大型通江湖泊藻类增殖驱动要素的时空分异特征  

SPATIOTEMPORAL VARIATION OF DRIVING FACTORS OF ALGAL PROLIFERATION IN A LARGE RIVER-CONNECTED LAKE

作　　者：袁伟皓 王华[1,2] 曾一川 方少文 王仕刚 李媛媛 张心悦 YUAN Wei-hao;WANG Hua;ZENG Yi-chuan;FANG Shao-wen;WANG Shi-gang;LI Yuan-yuan;ZHANG Xin-yue(College of Environment,Hohai University,Nanjing 210098,China;Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education,Hohai University,Nanjing 210098,China;Jiangxi Hydrological Bureau,Nanchang 330000,China;Foyang Lake Hydrological Bureau,Jiujiang 332800,China)

机构地区：[1]河海大学环境学院,南京210098 [2]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,南京210098 [3]江西省水文局,南昌330000 [4]鄱阳湖水文局,江西九江332800

出　　处：《环境工程》2021年第10期64-71,128,共9页Environmental Engineering

基　　金：国家自然科学基金面上项目(51779075);江西省水利科技项目(KT201623)。

摘　　要：以我国大型通江湖泊鄱阳湖为例,对2016-2018年鄱阳湖6个典型点位的叶绿素a、TN等10个指标进行测定。分析了鄱阳湖不同因子的时空分异特征,并运用综合营养状态指数法及主成分分析方法,结合水文水动力、泥沙和人为影响等因素,判断藻类增殖的驱动要素。结果显示:COD浓度南高北低,由西向东表现为高-低-高;TN变化趋势与NH_(3)-N相近,夏季呈现东部南部高、北部低的特点,而西部蚌湖至都昌处分布扩散;TP南高北低、东西部均较高;直链藻和微囊藻出现频次分别占51.11%和16.44%;蚌湖点位藻细胞密度与叶绿素a浓度均最高,分别为最小点位的7.8,5.3倍。研究期间鄱阳湖以轻度富营养为主;TP为6个点位藻类增殖的主要限制性因子,藻类增殖与TN关系较小;水温、溶解氧等也可能成为藻类增殖的要素。后期鄱阳湖藻类综合治理需从加强季节性监测与预警、重点识别和调控测点关键性因子和强化藻种监控等方面展开。Taking Poyang Lake,a large river-connected lake in China as an example,10 indicators,including Chl-a and TN,were measured at six typical points in Poyang Lake from 2016 to 2018.The spatio-temporal variation characteristics of different factors in Poyang Lake were analyzed,and the driving factors of algal proliferation were determined by integrated trophic state index method and principal component analysis,combined with the hydrology and hydrodynamics,sediment and anthropogenic influence of Poyang Lake.The results showed that:COD concentration was higher in the south and lower in the north,showed a high-low-high trend from the west to the east.The trend of TN concentration was similar to that of NH_(3)-N,showing higher in the south and the east,and lower in the north in summer,while the distribution spread from Banghu to Duchang in the west.TP concentration was higher in the south and lower in the north,and high in both the east and west.The occurrence frequency of Melosira and Microcystis was 51.11%and 16.44%,respectively.The density of algal cells and chl-a were the highest in Banghu,which were 7.8 and 5.3 times higher than those in Hukou,respectively.Poyang Lake was mainly at a light eutrophication level during the study period.TP was the main limiting factor for algal proliferation at six sites,which had little relationship with TN.Also,water temperature and dissolved oxygen may be factors for algal proliferation in Poyang Lake.In the future,the comprehensive management of algae in Poyang Lake should be carried out by strengthening seasonal monitoring and early warning,focusing on identifying and regulating key factors at measurement points,and strengthening algal species monitoring.

关 键 词：鄱阳湖 驱动要素 时空分异 藻类增殖 主成分分析 

分 类 号：X524[环境科学与工程—环境工程]