草地生态管理下内蒙古草地土壤有机碳库动态研究  

Dynamic Study on Soil Organic Carbon Reservoir in Inner Mongolia Grassland Under Grassland Ecological Management

作　　者：罗文蓉 胡国铮 高清竹[1] LUO Wen-rong;HU Guo-zheng;GAO Qing-zhu(Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences/Key Laboratory for Agro-Environment&Climate Change,Ministry of Agriculture,Beijing 100081,China)

机构地区：[1]中国农业科学院农业环境与可持续发展研究所/农业部农业环境与气候变化重点实验室,北京100081

出　　处：《生态与农村环境学报》2020年第12期1588-1597,共10页Journal of Ecology and Rural Environment

基　　金：国家重点研发计划(2016YFC0500508);国家自然科学基金(31800383)。

摘　　要：为探究草地生态管理措施下土壤有机碳库的动态变化,科学评估草地生态建设成效及草地碳循环,以内蒙古草原为研究区,基于IPCC Tier 2碳收支清单方法,分析2001—2015年内蒙古各管理草地面积变化动态,并估算不同管理措施(禁牧、休牧、轮牧、围栏、改良和人工种草)下内蒙古不同类型草地(温带草甸草原、温带典型草原和温带荒漠草原)表层土壤有机碳储量。结果表明:(1)2001—2015年内蒙古各管理草地面积变化不一致,活动面积整体随时间呈显著增加趋势(P<0.01);(2)不同草地管理措施下土壤固碳速率变化不同。禁牧和休牧措施下的土壤固碳速率呈显著上升趋势(P<0.05),草地管理措施促进土壤固碳;(3)2001—2015年内蒙古草地总体表现为碳汇,采用整合分析(Meta-analysis)得到不同草地管理措施下土壤有机碳的确定区间,土壤有机碳变化速率平均为(473.70±53.93)万t·a-1(以C计);不同类型草地土壤固碳速率均增加,其中典型草原的年变化量最大,平均为(174.22±74.70)万t·a-1(以C计)。内蒙古草地生态系统具有较大的碳汇潜力,在未来全球碳平衡中将发挥更大的作用;草地生态管理提升了土壤有机碳汇速率,不仅有利于北方草地的生态保护,也为我国生态、经济和社会效益提供了保障。In order to explore the dynamic changes of soil organic carbon pool under the grassland ecological management and evaluate the effect of grassland ecological construction and grassland carbon cycle scientifically,Inner Mongolia grassland was taken as the research area,based on IPCC Tier 2.Carbon budget list method.The dynamic change of grassland area in Inner Mongolia from 2001 to 2015 was analyzed,and the surface soil organic carbon reserves of different types of grassland(temperate meadow grassland,temperate typical grassland and temperate desert grassland)in Inner Mongolia under the implementation of different management measures(grazing prohibition,rest grazing,rotation grazing,fencing,improvement,grass planting)was estimated.The results show that:(1)From 2001 to 2015,the dynamic changes of grassland area in Inner Mongolia were not consistent.The overall active area increased significantly with time(P<0.01).(2)Soil carbon sequestration rate changed under different grassland management measures.Soil carbon sequestration rate showed a significant increase under grazing prohibition and grazing cessation(P<0.05)and grassland management measures promoted soil carbon sequestration.(3)From 2001 to 2015,Inner Mongolia grassland showed a carbon sink on the whole.Meta-analysis was used to determine the range of soil organic carbon under different grassland management measures.The average change rate of soil organic carbon was(473.70±53.93)×104 t·a-1.Soil carbon sequestration rates of different grassland types increased and the annual variation of typical grassland was the largest,with an average of(174.22±74.70)×104 t·a-1.Inner Mongolia grassland ecosystem has great carbon sink potential and will play a greater role in global carbon balance in the future.Grassland ecological management has effectively improved soil organic carbon sink rate,which is not only conducive to the ecological protection of northern grasslands,but also provides a guarantee for China′s ecological,economic and social benefits.

关 键 词：管理措施 内蒙古草地 有机碳储量 整合分析(Meta-analysis) 

分 类 号：X37[环境科学与工程—环境工程]