摘要
底泥营养盐释放对淀山湖湖区造成的内源污染不容忽视。采用室外采样和室内模拟实验方法,对春夏两季淀山湖沉积物-水界面氮磷释放速率进行了研究。结果表明春季氨氮、硝态氮、可溶磷的的通量变化范围分别为-692.79~315.82 mg/(m^2*h)、-19.04~5.29 mg/(m^2*h)和-1.35~2.31 mg/(m^2*h),平均值分别为76.65 mg/(m^2*h)、-3.29 mg/(m^2*h)和0.64 mg/(m^2*h)。夏季三者变化范围分别为-74.15~91.91 mg/(m^2*h)、-70.71 mg/(m^2*h)~8.65 mg/(m^2*h)和-10.02~18.86 mg/(m^2*h),平均值为4.85mg/(m^2*h)、-42.16 mg/(m^2*h)和9.47 mg/(m^2*h)。淀山湖区春夏两季总氮(TN)、总磷(TP)的交换总量分别为-1 769.22 t,1 539.40 t,淀山湖底泥可以有效去除上覆水体氮负荷,但却是水体磷的释放源。
The endogenous pollution caused by the release of nutrient in Dianshan Lake cannot be ignored.This research,performed in Dianshan Lake,aimed to estimate the benthic flux of Nitrogen and Phosphorus during spring and summer with the method of outdoor sampling and indoor simulation experiments.Results showed that benthic flux of ammonia nitrogen,nitrate nitrogen and PO_4^（3-）-Pvaried from -692.79 to 315.82 mg/（m^2＊h）（with mean value of 76.65 mg/（m^2＊h））,-19.04 to 5.29 mg/（m^2＊h）（with mean value of -3.29 mg/（m^2＊h）） and-1.35 to 2.31 mg/（m^2＊h）（with mean value of 0.64 mg/（m^2＊h）） in spring.While benthic flux of ammonia nitrogen,nitrate nitrogen and PO_4^（3-）-Pvaried from -74.15 to 91.91 mg/（m^2＊h）（with mean value of 4.85 mg/（m^2＊h））,-70.71 to 8.65 mg/（m^2＊h）（with mean value of-42.16 mg/（m^2＊h）） and -10.02 to 18.86 mg/（m^2＊h）（with mean value of 9.47 mg/（m^2＊h））.After interpolation,it can be calculated that the total exchange rate of total nitrogen（TN） and total phosphorus（TP） across sediment water interface are -1 769.22 t and 1 539.40 t during spring and summer in Dianshan Lake.The research showed that sediment can effectively cut down nitrogen loading rate of overlaying water but also be the releasing source of phosphate in Disnshan Lake.
出处
《环境科学与管理》
CAS
2017年第10期145-150,共6页
Environmental Science and Management
基金
国家自然科学基金(No.41671467,No.41473094)
国家自然科学基金人才培养项目(No.J1310028)联合资助
科技基础性工作专项(No.2014FY210600)
上海市青浦区环保局招标项目(No.SHXM-00-20160920-1641116331401)
关键词
淀山湖
沉积物-水界面
氮
磷
交换通量
Dianshan Lake
sediment water interface
nitro-gen
phosphorus
flux
