龟石水库夏季富营养化状况与蓝藻水华暴发特征

发布时间：2018-04-05 20:50

  本文选题：龟石水库　切入点：蓝藻水华　出处：《环境科学》2017年10期

【摘要】：龟石水库是贺州市主要的饮用水源,2014年夏季第一次暴发大规模的蓝藻水华.本研究通过分析水体的富营养化时空变化规律、外源污染来源以及浮游藻类群落结构动态变化特征,进而评价水体的富营养化状况,并提出合理的防控措施.结果表明,水库的氮磷浓度逐年升高,TN含量已远超过地表水Ⅱ类标准,部分样点的TP含量也超过Ⅱ类标准,且主要来源为规模化养殖和农业面源污染.水华期间浮游藻类细胞密度变化范围为8.60×10~6~5.36×10~8cells·L~(-1),水华优势种为惠氏微囊藻,密度最高达到5.36×10~8cells·L~(-1)以上,叶绿素a浓度最高为74.48μg·L~(-1),惠氏微囊藻细胞密度随时间推移呈现逐渐降低的趋势,并且垂直方向集中分布在表层及水下2 m处.水华期间浮游藻类总细胞密度与TN、TP、NO_3~--N和高锰酸盐指数呈现显著正相关,与透明度呈显著负相关.微囊藻毒素监测结果表明龟石水库水质未受到微囊藻毒素的污染.综合分析,对于中营养水平的龟石水库而言,蓝藻水华的防控既要关注气候和气象条件,更要尽量削减氮、磷营养盐入库量,维持较低营养盐水平是防范蓝藻水华的关键.
[Abstract]:Guishi Reservoir is the main drinking water source in Hezhou City. Shui Hua, a large scale cyanobacteria, broke out for the first time in summer 2014.By analyzing the temporal and spatial changes of eutrophication, the source of exogenous pollution and the dynamic characteristics of phytoplankton community structure, the eutrophication status of water body was evaluated, and the reasonable control measures were put forward.The results showed that the nitrogen and phosphorus concentration of the reservoir increased year by year, the TN content of the reservoir was far higher than that of the surface water class 鈪，

本文编号：1716406