摘要
农田土壤有机碳储量和固碳潜力是陆地碳循环和全球气候变化研究中的一个重要问题。论文基于第二次土壤普查数据和实地取样数据,利用土壤类型法估算松嫩平原玉米带农田表层土壤有机碳储量,分析4个县市(德惠市、九台市、农安县、公主岭市)农田表层土壤碳库的饱和水平和固碳潜力,比较旱田与水田土壤固碳潜力的差异。结果表明,1980—2005年间,松嫩平原玉米带农田土壤有机碳储量增加了7.20 TgC。各县市农田土壤碳库的饱和水平以德惠市最大,为4.11 kgC.m-2,九台市次之,公主岭市最低,为3.14 kgC.m-2。假设在1980年土地利用方式、耕作措施、施肥水平和气候条件不变的情况下,估算得到松嫩平原玉米带农田土壤的固碳潜力为8.17 TgC。从单位面积固碳潜力看,九台市最高,为0.77 kgC.m-2,农安县次之,德惠市和公主岭市均低于松嫩平原玉米带。松嫩平原玉米带旱田和水田土壤碳库的饱和水平基本持平。
Organic carbon storage and sequestration potential in agricultural soils is suggested to be an important issue in the study of terrestrial carbon cycling and global climatic change. In this study, soil organic carbon storage and cropland surface soil carbon pool saturation levels in different counties as well as soil carbon sequestration potential and difference between upland and paddy field in carbon sequestration potential in Songnen Plain maize belt were investigated by using the data from the Second State Soil Survey carried out during 1979 - 1982 and from cropland investigation and quality evaluation project in Jilin Province during 2003 -2006. Results showed that soil organic carbon storage increased 7.20 TgC from 1980 to 2005. In terms of soil carbon pool saturation levels, Dehui County showed the highest value of 4. 11 kgC ·m^-2 among the four counties, and Jiutai County followed with the lowest in Gongzhuling County. Assuming the land use, tillage, fertilization and climatic conditions of the cropland remain the same as they were in 1980, the soil carbon sequestration potential of the cropland of Songnen Plain maize belt would be 8.17 TgC. In terms of per unit area soil carbon sequestration potential, Jiutai County showed the highest value of 0.77 kgC ·m^-2, followed by Nong＇ an County, and Dehui and Gongzhuling counties were lower than the study area of 0.63 kgC·m^-2 Soil carbon pool saturation levels of upland and paddy field were nearly equal.
出处
《自然资源学报》
CSSCI
CSCD
北大核心
2013年第4期596-607,共12页
Journal of Natural Resources
基金
中国科学院重点部署项目课题(KZZD-EW-08-02)
国家自然科学基金项目(40901096)
关键词
固碳潜力
有机碳储量
农田表层土壤
松嫩平原玉米带
carbon sequestration potential
soil organic carbon storage
cropland surface soil
Songnen Plain maize belt
