Spatial-Temporal Pattern Evolution Of Cultivated Land Quality And Cultivated Land Protection Zoning In Taihu County Based On Spatial Autocorrelation

"Everything grows in the soil,and there is soil and grain." Cultivated land is the most precious agricultural resource and an important factor of production.The quality of cultivated land is related to the sustainable development of agriculture.Research and analyze the temporal and spatial pattern variation of cultivated land quality,be able to scientifically and reasonably understand the continuous changes of cultivated land quality,and propose zoning protection and improvement plans in a targeted manner,so as to guide the management of cultivated land production and improve the output and quality of agricultural products and agriculture Provide basis and reference for sustainable development.In this study,the cultivated land in Taihu County,Anqing City was used as the research area,and the cultivated land quality grade evaluation hierarchical model and membership function model of Taihu County were established to evaluate the cultivated land in Taihu County in 2008 and 2018.Based on GIS and geostatistics,based on the spatial autocorrelation method,this paper analyzed the temporal and spatial pattern evolution of cultivated land quality in Taihu County in the past ten years,and based on the analysis results of the local autocorrelation of cultivated land quality in Taihu County in 2018,proposed the regional protection and improvement of cultivated land in Taihu County.Program.The main conclusions obtained are as follows:(1)Taihu County’s cultivated land quality and high-yield field area in 2008 was2,216.46 hectares;the middle-yield field area was 14,645.88 hectares;the low-yield field area was 22,461.19 hectares.In 2018,the area of high-yield fields was 11,203.03hectares;the area of middle-yield fields was 22,537.74 hectares;and the area of low-yield fields was 11,463.56 hectares.(2)According to the time series method,the area of cultivated land in Taihu County has increased by 6,474.45 hectares over a ten-year time span,with an average change rate of P=1.65%.In terms of the quality of cultivated land,the comprehensive grade of cultivated land quality in Taihu County in 2008 was 6.75,and the comprehensive grade of cultivated land quality in Taihu County was 5.07 in 2018.The comprehensive grade of cultivated land quality has increased by 1.68 in the past ten years.(3)Using the method of spatial autocorrelation,from the perspective of global autocorrelation: the probability of randomly generating clustering patterns in 2008 and 2018 is less than 1%,which shows that their spatial clustering is relatively low.From the perspective of local autocorrelation: According to the LISA clustering distribution map,in 2008,the spatial autocorrelation of more than 50% of the administrative villages in Taihu County’s cultivated land quality grade is not significant,among which the administrative villages of the aggregate type(HH type and LL type)are distributed.It accounts for 22.83%,and the administrative villages with discrete(HL type and LH type)distribution account for 7.07%.In 2018,the spatial autocorrelation of 38.59% of the administrative villages with cultivated land quality in Taihu County was insignificant,of which 57.61% were administrative villages with aggregate(HH and LL)distributions;and discrete(HL and LH)distributions.Administrative villages accounted for 3.80%.From the Moran scatter plot,it can be seen that there is a clustering relationship in the areas with high level of cultivated land quality in Taihu County in 2008,and the local correlations in the remaining areas are small;there is a strong correlation between the local cultivated land quality in Taihu County in 2018,showing obvious clustering trend.(4)Based on the results of the local autocorrelation of Taihu County in 2018,a divisional protection and promotion plan for the cultivated land in Taihu County was proposed.According to the distribution of the accumulation type(HH type,LL type,HL type,LH type),they were designated as Restricted construction area,comprehensive improvement area,moderate improvement area and key remediation area.Aiming at the problem of cultivated land quality in Taihu County,technologies for improving acidified soil,improving cultivated land leveling,improving fertilizer reduction and increasing efficiency,and improving contaminated soil were proposed.