Study On Spatial Difference Of Soil Nutrients In Different Regions Of Anhui Province

The research on the spatial variability of soil nutrient,especially for the quantitative process of nutrient index,can improve the efficiency of water and fertilizer use in agricultural production activities and improve the field management,especially the implementation of"precision agriculture"which is advocated in our country.Profoundly instructive.In the process of spatial variability of soil nutrients,GIS and geostatistical tools are needed for qualitative and quantitative analysis.GIS is more focused on spatial representation and query analysis of geographic elements.Geostatistics is more focused on spatial structure analysis,simulation and interpolation of certain regional variables.At present,the combination of the two trend is very obvious.Based on the current evaluation of cultivated land fertility and soil testing and fertilization in different regions of Anhui Province,this paper combined with the basic principles and methods of geostatistics,and with the Geostatistical Analysis?Geostatistical Analysis?and spatial analysis module?Spatial Analysis?,and the use of the current domestic soil testing and fertilization and fertility evaluation of the most widely used ordinary Kriging interpolation method?Ordinary Kriging?in different parts of Anhui Province,the most representative of the six areas of soil Nutrient mixed sampling point data were analyzed statistically and spatial interpolation,and the results of soil nutrient analysis in different regions of the province were compared and analyzed.At the same time,GS+software was used to simulate the soil nutrient samples in each study area,The interpolation model and some core parameters are adjusted and optimized,and the error coefficient of the spatial interpolation prediction is calculated by using the independent data set accuracy verification method,and the prediction accuracy is evaluated and compared.The main results of this paper are as follows:?1?In the case of the interpolation method and the basic conditions such as the spatial sampling range and sampling scale of the soil sampling point,the accuracy of the spatial interpolation prediction is increasing from south to north for the two indicators of soil pH and organic matter content And the spatial interpolation of the plains in the north of Anhui Province is better.For the two indicators of available pHospHorus and available potassium,the interpolation accuracy shows the overall trend of decreasing from south to north,and in the low hilly areas of southern Anhui Spatial interpolation is more effective.?2?The spatial variability of soil nutrients in different regions of the province is dominated by moderate variation.From the aspects of soil nutrient variation coefficient,the spatial variability coefficients of soil nutrient elements in the study area were higher and the spatial variability were higher in the study area,and the spatial variability was all between 10%and 100%The spatial variability is generally in the middle level.From the results of semi-variability analysis of soil nutrient data,the ratio of gold value to base value of soil nutrient data in each study area is in the range of 25%⁷5%of C0/?C0+C?,belonging to medium spatial correlation.The C₀/?C₀+C?of the soils in the central region is generally small,the range is relatively small,the spatial correlation is the highest,and the C₀/?C₀+C?in the northern and southern regions is relatively large,and the space Relatively low degree of correlation.Different regions,different terrain conditions for spatial correlation is more obvious.?3?In general,the spatial variability of soils in hilly areas of southern Anhui is higher than that in Anhui and northern Anhui,and the spatial variability is increasing from north to south,and belongs to the southern hilly areas The degree of spatial variability is often greater than that of the northern and central regions.In summary,terrain and geomorphologic factors have an important effect on the spatial variability of soil nutrients.?4?From the spatial distribution of five soil nutrients in each region,it can be seen that the spatial distribution of soil nutrients in different regions and different species in the same area is quite different.Which soil available potassium and trace elementsThere are obvious differences between the spatial distribution and variation characteristics of available zinc and other three nutrient elements.The spatial distribution and variation characteristics of these two nutrient elements do not show obvious regularity in the region,especially Trace elements effective zinc,the regional distribution of more complex and varied,and a large number of elements of the spatial distribution and variation of the situation is relatively single.