不同地形部位耕地微量元素空间变异性研究──以永济市为例

SPATIAL VARIATION OF TRACE ELEMENTS WITH LANDFORM OF FRAMLAND ──A CASE STUDY OF YONGJI CITY

在永济市耕地资源管理信息系统和传统地统计学的支持下,以半变异函数为主要工具,通过GS+软件对永济市耕地土壤的6种微量元素的空间变异特征进行了初步研究。结果表明,研究区耕地土壤中6种微量元素中Zn和Mo属于中等变异强度的范围,Fe、Mn和B属于中等偏低的变异强度范围,而Cu则在河漫滩区属于中等变异强度,在其他地形部位则表现为中等偏低的变异强度。河漫滩区微量元素Cu、Zn和Mo,盆地区微量元素Zn、B、Mo,丘陵区微量元素Zn、Mo以及山地区的Zn和Mo属于中等变异强度,其他则属于中等偏低的变异强度。丘陵区6种微量元素含量在所研究的尺度上的总变异中既受到自然因素所引起的空间变异影响,同时也受到一些随机因素的影响,影响力为中等尺度;河漫滩区6种微量元素含量的总变异具有强烈的空间相关性,说明在河漫滩区自然因素对空间格局的影响起主导作用。通过对研究区耕地土壤中6种微量元素的统计特征与空间变异性分析,为进一步合理地进行土地利用规划提供了理论依据,并且对土壤养分综合管理以及进行土壤改良和耕作都具有一定的指导作用。

With the aid of the Farmland Resources Management Information System of Yongji City, the traditional geo-statistics, semivariance function, and the GS+ software, characteristics of spatial variation of 6 trace elements in the farmland soil in Yongji City were studied. Results show that among the 6 trace elements, Zn and Mo are medium in variation intensity; Fe, Mn and B, medium on the low side and Cu medium only in flood land, but medium on the low side in soils under other landforms. Cu, Zn, and Mo in blood land, Zn, B and Mo in basins, Zn and Mo on hills and Zn and Mo on mountain are all medium, but medium on the low side in soils under other landforms. In the hill area, the total spatial variation of the 6 trace elements does not only show impact of natural causes, but also those of human activities or random factors, whereas in the flood area, it does a strong spatial relativity, indicating that natural cause is the leading factor. The research on the statistical characters and the semi-variance structure of the 6 trace elements can provide land use programming with scientific basis and, overall management of soil nutrients, soil amelioration and cultivation with guidelines.