京东板栗主产区土壤氮磷钾的空间变异

Spatial variability of soil N,P,and K in main production area of Castanea mollissima

采用经典统计学和地统计学相结合的方法,对京东板栗主产区迁西县土壤氮、磷、钾的空间变异进行了分析.结果表明:迁西县土壤全量氮、磷、钾和速效氮、钾的含量普遍较低,但表层土壤速效磷含量较高;氮、磷、钾的空间分布均表现为中等变异,且以磷的变异最大.表层土壤全氮和碱解氮的分布符合高斯模型,其空间变异主要由结构性因素决定;全钾和速效钾的分布分别符合球状模型和高斯模型,前者空间变异受结构性因素和随机性因素的共同影响,空间相关性为中等;后者主要受结构性因素的影响,空间相关性强烈.氮、钾在全县范围内的空间分布特征相似,高值区均出现在县域南部和西北部,而中部和东北部的含量较低.全磷的高值区主要分布在该县北部,速效磷高值区则分布在县区南部.氮、钾全量和有效态含量之间存在极显著正相关关系,但全磷和速效磷含量的相关性不显著.

By using the methods of classic statistics in combining with geo-statistics,this paper analyzed the spatial variability of soil N,P,and K in the main production area of Jingdong chestnut,Qianxi County of Hebei Province.In the study area,the contents of soil total N,P,and K and soil available N and K were lower,but the available P content in topsoil was higher.The soil N,P,and K had a medium variability of distribution,and soil P had the largest coefficient of variation.In topsoil,the distribution of total N and available N fitted Gaussian model,and their spatial variability was mainly affected by structure factors.The distribution of soil total K and available K fitted spherical model and Gaussian model,respectively.The spatial variability of soil total K was co-affected by structure factors and random factors,and had a medium spatial correlation;while the spatial variability of soil available K was mainly affected by structure factors,and had a strong spatial correlation.At county scale,soil N and K contents were higher in the south and northwest than in the middle and northeast,soil total P content was higher in the north,and soil available P content was higher in the south.Soil total N and K had significant positive correlations with soil available N and K;while soil total P had no significant correlation with soil available P.