北方高盐景观水体表层沉积物氮形态及影响因素  

NITROGEN FORMS AND THEIR INFLUENCE FACTORS IN SURFACE SEDIMENTS OF URBAN LANDSCAPE WATER WITH HIGH SALINITY IN NORTHERN CHINA

作　　者：丁飞杨 王晓昌[1] 王楠[1] 刘红磊[2] 熊家晴[1] 刘言正[1] 邵晓龙[2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055 [2]天津市环境保护科学研究院,天津300191

出　　处：《环境工程》2017年第12期63-67,共5页Environmental Engineering

基　　金：国家水体污染与控制科技重大专项(2013ZX07310-001)

摘　　要：为了解北方高盐景观水体沉积物中不同形态氮的分布特征及影响因素,以天津清净湖为研究对象,采用逐级分离浸取法对其表层沉积物中各形态氮进行监测。结果表明:1)表层沉积物中ω(TN)为698.1~1 450.0 mg/kg,平均值为1 214.5 mg/kg,属于中度污染水平,可转化态氮(TTN)为TN主要赋存形态,占TN的比例为61.2%~83.1%,潜在释放风险较大;2)沉积物中各形态TTN含量大小顺序为:ω(SOEF-N)>ω(SAEF-N)>ω(IEF-N)>ω(WAEF-N);3)相关性分析表明:TN与SOEF-N、TTN与SAEF-N之间呈显著相关,具有相同的生物地球化学行为;沉积物电导率(EC)与TN、TTN、含水率及LOI均显著相关,说明高盐景观水体表层沉积物氮形态与盐度有关。To study the distribution characteristics and influence factors of different forms of nitrogen in the surface sediment of urban landscape water,a case study of Qingjing Lake in Tianjin was selected. The concentrations of nitrogen forms of surface sediment were determined by the sequential extraction technique. The results showed that： 1） The concentration of TN was in the range of 698. 1 ~ 1 450. 0 mg/kg,with mean value of 1 214. 5 mg/kg. The level of nitrogen pollution in the surface sediments of Qingjing Lake was lower,belonging to the moderate pollution level. Meanwhile,the transferable total nitrogen（ TTN） was the main chemical speciation of TN,accounting for 61. 2% ~ 83. 1%,which indicated the potential releasing risk of nitrogen was high. 2） The decreasing order of the content of different forms of TTN was as follows： ω（ SOEF-N） ω（ SAEF-N） ω（ IEF-N） ω（ WAEF-N）. 3） Correlation analysis showed that there was a significant correlation between TN and SOEF-N,as well as TTN and SAEF-N,which indicated that they had same biogeochemical behavior. In addition,conductivity（ EC） was significantly correlated with TN,TTN,moisture and LOI,indicating that the surface sediments of urban landscape water in saline areas were related to salt content.

关 键 词：高盐 景观水体 沉积物 氮形态 清净湖 

分 类 号：X52[环境科学与工程—环境工程]