本文以区域性土壤镉含量的调查和污灌区土壤镉污染的调查所取得的结果,探讨北京地区镉在几种典型土壤剖面中的分布和区域分布,并按作者拟定的分级标准编制了北京地区土壤镉含量分布图。

The feature of cadmium distribution in profiles of some natural soil in Beijing area were discussed in this paper. Under natural condition,the cadmium was accumulated in B layer of brunisoilc soil,However,it was not accumulated obviously in leached drab soil and typical drab soil,and it was not accumulated in ling drab soil. The content of cadmium in surface was always higher than that of the subsoil in fluvo-aguic soil.The content of cadmium was increased with soil texture grade increase in subsoil of fluvo-aquic soil. The map of cadmium distribution in soil in Beijing area was drawn. Rcgional differentiation of cadmium in natural soil was less. Little soil were pollutcd in vary degress at sewage water irrigation area.