Title: Spatial variability of available nutrients contents in cropland soils in Gaoyang County of Hebei Province, China
Abstract:This study used GIS and geostatistics to analyze the spatial variability and content distribution of available N,P and K as part of a comprehensive management of soil nutrients in Gaoyang County of He...This study used GIS and geostatistics to analyze the spatial variability and content distribution of available N,P and K as part of a comprehensive management of soil nutrients in Gaoyang County of Hebei Province.Results showed that available N and P distribution was lognormal while that of available K was normal.The averages of soil available N,P and K were respectively 76.32 mg.kg 1,22.28 mg.kg 1 and 128.34 mg.kg 1.The coefficients of variation ranged from 36.11% to 79.71%,which suggested that the variations were at medium levels.The result showed that C0/(C+C0) of available N,P and K were respectively 38.79%,74.27% and 32.33%,which suggested moderate spatial self-correlations.The spatial variability was caused by structural and random factors.Available K had the longest correlation range(51.94 km),available P the shortest(1.05 km) and that of available N was 43.96 km.Integrated comparisons in interpolation errors were conducted,and the best theoretical model of semivariogram of soil available N,P and K were established,which turned out to be spherical,exponential,spherical models,respectivley,with preferable 0-order trend effect.Spatial distribution maps of available N,P and K contents in cropland soils constructed by using universal Kriging interpolation objectively reflected nutrient abundance/deficiency in the study area.The maps suggested that the characteristics of the spatial distribution of available N was insignificant,available P was mainly with a banding distribution and available K was with both banding and island distribution.The content of available N was low,the area of land with 60~90 mg.kg 1 available N accounted for 93.13% of the investigated region.This suggested that there was the need to increase soil nitrogen in the study area.The contents of available P and K were in the medium-to-high range in most of the study area.Also the spatial distribution of available P showed that areas of low,medium,high and very high grades were respectively 0.34%,31.97%,46.98% and 20.71% of the study area.Available K map showed that the areas of low,medium,high and very high grades were respectively 0.04%,40.36%,54.12% and 5.48% of the study area.The figures of the GIS-based nutrient variability reflected the spatial distribution of soil nutrients and provided the theoretical basis for decision-making and soil nutrient management in the study area.Read More
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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