Spatial Variability And Evaluation Of Soil Nutrients In Desert Savanes In NingXia

Research on the soil spatial variability, especially the study of the quantization process.Has the important significance on the improvement of the farmland water use efficiency and the improvement of the-field management. Especially the implementation of "precision agriculture (?). Due to the soil is affected by soil parent material, topography and other natura factors and human activities and other factors. Makes soil inhomogeneity changes in the space-time continuum, and with a high degree of spatial variability. Focuses on the analysis of regional spatial structure variables in statistics, simulation and spatial interpolation. and GIS focuses on the space display and query, the combination of the two has a very quickly development trend at present. This article selects in the bamboo slips of NingXia hui autonomous region Sunjiatan park as the research area, using the method of combining statistics and GIS technology. Study the soil organic matter alkali of nitrogen, phosphorus, potassium, total nitrogen,total phosphorus and spatial variability of pH and its distribution in this area, and mapping the spatial distribution of soil nutrient content. Analyze the factors which influence spatial variability of soil nutrient, evaluation of soil nutrient status, discusses the feasibility of regionalized management of soil nutrients, with a view to the construction of ecological agriculture in the region and provide scientific basis and reference for reasonable fertilization and soil ecological environment protection etc.. The main conclusions are as follows:(1) Have strong spatial correlation0-20cm soil available nitrogen, available potassium and available phosphorus, pH, total nitrogen, organic matter had medium spatial correlation.20-40cm soil pH, total nitrogen and total phosphorus of nugget values are minimum, illustrate the variability in the minimum spacing within the analysis error caused in the process of small. Effects of soil total nitrogen and organic matter content distribution of structural factors is very strong.(2)0-20cm soil pH showed variation pattern better, the overall performance of the East West high-low; nitrogen content by both sides to the Middle East decline in distribution of the entire study area performance; distribution of K space show variation pattern of decreasing from the southwest to the Northeast; total nitrogen content was higher than that of the eastern in the eastern region, and the total nitrogen content decreased gradually from the west to the East; the total phosphorus content of a gradually increasing trend from west to East in the distribution of the entire study area performance; overall pattern of spatial distribution of organic matter is from west to East, gradually increasing from north to south.20-40cm soil pH is the minimum change in the study area all soil fertility index,8.5-9.54is the range of available potassium content region; the region with the highest in Western and north-central large place; the lowest content area in the park north of the border region and the southern and south-central small area; distribution characteristics of soil nitrogen content showed massive, mutual inclusion, distribution and available potassium were generally similar, things distribution difference of total nitrogen in soil was significantly correlated with the organic matter, spatial distribution, decreasing from west to East, parts of present plaque distribution; distribution characteristics of soil organic matter content decreased gradually from east to west, and in the central area of small content areas of high available phosphorus; spatial variability of soil structure and-20cm similar, showing ten reciprocal chimeric level area together, high background values of staggered distribution; the content of total phosphorus in soil is massive, distribution characteristics of mutual inclusion, the overall distribution, from east to west, from south to north, reduce.(3)0-20cm and20-40cm7soil nutrients showed a moderate spatial correlation, suggesting that their spatial variability is influenced by structural factors and random factors, which affect the human activities such as the random factors has been nearly half.0-20cm soil the lowest level, in the large area of southern boundary and the East in the study area, the highest level in the study area the area of the northwestern boundary of the large area and western small area;20-40cm soil nutrient comprehensive index ranks lowest area in the research area of the southwest, central and eastern boundary of small areas of small local area content the highest in the study area.