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引用本文:吴东浩,贾更华,吴浩云.2007-2019年太湖藻型和草型湖区叶绿素a变化特征及影响因子.湖泊科学,2021,33(5):1364-1375. DOI:10.18307/2021.0506
Wu Donghao,Jia Genghua,Wu Haoyun.Chlorophyll-a concentration variation characteristics of the algae-dominant and macrophyte-dominant areas in Lake Taihu and its driving factors, 2007-2019*. J. Lake Sci.2021,33(5):1364-1375. DOI:10.18307/2021.0506
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2007-2019年太湖藻型和草型湖区叶绿素a变化特征及影响因子
吴东浩1, 贾更华2, 吴浩云2
1.太湖流域水文水资源监测中心, 无锡 214024;2.水利部太湖流域管理局, 上海 200434
摘要:
基于太湖31个站点的逐月监测数据,分析了2007-2019年太湖藻型湖区和草型湖区的叶绿素a变化特征,并分析研究不同环境因子对不同类型湖区叶绿素a的影响.结果表明,近年来太湖不同类型湖区的总磷浓度和叶绿素a浓度变化基本一致,均呈波动上升趋势.不同类型湖区的总磷浓度拐点均为2015年,叶绿素a浓度拐点均为2016年.最低月平均水温、前冬积温、年平均水温、年均风速与藻型湖区和草型湖区叶绿素a浓度均呈显著相关.沉水植物分布面积与草型湖区叶绿素a浓度之间呈显著相关.湖西区年内和年度降雨剧烈变化,湖西区年降雨量与不同类型湖区当年叶绿素a浓度的关系不明显,5日极端降雨量与不同类型湖区下年度叶绿素a浓度均呈显著正相关.太湖蓝藻水华强度在短期内可能仍会处于较高水平,迫切需要高度重视高温时段太湖蓝藻打捞处置工作,保障饮用水安全;同时,要进一步加强湖西区强降雨期间的非点源污染防控措施研究,推动入湖污染通量稳步降低,并探索东西山之间及东茭咀附近水域沉水植物生态修复技术,降低风浪扰动作用,尽快恢复相关重要水域的沉水植物.
关键词:  叶绿素a  水温  风速  降雨  沉水植物  水华  湖西区  太湖
DOI:10.18307/2021.0506
分类号:
基金项目:国家自然科学基金项目(41877544)和国家重点研发计划项目(2018YFC0407900)联合资助.
Chlorophyll-a concentration variation characteristics of the algae-dominant and macrophyte-dominant areas in Lake Taihu and its driving factors, 2007-2019*
Wu Donghao1, Jia Genghua2, Wu Haoyun2
1.Taihu Basin Monitoring Center of Hydrology and Water Resources, Wuxi 214024, P. R. China;2.Taihu Basin Authority of Ministry of Water Resources, Shanghai 200434, P. R. China
Abstract:
Based on monthly monitoring data of 31 sites in Lake Taihu from 2007 to 2019, the different environmental factors that influence the chlorophyll-a (Chl.a) concentration in the algae-dominant region (ADR) and macrophyte-dominant region (MDR) were analyzed. Both the total phosphorus (TP) and Chl.a concentrations in the ADR and MDR showed a fluctuated increasing tendency. The turning points of TP and Chl.a concentrations for the ADR and MDL were 2015 and 2016, separately. The Chl.a concentrations in the ADR and MDR had significant relationships with the lowest mean monthly water temperature, accumulated temperature before winter, mean annual water temperature, as well as mean annual wind speed. The Chl.a concentration in the MDR had significant relationships with the submerged plant coverage. Notable changes occurred in the intra-and inter-annual precipitation in the Huxi sub-region of the Taihu Basin. The relationships between the annual precipitation and the Chl.a concentration in the ADR and MDR were not significant, however, the five days extreme precipitation had strong significant positive relationships with the next year's Chl.a concentration in ADR and MDR. The cyanobacterial bloom intensity will keep the high level in recent years, which demands urgently for cyanobacteria salvage and disposal during the high-temperature period to guarantee drinking water security. Research on the non-point source pollution prevention and control measures should be strengthened in the heavy precipitation period for the Huxi sub-region of the Taihu Basin, to decrease pollutant fluxes of the rivers into Lake Taihu. The restoration measures for reducing wind-wave disturbance in the Dongshan, Xishan, and Dongjiaozui water area should be promoted as soon as possible to recover the submerged plant in these areas.
Key words:  Chlorophyll-a  water temperature  wind speed  precipitation  submerged plant  algal bloom  Huxi sub-region of the Taihu Basin  Lake Taihu
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