【摘要】 东北沙地位于北方农牧交错带，揭示该区长时间序列生态系统服务功能时空演化特征，可为沙地生态恢复与水土保持提供科学依据。基于InVEST模型，对1990—2020年该区土壤保持、水源涵养、碳储存量和生境质量功能进行评估。结果表明：1)东北沙地土壤保持总量呈现波动增加的变化趋势，增幅0.198亿t/a,高值区集中于科尔沁沙地的西南地区、松嫩沙地的东部和西部以及呼伦贝尔沙地的东部；2)水源涵养量总体呈现增加趋势，高值区集中于科尔沁沙地东南部、松嫩沙地东北部和呼伦贝尔沙地的东部；3)碳储存量呈增加趋势，增幅0.016亿t/a,高值区主要分布于科尔沁沙地东北部、松嫩沙地的东部、西部和呼伦贝尔沙地的东部；4)平均生境质量指数总体变化不大，呈现先上升后下降趋势，高值区域集中于松嫩沙地东部和西部、呼伦贝尔沙地的东部。东北沙地土壤保持、水源涵养、碳储存量和生境质量4大生态系统服务功能总体呈现增加趋势，增加的区域在空间上表现一定聚集性。更多还原

【Abstract】 [Background] The sandy land in Northeast China(Horqin sandy land, Songnen sandy land and Hulunbuir sandy land) belongs to the transition zone from semi-arid and semi-humid area to semi-arid area. The desertification of sandy land is serious, thus it is urgent to carry out ecosystem services. Revealing the temporal and spatial evolution characteristics of ecosystem services in this region over a long period of time may provide a scientific basis for ecological restoration and soil and water conservation in sandy land. [Methods] Based on the InVEST model and using data such as land use data, vegetation cover, digital elevation models, soil quality, etc., the article evaluated the functions of soil conservation, water conservation, carbon storage and habitat quality of this area from 1990 to 2020. [Results] 1) The total amount of soil conservation in sandy land of Northeast China increased by 1.98×10~7 t/a, and the high-value areas were concentrated in the southwest of Horqin sandy land, the east and west of Songnen sandy land, and the east of Hulunbuir sandy land. 2) The water conservation showed an overall increasing trend with an increase rate of 2.88×10~7 mm/a. The high-value areas were concentrated in the southeast of Horqin sandy land, the northeast of Songnen sandy land and the east of Hulunbuir sandy land. 3) The carbon storage increased by 1.60×10~6 t/a. The high-value areas were mainly distributed in the northeast of Horqin sandy land, the east and west of Songnen sandy land and the east of Hulunbuir sandy land. 4) The average habitat quality index changed little overall and it showed a trend of first increasing and then decreasing, the high-value areas were concentrated in the east and west of Songnen sandy land and the east of Hulunbuir sandy land. [Conculsions] The four major ecosystem service functions of soil conservation, water conservation, carbon storage and habitat quality in sandy land in Northeast China showed an overall increasing trend, and the increasing areas showed a certain spatial aggregation. From 1990 to 2020, the land use types of sandy land in Northeast China were mainly cultivated land, grassland and forest land. The area of cultivated land, construction land, sandy land and other unused land is on the increasing trend, while the area of forest land, grassland and water area is on the decreasing trend. This form of land use change has important implications for the spatiotemporal evolution of ecosystem services.更多还原