豫中烟区植烟田土壤pH和阳离子交换量的空间变异性研究  

Spatial Variability of Soil pH and CEC in Tobacco Planting Fields in Central Henan Province

作　　者：陈海生[1] 王素娜[2] 

机构地区：[1]浙江同济科技职业学院,浙江杭州311231 [2]平顶山学院,河南平顶山467000

出　　处：《西南农业学报》2016年第2期342-345,共4页Southwest China Journal of Agricultural Sciences

基　　金：国家烟草专卖局重点资助项目(110200401021)

摘　　要：在地统计和GIS的支持下,以半方差函数为工具,对豫中植烟田土壤pH和阳离子交换量(CEC)的空间变异特征进行了研究。结果表明,研究区土壤pH、CEC均为正态分布,土壤pH平均值为7.42,土壤CEC平均值为11.36,土壤pH变异系数只有6.09%,而土壤CEC的变异系数为32.69%。土壤pH符合高斯模型,土壤CEC符合指数模型。土壤CEC的块金效应为25%,空间相关性较强;而土壤pH的块金效应为32.9%,具有中等程度的空间变异性。豫中植烟田土壤pH和CEC的等值线图可更准确和直观地了解其在研究区的分布情况,从而为精确施肥提供依据。Geostatistics method and geographic information system （GIS） techniques were applied to study the spatial variability of soil pH and CEC in tobacco planting fields in central Henan province. Geostatistics analysis was carried out, including calculation of experimental variograms and model fitting. The results showed that the soil pH and CEC in tobacco planting fields were normal distributions, the average value of soil pH was 7.42, and soil CEC was 11.36 ; The variation coefficient of soil pH was smaller, which was 6.09 %, while the varia- tion coefficient of soil CEC was larger, which was 32.69 %. Analysis of the isotropie variogram indicated that soil pH in the study regions was well described with gauasian model, and soil CEC was well described with exponential model. The nugget effect of soil CEC was 25 %, suggesting strongly spatial dependence, while the nugget effect of soil pH was 32.9 %, suggesting medium spatial dependence. The maps Generated by kriglng also distinctly revealed the distribution of soil pH and CEC in tobaccoc planting fields in the study regions, which provid- ed the basis for precise fertilization.

关 键 词：地统计 空间变异性 土壤PH 土壤CEC 

分 类 号：S572[农业科学—烟草工业]