Effects Of Sampling Methods On Spatial Distribution Of Soil Nutrients

The spatial variability of soil nutrients is a characteristic of the soil itself.The study of spatial variability of soil nutrients is of great significance to guide the application of fertilizers and precision agriculture.In this paper,four kinds of soil nutrients,such as total nitrogen,available pHospHorus,available potassium and organic matter,were selected in combination with traditional statistical methods,geostatistics methods and spatial interpolation methods.From their variation coefficients,kurtosis,And the spatial variability of the four kinds of nutrients were analyzed,and the spatial distribution of soil nutrients in different sampling methods was compared.By comparing the results can be an intuitive understanding of Shouxian Institute selected four kinds of nutrients in the region of the distribution of the situation,can guide the Shouxian agricultural rational fertilization,improve agricultural production efficiency.The main results are:(1)The analysis of soil nutrient accuracy: the root mean square error of both the plain root and the postganglionic interpolation,whether it is the root mean square error of the ordinary Kriging interpolation result or the inverse distance weight interpolation interpolation,Mixed sampling is small.It is shown that the two kinds of terrain of plain and post are under different interpolation conditions,and the grid single sampling ratio is higher than that of mixed sampling.It also shows that the mixed sampling of the two terrain grids is better.(2)Two kinds of interpolation method precision analysis: plain and post two terrain,net single point sampling and mixed sampling,compared with ordinary Kriging interpolation and inverse distance weight interpolation.Under the same terrain and same sampling method,the root mean square error of soil nutrient Kriging interpolation is generally smaller than that of soil nutrient inverse distance weighting,which indicates that in the Shouxian plain sampling area and post area sampling area The interpolation of gold is higher than that of inverse distance weight interpolation.(3)Two kinds of topographic interpolation precision analysis: the same kind of sampling method and the same interpolation method,compared the accuracy of the two terrain interpolation,plain grid single point sampling interpolation prediction accuracy than the grid grid single point sampling interpolation prediction accuracy,also shows Compared to the post,the plain is more suitable for grid single point sampling.