西藏拉鲁湿地土壤重金属污染状况评估

Assessment of Soil Heavy Metals Pollution in Lalu Wetland,Tibet

对西藏拉鲁湿地自然保护区进行了实地考察与调研,并利用土壤重金属分析仪对不同区域土壤进行多点实验室检测。结果表明,土壤中含包括铁、锰、锌、砷等在内的25种重金属元素,其中,退化区域及季节淹水区域土壤重金属含量相对较高,在未退化区域及长期淹水、植被生长良好的区域土壤重金属含量相对较低。拉鲁湿地植物对重金属元素的吸收、转运和积累能在一定程度上降低了土壤的重金属污染,发挥了湿地降解污染物的重要功能。总体而言,西藏拉鲁湿地土壤重金属含量基本都处于自然背景值范围内,土壤质量仍属于一级质量水平。

In order to quantitatively assess the soil heavy metals pollution of Lalu Wetland in Tibet,field transect survey and soil heavy metal analyzer were used to conduct multi-point observation in different areas of Lalu Wetland Nature Reserve.The results showed that 25 kinds of heavy metals including iron,manganese,zinc and arsenic were detected in the soil of Lalu Wetland.Among them,the content of heavy metals in degraded area and seasonal flooded area was relatively high,while the content of heavy metals in non-degraded area and long-term flooded area with good vegetation growth was relatively low.The absorption,transport and accumulation of heavy metals by plants in Lalu Wetland can reduce the heavy metal pollution of soil to a certain extent,and play an important role in the degradation of pollutants.In general,the content of heavy metals in the soil of Lalu Wetland in Tibet is basically in the range of natural background values,and the soil quality is still in the first level.