太湖湖滨带春季悬浮物沉降特征与水体营养盐响应

发布时间：2017-12-26 21:45

本文关键词：太湖湖滨带春季悬浮物沉降特征与水体营养盐响应?　出处：《环境科学》2017年01期 　论文类型：期刊论文

【摘要】：为研究湖滨带悬浮物沉降过程中水体营养盐时空分布状况,在太湖西岸湖滨带典型区域进行原位沉降实验,计算了沉降量和沉降通量,并对沉降过程中TP、TN、NH+4-N、NO-3-N测定分析.结果表明,太湖西岸湖滨带沉降通量表现为人工芦苇区近岸无植被区自然芦苇区远岸无植被区,平均沉降通量分别为(1 383.40±925.60)、(1 208.67±743.50)、(278.72±142.53)、(245.58±154.25)g·(m2·d)-1,沉降第6 d以后沉降量稳定上升,沉降速率大于分解速率;经过持续15 d野外沉降实验观测,沉降过程中近岸带的TP含量是远岸带的2~3倍,且沉积物捕获器内NH+4-N和NO-3-N含量出现显著的差异(P0.01);沉降量与水体TN和NH+4-N含量呈显著相关(P0.01,n=42),表明沉降量的增加会导致上覆水体TN与NH+4-N含量增加;TN与NH+4-N相关系数为0.84,显示沉降量的增加可能加速氮素不同形态间相互转化,这一现象在当前太湖湖泛治理中应当予以重视.
[Abstract]:With the suspension of the lakeside settlement process of water nutrient spatial distribution, with typical area on the west coast of Taihu Lake by in situ sedimentation experiment, settlement and settlement flux calculated, and the settlement process of TP, TN, NH+4-N and NO-3-N were analyzed. The results show that the west shore of Taihu lake is artificial coastal sedimentation flux reed zone no vegetation area without vegetation natural reed shore area, the average sedimentation fluxes were (1383.40 + 925.60), (1208.67 + 743.50), (278.72 + 142.53), (245.58 + 154.25) - G (M2 - D) -1, sixth d after the settlement settlement increase stability, settlement rate is greater than the decomposition after 15 consecutive rate; D settlement field experimental observation, the content of TP in the settlement process is 2~3 times as far as coastal zone, and the sediment content of NH+4-N and NO-3-N in capture there was significant difference (P0.01); and the settlement of TN and NH+4-N in water Significant correlation (P0.01, n=42), shows that with the increase of the settlement would lead to the increase of overlying water and TN content of NH+4-N; TN and NH+4-N correlation coefficient was 0.84, showed an increase in settlement may accelerate the mutual transformation between different forms of nitrogen, this phenomenon should be paid more attention in the current Taihu Lake governance.
【作者单位】：南京师范大学地理科学学院;南京师范大学环境学院;江苏省地理信息资源开发与利用协同创新中心江苏省环境演变与生态建设重点实验室江苏省水土环境生态修复工程实验室;
【基金】：国家自然科学基金项目(41173078) 国家水体污染控制与治理科技重大专项(2012ZX07101-008-02) 江苏省太湖水环境综合治理科研项目(JSZC-G2014-212)
【分类号】：X524
【正文快照】： 利用协同创新中心,江苏省环境演变与生态建设重点实验室,江苏省水土环境生态修复工程实验室,南京210023)湖泊底泥是湖泊生态系统的重要组成部分,在以沉降和沉积为主的情况下,它是湖泊营养盐及污染物的“汇”,吸纳湖水中的物质;在以再悬浮和释放为主的情况下,它是湖水营养盐及

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