County Soil Nutrient Analysis Evaluation Based On Gis

Soil is the foundation of agriculture existence, the status of the soil nutrientcontent is an important symbol of the soil fertility. For better protection and rational use ofarable land, to grasp soil nutrient status and its dynamics, use Baoding, Gaoyang of HebeiProvince as an example,get through the studies of GIS-based county territory soil nutrientanalysis and evaluation, utilize test data of formula fertilization by soil testing of Gaoyang,use statistical analysis module to interpolation processing to the sampling point of soilnutrient data in ArcGIS platform, generate spatial distribution maps of major nutrients.Based on space distribution of nutrients and nutrient content to analysis of spatial andtemporal contrast, a reasonable fertilizer recommendations.This study first conducted the selection of the most important in the process ofinterpolation method research of nutrient drawing.This article select three commonly usedinterpolation method of kriging, inverse distance weighted and radial basis function, tointerpolation analysis comparison to eight kinds of nutrient distinguished of organic matter,hydrolytic nitrogen, rapidly available phosphorus,rapidly available kalium, available zinc,available iron, effective manganese and effective copper, reached the tension splinefunction and the rules spline function in the radial basis function had better effect; inkriging interpolation method, organic matter matching better with linear model, rapidlyavailable phosphorus,rapidly available kalium, available iron, effective manganese,effective copper and available zinc were all matching better with sphericalmodel.Compared cross-validation results of4interpolation method, respectively, to assessthe mean error (ME) and root mean square error (RMS), the results obtained, ordinarykriging was significantly better than the other three methods. Compared interpolationresults with the actual value found that the ordinary kriging interpolation results are morecloser to the actual value. On the basis of the result of the interpolation, to produce thecorresponding nutrient content figure.The study explored the Kriging method is more suitable for analysis and evaluation ofthe county soil nutrient content and nutrient drawing production, distribution of time andspace on Gaoyang soil nutrients were analyzed and evaluated and produce nutrient drawing.Analysis and evaluation the2010Gaoyang soil nutrient status, and rank the Gaoyang soil nutrient to different levels, derived99.9%organic matter in the Gaoyang soil nutrientcontent wee in the four level, the overall performance of the county for the content ofmedium;78.11%hydrolysis nitrogen were in4level, the overall performance of the countyfor the content of medium; more phosphorus content were in3and4level, accounting for33.63%and44.12%of the total distinguished,21.27%of the phosphorus content relativelack of were in5and6level, the overall performance of the county for the content wasabove average; kalium were more of grade3and4, occupied the total amount of90.72%,county overall performance for medium levels; effective zinc content increased year byyear, the county effective zinc of topsoil were in2and3level,2level of which accountedfor50.88%and3level accounted for48.78%; valid manganese content in2and3level,2level accounted for51.07%; most of the available copper content in soil in the2and3level, accounting for99.63%, which accounted for82.76%of the level of2; most of theeffective iron content in the1and2level, accounting for about99.75%,1level accountedfor62.87%. Compared with the1980s, soil nutrients content of organic matter, hydrolyticnitrogen, available phosphorus of overall increase, overall decline of soil availablekalium.At the same time as the change of time, soil nutrient on the space also appears ofchange in different degree. According to the current situation of the nutrient content of soilavailable phosphorus is about21.27%of5and6level soil nutrient deficiencies, the otherarable nutrient content should be on the basis of maintained at the original amount offertilizer to rational and efficient use of fertilizers. This study have positive significance toscientific analysis and management of the county soil nutrient.