长江三角洲表层土壤Sn元素的空间分布特征 及影响因素

对长江三角洲地区表层土壤Sn含量的空间分布特征进行分析,发现土壤平均含Sn量为8.35mg/kg,远远高于全国A层土壤Sn的背景值2.6mg/kg,表层土壤中Sn空间分布不均匀,呈现由苏锡常、宁镇扬、杭嘉湖、宁绍等经济带增高的趋势。各种沉积环境、土壤类型中Sn的含量也较全国类似或同类沉积环境、土壤类型中Sn的含量高,显示了高背景的特点。人类活动影响强烈区表层土壤中Sn元素富集明显,90.39%的面积区表现出富集的特征,富集系数大于2的强富集区面积占44.03%。另外,Ag、Bi、Hg、P、Pb、Sb、Se、TOC等也与土壤Sn呈相关性,可能与土壤Sn的富集有成因联系。

Spatial distribution of tin in top soils of Yangtze River delta and influencing factors

In this paper, concentrations of tin and related elements in top soils (0~20cm) of Yangtze River delta were analyzed, and the distribution of Sn in soils was studied. It is found that soil Sn concentration of Yangtze River delta was by far higher than that of its background value of China. The average Sn concentration in the studied soils is 8.35mg/kg. It is indicated that in large and medium-sized cities and some developed regions, the concentrations of tin are much higher than those of other areas. In the same sedimentary environment of agrotype, Sn content of the above areas is higher than that of the whole country, showing characteristics of high background. Researches show that the factors caused by human activities are much more important than other factors. The enrichment of tin in the surface soil is in a serious condition, and 90.39% area shows enrichment tendency, with the strong concentration area characterized by concentration coefficient large than 2 possessing 44.03%. In addition, Ag, Bi, Hg, P, Pb, Sb, Se, TOC and some other elements also have some influence on the distribution of Sn.