黄河三角洲表层土壤重金属元素的空间分布及其影响因素
SPATIAL DISTRIBUTION OF HEAVY METALS IN THE SURFACE SOIL OF YELLOW RIVER DELTA AND INFLUENCE FACTORS
-
摘要: 主要针对黄河三角洲表层土壤及沉积物的重金属分布调查,2006-2008年间采集表层土壤样品219个(其中浅海湿地25个),运用先进的现代分析测试手段进行测试,得到黄河三角洲表层土壤中重金属元素的富集程度为:Cr > Pb > Zn > As > Cu > Cd > Hg,浅海湿地中近海表层沉积物中重金属元素的富集程度较低,并根据研究区重金属的分布,将三角洲划为三个区域,北部油气开采影响区,中部黄河河流影响区,南部农业活动和生活污水排放联合影响区,黄河三角洲表层土壤中虽然具有较高的有机质,但是其对上三角洲平原表层土壤中重金属元素仅具有中等以下的富集作用,而对浅海湿地近海沉积物中的重金属具有中等以上的富集作用。Abstract: This research focuses on the distribution pattern of heavy metals in the surface soil and sediment of the Yellow River Delta. 219 samples were collected, including 25 samples from the shallow coastal wetland in 2006-2008. Modern techniques have been used to detect the contents of heavy metals. The abundance of heavy metals appears in an order of Cr > Pb > Zn > As > Cu > Cd > Hg in the region. The accumulation ratio of heavy metals is low in shallow coast wetland. The Delta as a whole could be divided into three regions in accordance with the distribution pattern of heavy metals. It shows that the northern part of the delta is mainly effected by oil and gas exploration and production, the middle part of the delta affected by the River itself and the south part effected by agriculture and discharge of sewages. Even though the soil of the Delta is rich in organic matter, the heavy metal contamination remains on medium level or even lower in the upper deltaic plain, while pollution of heavy metals is higher in the shallow coast wetland.