Geostatistical analysis of spatial heterogeneity of soil acidity
Abstract
The article analyzes the role of the geostatistical analysis in the study of soil properties using the example of acidity. The evolution of approaches to the use of geostatistics in geography and soil science is described, the urgency of further using the geostatistical approach to study the heterogeneity of soil properties and for increasing the efficiency of applied soil use is shown. Based on experimentally obtained data on the acidity of soils in the key sites of forest, meadow and arable land studied, the application of the geostatistical approach was consistently described. The expediency of preliminary statistical data processing and analysis of the asymmetry and kurtosis parameters is shown. The necessity of using the variography and the importance of the correct choice of mathematical models, which are used in constructing the charts, are explained. The best methods of interpolation were determined, which were simple and ordinary kriging, with the help of which the cartograms of the distribution of acidity were plotted in the investigated areas. This made it possible to determine the degree of heterogeneity in the distribution of the acidity of soils in different parts of the terrain to study the heterogeneity of soil properties under different types of land, at different hypsometric levels and the presence of spatial patterns. A significant spatial autocorrelation of soil acidity data is noted in the floodplain area, since the ratio of nugget to the threshold is only 4 % and a significant reverse correlation of pH values with absolute terrain heights is established. The pH value is clearly differentiated from the degree of moistening of the soils – it significantly increases from automorphic soils to gley soils, which is due to the nearneutral ground water reaction in the flood plain.
For citations:
Klebanovich N.V., Kindeev A.L. Geostatistical analysis of spatial heterogeneity of soil acidity. Natural resources. 2018;(1):138-147. (In Russ.)
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