Application of geostatistics in the research of environmental field of farmland protection forest.
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Abstract
In this study, the goestatistical method was applied to analyze the environmental field of farmland protection forest in Changtu County, Liaoning Province. Environmental factors, including wind speed, soil moisture content, and soil temperature of typical forest networks, were measured both in spring and summer, and the spatial characteristics of environmental factors were analyzed. Results indicated that the wind speed, soil temperature and soil moisture content in spring and summer all followed a normal distribution. The variances were related to spatial scale, and the structural factors were main causes. Wind speed in spring was much higher than that in summer; but the degree of variation was smaller than that in summer. Simultaneously, wind speed increased with height both in spring and summer; variation degree decreased with height in summer but increased in spring. The variance of wind speed all fit a exponential model except that at 2 m height in summer which fit a spherical model. The rank of spatial autocorrelation of wind speed was 1 m in spring 1 m in summer 2 m in spring 2 m in summer, and the positive correlation was ≤200 m in spring and ≤128 m in summer. The rank of heterogeneity percentage caused by spatial structure was 2 m in summer 1 m in summer 1 m in spring 2 m in spring, and the fractal dimension D was 1 m in summer 1 m in spring 2 m in spring 2 m in summer. The soil temperature in spring and summer both fit a spherical model, and the spatial autocorrelation in spring and summer was 282 m and 127 m, respectively. Both the heterogeneity caused by spatial structure and fractal dimension D were bigger in summer than that in spring. The soil moisture in spring and summer both fit a exponential model. The spatial autocorrelation in spring was bigger than that in summer, which was both less than 100 m. Both the heterogeneity caused by spatial structure and fractal dimention D were bigger in summer than that in spring.
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