Study On The Impact Of County Agricultural Structure On Farmland Ecological Service Value In Sichuan Province Based On GWR Model

The ecological environment has always been the top priority for the survival and development of mankind.The 19 th National Congress of the Communist Party of China has regarded the construction of ecological civilization as a millennium plan for the sustainable development of the Chinese nation.Farmland ecosystem is an important part of the whole ecosystem,which is related to food security,farmers’ livelihood and other big issues.The ecological benefits can be measured by the value of farmland ecological services.As the foundation of the national economy,agriculture needs to constantly adjust its industrial structure to adapt to new forms of development.Therefore,the analysis of the impact of agricultural industrial structure on the value of farmland ecological services has profound practical significance for the optimization and adjustment of agricultural industrial structure.In this paper,the research area is located in Sichuan province,which is rich in ecological resources.The research unit is accurate to the county area,which is more representative,accurate and regional.First of all,based on the three land use status chart of 2005,2010 and 2015,equivalent factor method is used to calculate the three periods of the county of Sichuan province farmland ecosystem service value are 1375.17×108,1364.70×108,and 1357.20×108 RMB.The counties of farmland ecosystem service value after the classification and analyses its space-time change found that although the whole farmland ecosystem service value is higher,but the downward trend year by year,the county ecological service value difference between great,time and space differentiation is obvious.Secondly,the global Moran’s I index and local Moran’s I index are used to prove that there is a significant spatial clustering phenomenon of county ecological service value in Sichuan province.Finally,the selection of the cultivated land use structure,agricultural material input and three aspects of industry evolution,a total of eight agricultural industrial structure adjustment index as the independent variable,after inspection,GWR model is established to estimate the county of Sichuan province agricultural industrial structure to the influence of farmland ecosystem service value after the following conclusions:(1)In terms of the structure of cultivated land use,the ratio of paddy fields and upland to farmland ecological service value presents the phenomenon of climatic and topographic constraints;The cultivated land area has a strong positive influence on the value of farmland ecological service.The influence of irrigation rate on the value of farmland ecological services is generally negative,especially in panxi area and northeast area of Sichuan province.(2)In terms of agricultural material input: increasing the application amount of chemical fertilizer will destroy the original ecological service balance of farmland and reduce the value;Improving the level of agricultural mechanization in areas with less people and more land can effectively improve the value of farmland ecological services,but it is not significant in areas with abundant agricultural labor force.(3)In terms of industrial evolution,the impact of the ratio of breeding stock on the value of farmland ecological services generally conforms to the geographical characteristics of the livestock and planting areas;Under the influence of surplus rural labor force,the increase of agricultural employment may reduce the value of farmland ecological services in early research period.However,as rural labor shortage becomes more and more serious due to out-migration,the increase of agricultural employment can significantly improve the value of farmland ecological services.The influence of value added by private agricultural enterprises on the value of farmland ecological services may be related to consumption level and environmental vulnerability.