上覆水环境因子对滨海水库沉积物氮磷释放的影响

发布时间：2018-03-06 06:38

  本文选题：扰动　切入点：ρ(Cl-)　出处：《环境科学研究》2016年12期 　论文类型：期刊论文

【摘要】：为了解我国滨海水库富营养化过程,以北大港水库沉积物为研究对象,通过室内模拟试验,考察上覆水环境因子〔扰动、ρ(Cl-)、pH、温度、ρ(DO)〕对滨海水库沉积物氮、磷释放的影响.结果表明:1扰动促进氮、磷的释放,ρ(NH_3-N)、ρ(NO_3~--N)、ρ(TN)和ρ(TP)增加了54.4%~230.8%,扰动对滨海水库沉积物TN、TP释放通量的促进作用比淡水沉积物强;2ρ(Cl-)升高促进氮、磷释放,ρ(Cl-)越高,促进效果越强,ρ(Cl-)为1 000和5 000 mg/L时,ρ(NH_3-N)、ρ(NO_3~--N)、ρ(TN)和ρ(TP)分别增加了4.2%、3.2%、35.0%、11.9%和8.4%、4.8%、44.7%、23.8%;3与pH为7.0时相比,pH为8.5和10.0时,ρ(TP)增加了21.3%~42.6%,ρ(NH_3-N)降低了14.9%~18.6%,ρ(NO_3~--N)和ρ(TN)基本没有变化,但NO_3~--N释放通量增加了5.2%~10.3%,TN的释放通量降低了7.1%~21.5%;4温度升高促进了NH_3-N、TN和TP释放,抑制了NO_3~--N释放,滨海水库沉积物中较高的盐度减弱了温度对TP释放的促进作用,25℃时,ρ(NH_3-N)、ρ(TN)和ρ(TP)比5℃时增加了37.3%~71.0%,ρ(NO_3~--N)降低了34.0%;5好氧条件抑制了NH_3-N、TN和TP释放,促进了NO_3~--N释放,好氧条件下ρ(NH_3-N)、ρ(TN)和ρ(TP)降低了54.2%~85.6%,ρ(NO_3~--N)增加了20.5%.研究显示,上覆水环境因子会影响滨海水库沉积物氮、磷释放,其中以扰动、温度和ρ(DO)影响较大.
[Abstract]:In order to understand the eutrophication process of coastal reservoir in China, the sediment of North Dagang Reservoir was used as an object of study. The effects of overlying water environmental factors (disturbance, 蟻 -Cl ~ (-) pH, pH, temperature, 蟻 ~ (DOA)) on nitrogen in sediment of Binhai Reservoir were investigated by laboratory simulation test. The results show that the effects of 1 disturbance on nitrogen release, phosphorus release, 蟻 ~ (NH _ 3-N), 蟻 ~ (no _ 3-N ~ +), 蟻 ~ (no _ 3 ~ + -N ~ +, 蟻 _ N _ N) and 蟻 ~ (TPTP) increase 54.4% ~ 230.8%. The effect of disturbance on TNT _ (TP) release flux of coastal reservoir sediment is stronger than that of fresh water sediment (2 蟻 Cl ~ (-)), and the increase of phosphorus release is higher than that of fresh water sediment (P ~ (2) -Cl ~ (-)), and the effect of disturbance on TNTP release is higher than that of fresh water sediment. The stronger the promotion effect is, the greater the promotion effect is, the more 4.2kg, 35.0I, 8.4U, 4.8b, 4.44.723.8i, when the pH is 8.54.723.883 compared with pH 7.0, when the pH is 8.5and 10.0, the 蟻 mg/L) increases 21.3cn 42.6. 蟻 (NH _ 3-N) decreases 14.918.6T, and the 蟻 -NH _ 3-N) decreases 14.918.6cm, and no change is found in the contents of NO3- (N) and 蟻 -TNT (10.0) compared with pH 7.0, 蟻 mg/L) has increased 21.3n (42.6N), and 蟻 (NH _ 3-N) has decreased 14.918.6cm, and there has been no change in the contents of NO3- and 蟻 -TNT. However, the release flux of NO_3~--N increased by 5.2% and 10.3%, and the flux of TN decreased by 7.1% and 21.55% respectively. The increase of temperature promoted the release of NH _ 3-NN _ N and TP, and inhibited the release of NO_3~--N. The higher salinity in the sediment of the coastal reservoir weakens the effect of temperature on TP release. At 25 鈩，

本文编号：1573724