Spatial Variability Of Cultivated Land Quality In Shaanxi County Based On Geostatistics

The cultivated land is the basis and guarantee of the survival of humans,since twenty-first Century,with the development of social economy,city level and industrialization level continues to improve and enhance the quality of cultivated land,area reduction,land pollution and other problems become more serious,and difficult to reverse and decrease in the quantity of cultivated land,cultivated land quality problems will become increasingly prominent.At the present stage,the study of cultivated land quality should not only study its evaluation,but also study its dynamic monitoring and spatial variation..In this paper,Zhen’an County,,Dali County,Zhidan County of Shaanxi Province as an example,the quality of cultivated land utilization,three kinds of natural and economic index as spatial variables,with statistical methods,analyze the characteristics of spatial variation of different types of regional cultivated land quality and variation law,draw the following conclusions:(1)The economic attribute of Zhen’an County farmland quality,natural attribute,the quality of cultivated land in Zhidan County of Dali,the quality of cultivated land utilization,natural and economic attributes,the best fitting model of the six index was calculated as index model;cultivated land quality,the use of natural Zhen’an County,the best fitting model for the linear model;best fitting model of Dali economy for the spherical model,indicating the quality of cultivated land in different regions are the attributes of a certain spatial correlation.The range of three kinds of index of County town of Dali County and calculated were higher than that of Zhidan County,nature,utilization,economy that cultivated land quality in different study areas are affected by the outside size is different,the reason is the difference lies in the influence of natural conditions and human activities.(2)The main spatial variability of cultivated land quality in Zhenan County impact to random factors,and the spatial variability of utilization and economy is dominated by structural factors,the effect of three kinds of cultivated land quality structural factors were: 25.18%,59.97%,88.96%;Dali County cause three kinds of spatial difference of cultivated land quality is the structural factors,the effect of three kinds of cultivated land the quality of the structural factors were: 88.02%,93.94%,76.36%;consistent reason and Dali County difference space quality of cultivated land in Zhidan County,which belongs to the structural factors,structural factors affecting the natural quality and utilization quality and economy are as follows: 88.53%,88.52%,88.74%.(3)Distribution rules of spatial change of cultivated land quality in Zhidan County,Dali Town,and regional spatial structure,the quality of cultivated land in Zhenan county showed great variation in northwest southeast direction,east-west direction variation;variation range of cultivated land quality in Dali County in different directions are different but the changes are relatively small,compared to flat;Zhidan county range difference changes in the northwest southeast direction of the larger.(4)Using ordinary Kriging interpolation method,choose the best fitting model drawing data interpolation,spatial distribution,the different properties of different regions from the figure,with spatial heterogeneity,spatial heterogeneity between different regions of the same attributes and show similarities to a certain.(5)The variation rules of the variation of cultivated land quality in different areas,the quality of cultivated land after the effective monitoring work has a good suggestion guidance,the quality of cultivated land change reflects the maximum correlation distance,that after the set monitoring network to the reference range,can make the network more scientific effective layout,avoid blindness.