Spatial Optimization of Seasonal Fallow Ecological Compensation Standards at the Basin Scale:A Case Study of the Haihe River Basin
Seasonal fallow is an important mean for the comprehensive management of groundwater.It is of great significance to explore the regionally differentiated fallow ecological compensation standards for formulating and improving the ecological compensation mechanism,thus ensuring the long-term sustainability of the policy.This paper takes the Haihe River Basin as an example,which is both the main grain production area and the most severe groundwater overdraft region in China Based on the theoretical framework of ecological compensation,we construct an ecological-economic model at the spatial scale of 15 sub-basins in the Haihe River Basin.We then use the model to optimize the fallow ecological compensation standards in each sub-basin under different policy scenarios and to simulate the changes in cropping structure and the effects on groundwater extraction.The results are as follows.(1)The value range of regionally differentiated fallow ecological compensation standards in the Haihe River Basin is 218-689 yuan/mu.(2)The implementation of fallow ecological compensation standards based on spatial optimization of each sub-basin can incentivize farmers to reduce the planting areas of winter wheat,adjust cropping structure,and achieve greater groundwater conservation goals without compromising the cultivation income.(3)The implementation of regionally differentiated fallow ecological compensation standards can reduce public financial expenditure by 10％while maintaining the effects of the current policy,in the case of expanding the policy coverage,it can increase the average additional groundwater conservation by 67m3/mu in the basin.Therefore,under the condition of limited financial budget,the regionally differentiated fallow ecological compensation standards can ensure the effectiveness and sustainability of policy implementation.
Seasonal FallowGroundwater OverdraftEcological Compensation StandardsSpatial OptimizationHaihe River Basin
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