天津地区土壤环境中若干元素的群分析

运用群分析的数学方法,将天津地区260个潮土样品中十五个化学元素分为三组:第一组Sr、Zr与土壤中小于0.01mm的物理性粘粒含量呈极显著负相关;第二组Fe、Ti、Co、Ni、Zn、Li、Cr、Pb、Cu、As、Mn与土壤小于0.01mm的物理性粘粒含量呈极显著正相关;第三组Hg、Cd则与土壤质地无关.因此.在母质相同的地区或近代冲积物和沉积物为母质的地区,研究土壤背景值时,必须充分注意土壤质地类型对土壤中某些元素背景值的影响,并且,应求出不同质地类型土壤的背景值,将更具有实际意义.

CLUSTER ANALYSIS OF SOME ELEMENTS IN SOILS OF TIANJIN AREA

Some 15 chemical elements from 260 samples of chao soil in Tianjin region were divided into three groups by using mathematical method of cluster analysis. In the first group, there were Sr and Zr, which showed strikingly negative correlation with physical clay content<0.01mm in soils. In the second group, there were Fe, Ti, Co, Ni, Cr, Pb, As, Cu, and Mn, which showed strikingly positive correlation with content of physical clay< 0.01mm in soils. In the third group, there were Hg and Cd, which had nothing to do with soil texture. Therefore, in order to study background value for the region where the parent material is the same or where the parent material is the recent alluvium and sediment, attention must be drawn to the fact that type of soil texture has effects on the background level of some elements in soil, and it would be much significant to have the background levels of soil types with different texture.