Research On The Trade-offs And Synergies Of Ecosystem Services In The Jinghe River Basin

In the context of ecological protection and high-quality development in the Yellow River Basin,it is of great significance to study the complex relationship among ecosystem services in the basin for regional ecological reconstruction.The trade-offs and synergies of major ecosystem services in the Loess Plateau need to be further analyzed at basin scale.The paper took the Jinghe River Basin as the research object,based on the SWAT model and the In VEST model,and used the production possibility frontier(Pareto curve)to quantitatively analyze the soil conservation services,water production services and habitat quality in the Jinghe River Basin ecosystem from 2000 to 2020.The trade-offs and synergies among them are discussed,and the changing mechanisms of that under different terrain conditions are discussed.The main conclusions showed that:(1)The spatiotemporal changes of major ecosystem services in the Jinghe River Basin from 2000 to 2020 were significant.The mean annual value of water production service is 243.76mm,which is mostly concentrated in May-October,and spatially concentrated in the central and southern areas of the basin,and the service function improves with the increase of elevation and the decrease of slope.At the same time,the mean annual soil conservation amount is 4.21 × 108t,and the soil conservation capacity is obviously affected by terrain,and increased with the increase of slopeand reduced first and increased later with the increase of elevation,which is relatively large in Liupan Mountains area.Significantly affected by terrain,the habitat quality increases with the increase of the slope and decreases constantly with the increase of the elevation.Habitat degradation is closely related to urbanization,and the habitat quality of Ziwuling forest region and Liupan Mountains is relatively high.(2)There is a synergistic relationship between water production service and soil conservation and between habitat quality and soil conservation.With the accumulation of one service,another service shows an accelerated growth trend.But there is a trade-off relationship between water production service and habitat quality.The higher the habitat quality,the less conducive the water production.In addition,the trade-off relationship between water production services and habitat quality is gradually weakening.At the same time,the trade-off and synergistic relationship between ecosystem services is different at different stages and has scale effects.That is,the correlation among various services at the sub-basin scale is different from that of the whole basin scale.(3)There are certain regularities in the changes of the trade-off and synergy relationship under different terrain conditions.The changes in elevation have an impact on the cumulative benefits of trade-offs and synergy,which is more pronounced in the elevation range of 12451627m.However,under the disturbance of human activities,the influence of slope on the tradeoff and synergy between different ecosystem services varies greatly.