摘要
通过采集阳宗海150组沉积物的样品,研究了沉积物中磷的空间分布特征及其影响因素,并分析了磷的来源与污染历史.结果表明：阳宗海沉积物中磷的含量介于318～3 931 mg/kg之间,0～2 cm、2～4 cm、4～6 cm、6～8 cm及8～10 cm层位沉积物中磷的平均含量依次为1 151 mg/kg、1 126 mg/kg、1 138 mg/kg、1 057 mg/kg、893 mg/kg;沉积物中磷的垂向分布特征表现为沉积物由上至下磷含量呈逐渐降低的态势,水平分布特征表现为南北两岸沉积物中磷含量相对较高,自湖岸向湖中心其逐渐降低;20世纪80年代以前,阳宗海沉积物中磷的分布主要受pH值、氧化还原电位、有机质等天然因素影响,20世纪80年代之后,沉积物中磷的分布主要受排污位置所控;阳宗海沉积物中磷的来源经历了由局部向多源发展,且由点源污染逐渐向面源转变的过程,目前水土流失及农业面源污染是阳宗海沉积物中磷的主要来源.
By collecting 150sediment samples from Yangzonghai Lake,this paper studies the spatial distribution of phosphorus and the major factors and analyzes the source of phosphorus and its pollution history.The results show that the total phosphorus content in the sediments of Yangzonghai Lake is 318~3 931mg/kg.In the sediments at the depths of 0~2cm,2~4cm,4~6cm,6~8cm and 8~10cm,the phosphorus contents are 1 151mg/kg,1 126mg/kg,1 138mg/kg,1 057mg/kg and 893mg/kg respectively.Phosphorus contents of sediments in the north and south sides are relatively high,gradually decreasing from the shore to the center of the lake.Before 1980s,the distribution of phosphorus in sediments had been mainly affected by natural factors such as pH,oxidation-reduction potential and organic matter.Since the 1980s,the distribution of phosphorus has been mainly controlled by the pollution discharge position.Sources of phosphorus in the sediments have changed from the local source to the multiple source,and from point source to surface source.Currently,soil erosion and agricultural non-point source pollution are the main sources of phosphorus in Yangzonghai Lake.
出处
《安全与环境工程》
CAS
北大核心
2013年第6期43-48,共6页
Safety and Environmental Engineering
基金
中国地质调查局项目(1212011220982)
关键词
沉积物
磷
分布特征
影响因素
阳宗海
sediment
phosphorus
distribution characteristic
influencing factor
Yangzonghai Lake
