The Spatial Variability of Soil Nutrients and Water in the Field-scale of Typical Red Soil Region

The typical red soil samples were collected from the surface soil layer(0-20 cm) and the deep soil layer(20-40 cm) by classic statistics and geostatistics methods.Using geostatistics analysis can explicitly express the spatial variability of soil water content,total nitrogen,nitrate and organic matter.The results showed that all soil parameters were normal distribution.The content of total nitrogen and organic matter were increasing with the depth of soil layer reducing,and the nitrate was opposited.The nitrate variation coefficient(41.80%-61.97%) of two soil layers were higher than that of total nitrogen and organic matter(6.21%-19.29%).The change scales of soil water content,total nitrogen,nitrate,organic matter were from 13.50 m to 32.60 m.Total nitrogen and organic matter showed significantly positive correlations.The nitrate and soil water content showed significantly negative correlations(P 0.01,n=96).The classical statistics and geostatistics method could be used to study the spatial variability of soil moisture,total nitrogen,nitrate and organic matter in typical red soil region,which was the scientific basis for precision fertilization,irrigation and other managements.