Study On Spatial Variability Of Soil Properties In Different Geomorphologies

The configuration and forming process of soil is very complex and soil properties have high spatial variability. Human activities further strengthened the variability. It is significant to study the spatial variability of soil properties in different landforms for carry out precision farming in China.This paper was based on the data of soil fertility survey of Yizheng, Jiangsu Province in 1994. The county can be divided into two regions according to the landform, hilly area and plains area. The area of hilly area is 685 sq.km., and the area of plains area is 215 sq.km.. 448 soil samples were collected in the hilly area 157 in the plain area. SPSS 12.0 and Geostatistical Analyst of ARCGIS 8.3 were used to analyze and compare the spatial variability of four kinds of soil properties,pH, organic matter, available phosphorus and potassium. Advisable number of soil sampling in a given area had been suggested in this paper. Research results were as followed.In the original data, there was being a strong deflexion effect on soil available phosphorus in two areas and soil pH in plains area. Soil available phosphorus could be normal distribution through logarithm conversion. The other soil properties basically obeyed normal distribution. Coefficients Variation of soil properties in twos areas showed that: Soil pH has the lowest spatial variability (below 10%). Available phosphorus showed the highest spatial variability (above 75%). Spatial variability of three kind's soil property in hilly area was more notable than in plains area except...