摘要
土壤养分连续空间分布数据是土壤信息系统工作的基础,土壤养分空间插值的研究因此变得尤为重要。对陕西省周至县北部猕猴桃适生区土壤进行采样,以对猕猴桃生长作用较为密切的土壤速效钾含量为研究对象,用普通克里格(OK)、样条函数(Sp line)、趋势面拟合(TSA)、距离权重反比法(IDW)等常用插值方法对采样点进行插值获取土壤速效钾空间分布图,进行交叉验证,结果表明能够反映出结构性影响的克里格插值方法明显优于其它方法,其中又以球形模型为最佳,样条函数、距离权重反比法在采样点密集区也能内插出较好的效果,但其受采样点密度影响较大,在采样点稀疏的地区内插结果较差。
Continuous soil nutrient data is the basic data of soil information system, soil nutrient spatial interpolation study becomes very important because it can affect the data reliability of soil nutrient data straightly. In this study, soil available kalium data, Zhouzhi county, Shaanxi province, is sampled and got the interpolation map of available kalium with OK, IDW,Spline and TSA according to interpolating sampling points. The cross validation results showed that OK is the best which used spherical model in these methods; although Spline and IDW could also produce fair and reasonable results, both of them were sensitive to sampling density, interpolation result appeared large prediction errors in those regions which had exiguous sampling points,
出处
《水土保持学报》
CSCD
北大核心
2006年第2期68-72,共5页
Journal of Soil and Water Conservation
基金
霍英东青年教师优选资助课题(94005)
西安市科技攻关项目(编号:GG04108)
