中国草地生态管理的土壤碳汇模拟研究——基于IPCC清单方法

Study on the simulation of soil carbon sink in grassland ecological management in China--based on IPCC inventory method

草地是中国重要的生态系统碳库,中国为治理草地退化和荒漠化实施了多项草地生态保护建设项目。为了探讨生态系统管理对碳汇的影响,文中基于中国草地生态管理活动水平,设定4个草地生态管理的未来情景,采用IPCC国家温室气体清单指南方法,估算和模拟了中国2001—2030年草地土壤碳汇。结果表明:2001—2010年中国草地土壤碳汇平均为-0.54亿t CO_(2)eq/a,2011—2017年显著提升为平均-1.00亿tCO_(2)eq/a;未来不同草地生态管理情景下中国草地土壤碳汇在-0.42亿t CO_(2)eq/a~-2.00亿t CO_(2)eq/a,2018—2030年草地土壤累积碳汇量为-5.46亿~-26.01亿t CO_(2)eq。本研究为中国未来草地生态管理政策的制定提供参考。

Grassland is an important ecosystem carbon pool in China.Several grassland ecological protection projects have been implemented to control grassland degradation and desertification in China.To reveal the impact of ecological management on ecosystem carbon sequestration,four future scenarios of grassland ecological management were set based on the current intensity of grassland ecological managements.Grassland soil carbon sequestration was estimated in China from 2001 to 2030 by using the IPCC Method for National Greenhouse Gas Inventories.The results showed that the mean grassland carbon sequestration was -0.54×10^(8) t CO_(2) eq/a from 2001 to 2010 in China.The grassland soil carbon sequestration significantly increased to -1.00×10^(8) t CO_(2) eq/a on average during 2011-2017.Under different grassland ecological management scenarios,the grassland soil carbon sequestration is -0.42×10^(8) to-2.00×108 t CO_(2) eq/a in China.And grassland soil will sequestrate -5.46×10^(8) to -26.01×10^(8) t CO_(2) eq accumulatively from 2018 to 2030.This study provides reference for the formulation of future grassland ecological management policies.