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[Objective] This study was aimed to reveal the spatio-temporal characteristics of supply-demand balance of ecosystem services, and further to explore the dual effects and influencing mechanisms of land use change on the supply-demand balance of ecosystem services. [Methods] Taking the middle reaches of the Yangtze River as the research area and seleting 2000— 2018 as the research period, the quantitative matrix of supply-demand of ecosystem services was employed to analyze the spatio-temporal characteristics of the supply-demand balance of ecosystem service, and the ecological contribution rate of land use change was introduced to analyze the influencing mechanisms of land use change on the supply-demand balance of ecosystem services. [Results] (1) During the study period, the supply-demand balance of ecosystem services in the middle reaches of the Yangtze River had been continuously deteriorating, which was mainly caused by the large-scale expansion of construction land and the large-scale reduction of cultivated land and forest land, resulting in the decrease of supply capacity and the increase of consumption demand of ecosystem services. (2) The relationship between different supply of ecosystem services had changed from trade-off to synergy in time scale, and the synergy between different demand and supply-demand balance of ecosystem services had been further enhanced on the time scale, but the trade-off or synergy between supply, demand, and supply-demand balance was highly heterogeneous on the spatial scale. (3) Land use change in the MRYR had dual effects on the supply-demand balance of ecosystem services, and the deterioration effect was significantly larger than the improvement effect, but the types of land use change that cause the improvement and deterioration of supply-demand of ecosystem services and their sub-services had temporal heterogeneity. [Conclusion] Promote types of land use change that could improve the supply-demand balance of ecosystem services; promote types of land use change that are compatible with key ecosystem services; and curb types of land use change that would worsen the supply-demand balance of ecosystem services, in order to increase the sustainability of ecosystem services and improve the quality of the ecological environment.

[Objective] From the perspective of socioeconomic development transition, this study aims to explores the spatiotemporal characteristics of land use change in the middle reaches of the Yangtze River (MRYR). [Methods] The method of change range and change speed of land use change, as well as geographical information map were employed. [Results] (1) The socioeconomic development stage of the MRYR have undergone two transition processes during 2000—2018. The first is from the primary production stage II to the middle industrialization stage, with slow growth of urbanization and serious outflow of population. The second is from the middle industrialization stage to the late industrialization stage, with steady growth of urbanization and continuous return of population. (2) In terms of overall characteristics, the cultivated land area continues to decrease, the water area and construction land area continue to increase, the woodland, grassland and wetland area obviously decrease, and the unused land area remains relatively stable. (3) In terms of process characteristics, in 2000—2010, cultivated land and forest land were transformed into each other, cultivated land into construction land and water area, and water area into wetland were the main change types. In 2010—2018, cultivated land and construction land were transformed into each other, forest land into construction land and cultivated land, and wetland into water area were the main change types. (4) In terms of trajectory characteristics, the early change type is the main type, followed by the late change type and repeated change type, and the proportion of continuous change type is small. [Conclusion] The stage characteristics of land use change in the MRYR are obvious, which is manifested in the change of land use quantitative and spatial structure caused by the scale and direction of transformation between different land use types in different transition periods of socioeconomic development.