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Ecosystem service dynamics in sandy land in Northeast China during the past 30 years |
ZHANG Li1, LIU Jiayu2 |
1. School of Tourism and Geographical Science, Jilin Normal University, 136000, Siping, Jilin, China; 2. Primary School Affiliated to Jilin Normal University, 136000, Siping, Jilin, China |
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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 1.98×107 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 2.88×107 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 1.60×106 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.
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Received: 22 September 2021
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