| Ecological environment is closely related to people’s life.With the increase of farmland use intensity and the aggravation of agricultural ecological environment,General Secretary Xi Jinping suggests building the ecological system of mountain,water,forest,farmland and lake as well as promoting ecological protection and restoration.The implementation of River Chief System deepens people’s attention to the lakeside ecological environment,especially the water environment.After preliminary study,the basin of Qiuxi River,which is a typical river in Hilly Area of Central Sichuan Basin,is studied.The main ecological problems existing in the basin of Qiuxi River is analyzed.Based on this,the influence of farmland use intensity on ecological environment is analyzed.It’s of great theoretical and practical significance on the implementation of River Chief System and the protection of ecological system.In this paper,the theories of lakeside economy,ecological economy,human-land relationship and sustainable development are adopted into use.After field investigation and questionnaire survey,the influence of farmland use intensity on lakeside ecological environment,especially the influence on earth,hydrology,atmosphere and landscape,is analyzed by means of structural equation model.The first part is an introduction;in the second part,the related concepts and theories are defined and studied;in the third part,the current situation of the study area is analyzed;in the fourth part,the problems existing in the ecological environment of the study area and their influencing factors are analyzed;in the fifth part,the empirical case of the influence of farmland use intensity on the ecological environment in Qiuxi River is studied;in the sixth part,conclusions and suggestions are proposed.The main conclusions include:1.The main problems existing in the ecological environment of Qiuxi River:(1)serious non-point source pollution within the river basin;(2)the agricultural wastewater treatment facilities are not perfect;(3)serious livestock pollution;(4)the agricultural related department environmental supervision is not in place,and so on.Meanwhile,the factors influencing ecological environment include multiple cropping index,the usage amount of pesticides and fertilizers,the input and output of farmland,and so on.2.The farmland use intensity is negatively correlated with ecological environment,which means that the greater the farmland use intensity is,the worse the ecological environment is.The farmland use intensity has the greatest impact on the hydrological quality,with-0.323 of influence path coefficient;followed by earth,landscape and atmosphere,with-0.293,-0.247 and-0.195 of influence path coefficient,respectively.In addition,the phosphorus content in earth has the greatest influence on the earth quality,with 0.85 of influence path coefficient;biological oxygen demand has the greatest influence on the hydrology quality,with 0.86 of influence path coefficient;sulfur dioxide concentration has the greatest influence on the air quality,with 0.86 of influence path coefficient;and farmland protection ratio has the greatest influence on landscape,with 0.88 of influence path coefficient.3.Suggestions and countermeasures:(1)reducing the lakeside farmland use intensity;(2)optimizing the layout of water protection zone;(3)building the coordination and interaction mechanism of pollution prevention;and(4)improving the River Chief System and related reward and punishment system. |
