晋中盆地土壤氮元素空间异质性研究  

Study on Spatial Heterogeneity of Soil Nitrogen in Jinzhong Basin

作　　者：曹霄霄 王应刚[1] 苏尚军[1] 郭星 张婷[1] 

机构地区：[1]山西大学环境与资源学院,山西太原030006

出　　处：《山西农业科学》2017年第10期1634-1637,1681,共5页Journal of Shanxi Agricultural Sciences

基　　金：国家自然科学基金项目(31070424)

摘　　要：土壤氮元素是植物需要最多的营养元素,大尺度研究土壤氮元素的空间变异结构,有利于系统地掌握当地土壤中氮的变异状况,便于科学管理。通过随机采样得到晋中盆地215个样点,分别提取0~20 cm土壤样品中的全氮含量,并采用半方差函数模拟及克里金空间插值分析土壤中氮元素变异结构与空间分布特征。结果表明,土壤中全氮含量的平均值为0.79 g/kg,与国家二级养分分级标准相比,处于缺乏状态;盆地内不同地点的土壤全氮含量差异较大,变异系数为47.67%,属于中度变异;通过半方差函数的4种模型模拟效果来看,指数模型模拟效果最好,氮元素结构方差比为0.504,具有中等空间自相关性;盆地中部河流两岸全氮含量高于盆地边山区,高值区与低值区呈斑块状分布,其中,最高值区分布于太原、清徐、榆次、太谷交界区域,最低值区分布于盆地西南部边山区的孝义市大部分地区。Soil nitrogen is the most nutrient element for plants. The spatial variability of soil nutrients in a large scale, which is helpfid to grasp the variation of soil nutrients in the system, and to facilitate the scientific management of soil nutrients. In this paper, 215 samples of Jinzhong basin were obtained by random sampling. The total nitrogen content was extracted at each sampling point, and the collected depth was 0-20 cm. The paper analyzed the soil nitrogen variation structnre and spatial distribution characteristics by using ~he semi variance fimction simulation and Kriging interpolation. The resuhs showed that the average content of total nitrogen in soil was 0.79 g/kg, which compared with the national level two nutrient classification standards and was in a lackof state and the coefficient of variation was 47.67%, belonging to moderate variation. The simulation results showed that the exponential model fit best, with moderate spatial autocon＇elation. The total nitrogen content in both sides of the river basin was higher than that of the mountainous area. The area of extreme displayed pathy distributions, including the maximum nitrogen content distributs in Jinyuan district of Taiyuan city, Qingxu county and the border area of Yuci district and Taigu, and the minimun nitrogen content in the southern part of Xiaoyi.

关 键 词：氮元素N 半方差函数 克里金插值 晋中盆地 

分 类 号：S153.6[农业科学—土壤学]