鄱阳湖沉积物有机磷形态及对水位变化响应  

Organic phosphorus forms in sediments and their relationship with the change of water level in Poyang Lake

作　　者：马双丽[1,2] 倪兆奎[2] 王圣瑞[2] 李晓秀[1] 倪栋 

机构地区：[1]首都师范大学资源环境与旅游学院,北京100048 [2]中国环境科学研究院环境基准与风险评估国家重点实验室湖泊生态创新基地国家环境保护湖泊污染控制实验室,北京100012 [3]公路交通环境保护技术交通行业重点实验室,北京100088

出　　处：《环境科学学报》2016年第10期3607-3614,共8页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.41173118);国家重点基础研究发展规划项目(No.2012CB417004)~~

摘　　要：选取鄱阳湖枯水期不同高程出露表层沉积物,通过研究有机磷含量及形态差异,试图揭示江湖关系变化引起的水位下降对鄱阳湖沉积物有机磷潜在释放风险的影响.结果表明：1鄱阳湖枯水期表层沉积物有机磷含量（115.2~448.3 mg·kg-1）占总磷的19.3%~45.1%,有机磷含量空间分布呈＂五河＂入湖尾闾区高于湖心区和北部湖区.2鄱阳湖表层沉积物各形态有机磷含量大小顺序为：残渣态有机磷〉盐酸提取有机磷〉胡敏酸有机磷〉碳酸氢钠提取有机磷〉富里酸有机磷.3水位下降引起的沉积物出露时间延长是引起鄱阳湖不同高程沉积物有机磷形态变化的重要原因.沉积物出露时间越长,碳酸氢钠提取有机磷、盐酸提取有机磷与富里酸有机磷的含量越低,而胡敏酸有机磷和残渣态有机磷含量越高.同时,水位下降引起的沉积物出露时间延长致使活性有机磷和中活性有机磷占总有机磷比例下降,而非活性有机磷占总有机磷比例增加,反映了沉积物出露时间延长可能会促进有机磷形态由活性向非活性转化,在一定程度上能够降低沉积物有机磷的潜在性风险.The content and forms of organic phosphorus（ OP） in Poyang Lake from different sediment in dry season were studied,to evaluate the role of water level change on potential release risk of OP in surface sediment. Results show that： 1The content of OP in surface sediment in dry season range between 115.2 to 448.3 mg·kg-1,accounting for 19.3% ~45.1% of TP.OP content of sediment in ＂ Five rivers＂ lake rump area was more than that in central and northern area.2The order of OP content with different forms was Res-Po 〉HCl-Po 〉Hum-Po 〉Na HCO3-Po〉 Ful-Po. 3 When the water level declined,the sediment exposed time prolonged,which was the most important reason for the change of OP＇s forms in the different evations sediments of Poyang Lake.With the increase of exposure time of sediment,the content of Na HCO3-Po,HCl-Poand Ful-Podecreased,while Hum-Poand Res-Po content increased.Meanwhile,the prolonged sediment exposure time caused by the declining of water level resulted in the proportion of Lab-Poand ModPo＇s content decreased,while the proportion of Non-Po＇ s content increased,which reflected the prolonging sediments exposure time may promote OP morphology from active to inactive transformation,to a certain extent can reduce sediment OP＇s potential risk.

关 键 词：鄱阳湖 沉积物 有机磷形态 水位变化 

分 类 号：X524[环境科学与工程—环境工程] X17