秦巴山区汉阴盆地耕层土壤全氮的空间变异特征及其影响因素研究  

Spatial Variability of Total Nitrogen in Hanyin Basin,Qin-Ba Mountain,Shanxi and Its Influencing Factors

作　　者：宋利珍[1] 常庆瑞[1] 方睿红[1] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《西南农业学报》2011年第5期1833-1837,共5页Southwest China Journal of Agricultural Sciences

基　　金：国家自然科学基金(30872073);国家科技支撑计划项目(2006BAD09B0603)

摘　　要：利用GPS定位,在陕西省汉阴县采集耕地表层土样(0～20 cm)1500个,应用经典统计学与地统计学方法,对汉阴县耕层土壤全氮含量的空间变异特征进行了研究。结果表明:汉阴县土壤全氮的平均含量为1.20 g.kg-1,为中等偏上水平;土壤全氮的变异系数为0.31,为中等变异程度。通过各向同性和各向异性的半方差模型分析可得,汉阴县全氮含量空间变异以各向同性指数模型拟合效果最好,其块金系数为0.425,表明全氮空间变异主要是由结构性因素引起的。土壤全氮空间分布呈现中部高、东北和西南低的趋势,这主要受当地地形、土壤类型和施肥状况等因素的影响。A total 1500 topsoil（0-20 cm） samples were taken across Hanyin basin in Shanxi province with geographic position system.The classic and geostatistical methods were used to research on the spatial chatacteristics of total nitrogen.The results showed that the average TN content was at moderate leves of soil fertility,1.20 g/kg.The coefficients of variation for TN were 0.31.Analyses of the semi-variance models indicated that the best theoretical models was exponential one.The ratio of nugget/still of soil available Potassium was 0.425,and the spatial autocorrelation belonged to middle intensity.It showed that the spatial vatiability of total nitrogen was controlled by spatial structure.Spatial distribution of total nitrogen was influenced by local terrain,soil type,fertilization conditions.

关 键 词：全氮 空间变异 地统计学 

分 类 号：S158[农业科学—土壤学]