水土保持学报2025，Vol.39Issue(5)：421-428,8.DOI:10.13870/j.cnki.stbcxb.2025.05.037
1990-2020年中国东北地区土地利用变化对SOC储量的影响
Impact of Land-Use Changes on SOC Stocks in Northeast China from 1990 to 2020
摘要
Abstract
[Objective]To investigate the effects of land use and cover change(LUCC)on carbon stocks of specific soil types in northeast China.[Methods]Based on the obtained soil organic carbon(SOC)stock data and land cover data from 1990 to 2020,ArcGis was used for spatial analysis to extract long-term cropland and land type conversion periods.LUCC dynamics and their influencing mechanism on SOC stocks were analyzed.[Results]1)From 1990 to 2020,the study area generally maintained as a carbon source,with SOC stocks decreasing by 0.046 Pg.Specifically,SOC stocks in croplands and wetlands decreased by 0.111 Pg and 0.007 Pg,respectively,while those of other land-use types declined by 0.313 Pg.In contrast,SOC stocks in grasslands and forests increased by 0.102 and 0.283 Pg,respectively.2)Long-term cultivation resulted in a loss of 0.341 Pg of SOC stocks.Reclamation of natural lands(forests and grasslands)led to SOC losses of 5.79%and 4.32%,respectively.3)Land-use changes were mainly reflected in a decrease in cropland area(11 917 km2)and an increase in forest and grassland areas(1 535-4 213 km2).Wetlands decreased by 1 185 km2,primarily occurring in Inner Mongolia and Heilongjiang(89.00%).4)The decreased cropland area was mainly converted into grasslands(64.00%)and other land types(29.00%),with meadow soil,dark brown soil,and chernozem being the main soil types.Wetland loss mainly occurred in black soil and meadow soil regions,while the conversion of other land-use types into forests and grasslands primarily involved dark brown soil(15.00%-41.00%)and meadow soil.[Conclusion]Changes in SOC stocks in northeast China are mainly driven by natural land reclamation and long-term cultivation,as well as the policies of returning croplands to forests and grasslands and the demand for ecological restoration.In the future,efforts should be strengthened to restore croplands and wetlands and to protect forests and grasslands in Heilongjiang,so as to enhance SOC stocks.关键词
土壤有机碳/土地利用变化/黑土区土壤类型/耕地转化Key words
soil organic carbon/land-use change/soil types in black soil regions/cropland conversion分类
资源环境引用本文复制引用
秦祝元,刘焕军,孟祥添,王翔,于云飞..1990-2020年中国东北地区土地利用变化对SOC储量的影响[J].水土保持学报,2025,39(5):421-428,8.基金项目
国家重点研发计划项目(2021YFD1500100) （2021YFD1500100）
