Study On The Spatial Coupling Of The Dominant Influencing Factors Of Cultivated Land Quality In Hilly Regions Of South China

The development,utilization and protection of cultivated land resources affect national agricultural development and national economic development.Previous studies have basically revealed the current situation and development trend of cultivated land quality,but less involved in the spatial coupling between factors affecting the quality of cultivated land.Through the spatial coupling analysis of the leading influencing factors of the cultivated land quality in fengxin county,this study can provide countermeasures for the improvement of the cultivated land quality in the southern hilly areas,provide some guidance for the brief and evaluation of the cultivated land quality evaluation index system,and provide scientific basis for the rational utilization and protection of cultivated land.Based on the references and according to the actual situation of the study area and relevant experts’ suggestions,this paper screens out the influencing factors of cultivated land quality in southern hilly areas,and then carries out relevant analysis to get the dominant influencing factors of cultivated land quality.On this basis,it calculates the coupling degree of the dominant influencing factors of cultivated land quality and carries out spatial autocorrelation analysis to explore the space between the influencing factors.Inter-coupling provides a reference for the construction of evaluation index system of cultivated land quality in hilly areas of southern China.The main results of this study are as follows:(1)In this paper,20 influencing factors of cultivated land quality in the southern hilly areas were screened from five aspects: topographical characteristics,soil characteristics,farming conditions,health status and biological characteristics.Correlation analysis of 20 impact factors by SPSS software,selected field slope,effective soil thickness,organic matter content,plough layer texture,soil configuration,field condition,field road accessibility,irrigation guarantee rate,drainage conditions,soil The 11 impact factors of heavy metals and soil mites are the dominant factors in the quality of cultivated land in the study area.(2)According to the distribution of influencing factors,six main influencing factors,namely,plough layer texture,effective soil layer condition,organic matter content,field condition,irrigation guarantee rate and drainage condition,were selected to conduct coupling analysis.The results of calculation of coupling degree between field condition,irrigation guaranteed rate,drainage condition and organic matter content,plough layer texture and effective soil layer thickness are between 0.83 and 0.91,which are better on the whole.It shows that there is strong coupling between field condition,irrigation guaranteed rate,drainage condition and organic matter content,plough layer texture and effective soil layer thickness,that is,field condition and irrigation guaranteed degree.The better the rateand drainage conditions are,the higher the scores of organic matter content,plough layer texture and effective soil layer thickness are.(3)By calculating the coupling degree between the dominant factors of cultivated land quality in Fengxin County,the coupling degree between the dominant factors of cultivated land quality in Fengxin County is positive,ranging from 0.1111 to 0.5612,assuming that the test value P is close to 0,less than 0.05;Z-score is all positive,and more than 1.96,indicating that the study area is under 95% confidence.There is a positive spatial correlation between the coupling degree of the main factors affecting the quality of cultivated land.Through the local autocorrelation analysis of the coupling degree among the dominant factors of cultivated land quality,combined with the distribution of the influencing factors,the HH type area of the coupling degree among the influencing factors is distributed in the area with better influencing factors,that is,the high scores of the influencing factors coincide in the spatial position.Using land consolidation and other means to improve the shape of cultivated land,irrigation and drainage and other cultivation conditions,also contribute to the improvement of the natural quality of cultivated land,and thus achieve the purpose of improving the quality of cultivated land.