上海土壤的Cu Zn Mn Co As Fe Mo和总稀土元素背景值及影响因素

SOIL BACKGROUND VALUES AND INFLUENTIAL FACTORS OF Cu Mn Co As Fe Mo AND TOTAL RARE-EARTH ELEMENTS IN SHANGHAI AREA

在上海市布点214个,按自然发生层采集1.0m深土壤剖面样品,调查了全市土壤Cu、Zn、Mn、Co、As、Fe、Mo和总稀土元素。提出了全市的背景值(Zn 83.81、Cu 27.79、Mn 555.48、Co12.66、As8.71、Mo 0.58、总稀土228.6 mg/kg、Fe3.02％),四种母质发育的土壤。Cu、Mn含量以湖积类型最低。Mn与pH值、有机质含量中度相关;Zn随土壤中含Ca量增加而明显减少;Zn、Co、As含量随土壤粒径变细而增加。潮坪的Cu、Mn、Co、As含量最高;Mn自内陆向沿海增加;含Zn量,湖沼平原>滨海平原>潮坪>三角洲平原。

214 testing spots were arranged in Shanhai suburbs and soil section samples of 1 m deep layer were collected according to natural generating layer. Cu, Zn, Mn, Co, As, Fe, Mo and the total rare-earth elements were studied and the soil background values of Shanghai and each county were provided (Zn 83.81, Cu 27. 79, Mn 555. 48, Co 12. 66, As 8. 71, Mo 0. 58, Fe 3. 02% and total rare-earth elements 228.6 mg/kg). The Cu content and Mn content were lowest in limnic deposition within 4 parent material developing soils. There was a median correlationship among content of Mn, organic material and PH value. The content of Zn reduced significantly with the increment of Ca content in soil while the contents of Zn, Co, As increased with the thinning of soil granules. The contents of Cu, Mn, Co and As were highest in tidal land while the content of Mn increased from continent to coast. The content of Zn reduced gradually from limnetic plain, coastal plain to tidal land and was the lowest in delta.