北固山湿地土壤氮磷及重金属空间分布

通过研究北固山湿地四个典型区域土壤中全氮、全磷及重金属元素空间分布规律,探讨湿地土壤中全氮、全磷及重金属元素的空间分布与周围环境之间的关系。结果显示,湿地虉草区各层的全氮、全磷含量均高于芦苇区;大东沟排放口表层土壤全氮、全磷含量明显高于其他区域,是水体富营养化的重点控制区;湿地土壤中的重金属污染物主要分布在0～15cm,且虉草区的有效Mn、Zn、Fe含量普遍高于芦苇区。研究结果表明,植被对调整湿地氮、磷及重金属的空间分布有一定作用,可以选择适宜的植物对湿地进行生态修复。研究为湿地生态修复和生态清淤提供理论依据。

Spatial Distribution of Nitrogen, Phosphorus and Heavy Metal in Wetland Soil

Relationship of spatial distribution of TN, TP and heavy metals in wetland soil and surrounding environment was discussed through analysis of spatial distribution of TN, TP and heavy metals in soil of 4 typical areas of Beigushan wetland. Results indicated that TN and TP contents in each layer of Phalaris arundinacea area were higher than those in Phragmites communis area. TN and TP contents in surface soil of Dadonggou wastewater outfall which were remarkably higher than those in Other area was the key area for eutrophication control. Heavy metals were mainly concentrated in soil layers of 0- 15cm, with content of available Mn, Zn and Fe in Phalaris arundinacea area higher than those in Phragmites communis area. Results showed that vegetation was helpful to adjust the spatial distribution of nitrogen, phosphorus and heavy metals in wetland. It was feasible to carry out ecological recovery by suitable vegetation, which will provide theoretical basis for ecological recovery and purging silt of wetland.