量/川东平行岭谷区Key words
Farmland soil/Soil organic carbon/DNDC model/Dynamic simulation/Carbon sequestration/Parallel ridge val-ley area in eastern Sichuan分类
地理科学引用本文复制引用
张琳,邵景安..未来30年川东平行岭谷区县域农田SOC动态模拟[J].中国生态农业学报,2017,25(12):1848-1857,10.基金项目
重庆市基础科学与前沿技术研究专项(cstc2017jcyjB0317)资助 This work was supported by Chongqing Research Program of Basic Research and Frontier Technology (cstc2017jcyjB0317). （cstc2017jcyjB0317）
