辽河三角洲湿地重金属在土壤及植被中的分布特征

对辽河三角洲湿地土壤和植被中重金属的分布特征进行调查分析。结果表明,Cd的垂直分布规律为先降低后升高,且40~60cm土层含量最高;Cr的垂直分布表现出先升高后降低的趋势,且40~60cm土层最低;Pb的垂直分布表现出由表层向底部逐渐降低的趋势;Zn的垂直分布与Cr相似,也表现出由表层至底部先升高后降低的变化趋势;Cu无明显的垂直分布规律。在土壤重金属水平分布上,由沿海向内陆,表层土壤重金属逐渐增加,且靠近双台子河的芦苇湿地表层土壤重金属含量相对较高。翅碱蓬（Suaeda heteroptera）吸收和累积重金属的能力要高于芦苇（Phragmites communis）,但芦苇对重金属的累积量与土壤中重金属含量并不存在明显的正相关关系,且芦苇叶中吸收和累积重金属的量要高于茎。

Characteristics of Heavy Metals in Soil and Vegetations of Liaohe Delta Wetlands

The distribution characteristics of heavy metals in soil and vegetations of Liaohe Delta wetlands were analyzed.The results showed that Cd content had the vertical distribution trend of increasing first and then decreasing with soil depth.The content in 40-60 cm soil depth were maximal.Cr and Zn contents had the trend of decreasing first and the increasing.The heavy metal Pb content were decreasing with the increasing soil depth,and Cu content had no obvious rules.The analysis of heavy metals on spatial distribution showed that the heavy metals in surface soil were increased from the coastal to the island.And the heavy metals of the surface soil near to Shuangtaizi River were also high.The results also showed that the accumulation amount of heavy metals in the Suaeda Heteroptera were higher than those in the reed.And the accumulation amounts of heavy metals were negatively correlated with heavy metals in soil(P>0.10).Meanwhile,the accumulated heavy metals in reed leaves were higher than those in the stems.