关键词: 典型黑土区, 碳储量, 土地利用, InVEST模型, 时空格局

Abstract: The typical black soil area of Heilongjiang province has the dual attribute of “commercial grain base and fragile carbon pool system”,and regional land use change affects carbon storage transformation and food security.At present,there are limited studies on the spatio-temporal evolution of carbon storage and land use response in black soil region from the perspective of long time series and multi-spatio-temporal overall.Based on the spatial analysis functions of ArcGIS software,such as spatial autocorrelation,cluster analysis and barycentric analysis,and InVEST model,this study quantitatively and visualises the impact of land use change on the spatio-temporal pattern of carbon storage in typical black soil regions from 1990 to 2020.The results showed that:①In the past 30 years,cultivated land was the dominant land type in the study area,and the overall growth trend was 64%,the area of forest land and grassland fluctuated,the water area continued to shrink year by year,and the unused land and construction land showed an increasing trend,with an increase or decrease of about 6%.②The carbon storage in the typical black soil area showed a “growing-decent-decline”fluctuation,with a total decrease of 7.28×10⁷ t in the past 30 years,in which the carbon storage of cultivated land increased by 12.65×10⁷ t,while the carbon storage of forest land,grassland and water area decreased by 21.85×10⁷ t.③From the perspective of the direction of the change of the center of gravity,the carbon storage showed a “Z-shaped”trend of “northwest-northeast-west”,showing a certain spatial convergence phenomenon,which first increased and then weakened.The high-high concentration was obvious in the north,and the low-low concentration was mainly in the west and south.④Land use transfer is an important factor in the change of carbon storage,and cultivated land is the main carbon reservoir in the study area,accounting for 66%of the total carbon.The conversion of grassland to cultivated land and unused land to cultivated land is the key reason for the increase of carbon storage,and construction land contributes the least.Changes in water-unused land lead to greater loss of carbon stocks.The research can provide scientific basis for food and ecological security decision-making in typical black soil areas.

Key words: typical black soil area, carbon storage, land use, InVEST model, spatio-temporal pattern