Based On Gis And Geostatistics, Spatial Variation Of Soil Characteristics

In recent years, with the aggravation of agricultural nonpoint pollution and the rapid development of precision agriculture, the analysis of spatial variance of soil nutrients is becoming a focus and getting more and wide attention. To analyze spatial variance of soil nutrients is not only the foundation of practicing precision agriculture , but also is necessary for controlling agricultural area pollution and realizing the sustainable development of agriculture. Therefore, we choose a farmland (which area is 451. 7hm~2) in Mashan town in Shaoxing city of Zhejiang province as the studying area to study the spatial distribution and variability of five types nutrients by using the method of combination of GIS and geostatistics. The studying results can supply scientific foundation for appropriate fertilization , site-specific management and control effectively agricultural nonpoint source pollution in local area .This article is made up of six chapters. Chapter 1 is the introduction, which introduces the studying background and points out the studying meaning, then puts forward the technique routes and position of the article .Chapter 2 introduces the methods in studying spatial variance of soil nutrients, including traditional statistical analysis , geostatistics analysis and the method of combination of GIS and geostatistics. Chapter 3 explains the general situation of studying area , the methods of collecting soil samples and analysis these samples in laboratory.Chapter 4 and chapter 5 studies the spatial distribution and the variability of five types nutrients , such as available nitrogen, available phosphorus, available kalium, organic matter, pH, etc, which help us make some conclusions: (1)the variable coefficients of five types nutrients are in the range of...