| Water is the source of all things,the basic element to maintain the balance of the ecosystem,and the lifeline for the construction and development of ecological civilization.It is necessary to insist on using water to determine the city,water to determine the land,water to determine people,water to determine production,and water resources as the lifeline.Maximum rigidity constraint.Under the background of the era when the country is fully promoting the construction of ecological civilization,the comprehensive renovation of land and space and ecological restoration is an important starting point for the realization of General Secretary Xi’s concept of"green water and green mountains are golden mountains and silver mountains".How to establish a land consolidation performance evaluation model with the construction of ecological civilization as the core has become a key issue that needs to be solved urgently.This paper uses the water footprint theory as a tool to link the land remediation project and the construction of ecological civilization and introduces the blue,green,and gray water footprint into the evaluation index system to construct an evaluation model for the ecological performance of land remediation.Jingxian County of Hengshui City is selected as the empirical research area,and its ecological performance is evaluated and divided into four grades:excellent,good,medium,and poor.On this basis,it explores the obstacles and types that hinder the improvement of its ecological performance and proposes future land improvement and development suggestions based on the actual situation of Jingxian County.The main conclusions are as follows:(1)Based on the concept and theory of water footprint,the CROPWAT model is used to calculate the growth water footprint of main crops in Jingxian County and the regional blue-green-grey water footprint.It is concluded that the blue,green,and gray water footprints of winter wheat in 2016 are 738.01 m~3/t,80.33 m~3/t,and 953.38 m~3/t,respectively;summer corn in the same year were 196.90 m~3/t,463.08 m~3/t,and 878.40 m~3/t.The blue,green,and gray water footprints of winter wheat in 2019 were 792.71 m~3/t,90.28 m~3/t,and 934.33m~3/t,respectively;summer corn in the same year were 479.18 m~3/t,355.14 m~3/t,and 963.32m~3/t.According to production calculations,the blue,green,and gray water footprints of Jingxian County in 2016 were 553173158.26 m~3,321528089.26 m~3,and 11083838581.08m~3;the blue,green,and gray water footprints of Jingxian County in 2019 were 967114630.64m~3,338686677.92 m~3,and 1442927516.40 m~3.(2)Taking 16 villages and towns in Jingxian County as the evaluation unit,the blue-green water-grey water footprint is introduced into the evaluation index system,and a land remediation ecological performance evaluation model with four specific remediation projects as the criterion level and a total of 11 indicators is constructed.The comprehensive weighting method is selected to calculate the index weight,and the natural breakpoint method is used to classify the ecological performance.(3)Selecting Jingxian County for empirical research,combining the research results with the obstacle degree model,and specifically analyzing the obstacle factors and types that hinder the improvement of ecological performance,it is concluded that there are 13townships in Jingxian County at the intermediate level and above,and the overall level is at a good level.Among them,there are five townships at the excellent and intermediate levels,and three townships at the good and poor levels.Looking at Jingxian County as a whole,the increase rate of newly added irrigated land,the increase rate of road hardening,the increase rate of irrigation and drainage density,the increase rate of dryland hydration and the increase rate of biological abundance index are the main obstacles.In terms of obstacle types,Jingxian County is mainly based on water conservancy obstacles and leveling obstacles,and road obstacles and ecological obstacles are supplemented.For the towns and towns under the jurisdiction of Jingxian County,there are 5 leveling barriers,namely Zhuhe Town,Jingzhou Town,Anling Town,Beiliuzhi Town and Liuzhimiao Town;there are 3 road barriers,namely Later,they were named Fu Township,Wencheng Township and Lianzhen Township;the number of water conservancy barrier towns was up to 7,namely Longhua Town,Wangqiansi Town,Duqiao Town,Qinglan Township,Wangtong Town,Liangji Township and Liu Jixiang;only Guangchuan Town is an ecological barrier type.(4)Put forward development suggestions for Jingxian County:strengthen policy guidance to improve ecological awareness;adjust measures to local conditions to promote scientific land reclamation projects;attach great importance to agricultural technology to achieve mechanized development;establish a sound regulatory mechanism to achieve long-term benefits;broaden funding channels for investment improve the utilization. |
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