共查询到19条相似文献,搜索用时 46 毫秒
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以横水水库为研究对象,分析其2016—2021年期间的水质状况,利用相关性和主成分分析揭示污染的根源和影响因子,根据其浮游植物功能群特征,对横水水库的水生态状况进行分析评价。结果显示:(1)水库的主要环境影响因子为氨氮、硫酸盐和硝酸盐氮,主要是由于受到稀土矿浸矿剂的影响;(2)相比于2016年,2021年横水水库的浮游植物种类和生物量增加,浮游植物群落结构发生变化,优势度降低。研究表明,氨氮为横水水库最主要的污染物,稀土矿开采是其水质污染的主要原因之一;目前横水水库的营养状态仍为中营养,但是其水质状况有向好趋势,建议进一步加强流域地表水的定期监测。 相似文献
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为了解鄱阳湖碟形湖浮游植物结构特征与水质健康状况,于2021年3月对鄱阳湖8个碟形湖采集水样,分析鄱阳湖的水质和浮游植物群落结构,并对浮游植物进行功能群划分。研究区域内共检出6门35种浮游植物,优势种为鱼腥藻(Anabaena spp.)和栅藻(Scenedesmus spp.)。研究区浮游植物可划分为17个功能群,其中A、D、J、MP、N、P、X1、X2和X3功能群出现频率较高,MP为优势功能群。Pearson相关性分析结果显示,ORP、TDS、pH值、DO和NO3-N是影响鄱阳湖碟形湖浮游植物群落结构的关键环境因子。基于传统综合营养状态指数法得出,各碟形湖TLI(∑)介于3~39.8之间,平均值为17,说明碟形湖水质整体为贫营养状态;基于浮游植物功能群计算Q指数得出,各碟形湖生态指数值介于1.24~4.44之间,平均值为3.79,说明鄱阳湖碟形湖水生态状况整体处于“好”状态。 相似文献
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胡陈港水库水质咸化原因分析及治理对策 总被引:7,自引:0,他引:7
宁海县胡陈港水库自建库以来,水质长期偏咸,不适合作饮用水及工业用水,水资源利用率极低,通过对库水污染原因的调查分析,提出相应的治理措施,可望在短期内明显改善水质,并有效提高水资源利用率。 相似文献
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海河蓝藻暴发期间浮游植物群落结构分析 总被引:3,自引:0,他引:3
针对海河蓝藻暴发,对其环境状况及水体浮游植物群落结构,以及藻类暴发的原因进行了分析。海河浮游植物共发现5门42种,其中蓝藻门和绿藻门种类较多,是构成海河浮游植物种类的主要组成类群;浮游植物细胞密度为1.89×108个/L,而蓝藻门细胞密度为1.72×108个/L,是海河浮游植物的优势类群;海河浮游植物生物量较大,多样性状况较差,水体污染类型为中污染。海河藻类暴发的原因为:夏季高温及光照强烈,雨水冲刷污染物注入,水草植物体腐烂,海河底质高营养盐浓度释放影响,入河水量少且流动性差,人为因素对海河水生态环境的破坏等。 相似文献
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为研究典型湖泊浮游植物群落结构及其与环境因子的关系,选取江西省鄱阳县自然湖泊道汊湖、城市景观湖东湖、养殖湖上土湖为研究对象,于2018-2021年每年的春季(5月)、秋季(10月)进行采样。样品分析共鉴定出浮游植物8门73种,浮游植物优势门类均为绿藻门和硅藻门,其次为蓝藻门。道汊湖的主要优势种有色球藻、微囊藻、平裂藻、鱼腥藻、长孢藻;东湖的主要优势种有衣藻、十字藻、盘星藻、色球藻、微囊藻、长孢藻;上土湖的主要优势种有微囊藻、平裂藻、鱼腥藻、长孢藻。研究期间,三个湖泊浮游植物群落结构在不同年份不同季节有显著差异,其变化主要是浮游植物优势种属间再分配。影响道汊湖浮游植物群落结构变化的主要环境因子是温度(WT)、透明度(SD)、溶解氧(DO)、高锰酸盐指数(CODMn);影响东湖浮游植物群落结构变化的主要环境因子是SD、TN、TP、CODMn;影响上土湖浮游植物群落结构变化的主要环境因子是WT、SD、光照强度、DO、叶绿素a(Chla)。 相似文献
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通过调查2021年锦州市锦凌水库的水生态及水质理化指标,采用典范对应法、综合营养状态指数法(TLI)、水质生物学法和熵权综合指数法(EHCI),研究分析优势属、群落特征、环境因子影响、水库水质以及水生态健康状态。结果表明:锦凌水库浮游植物共7门48属,生物量和浮游植物丰度处于0.80~38.12mg/L、(4.5~104)×106cell/L范围;春、夏、冬季优势种属以硅藻门、绿藻门和硅藻-蓝藻门为主;锦凌水库浮游植物群落变化受TN、SD、DO、CODMn、叶绿素a因子的影响较大;月尺度上,多样性和均匀度指数2.57、0.64,总体呈β-中污型和清洁-寡污型水质,TLI指数45.1达到中营养等级,EHCI指数0.4 078达到中等健康水平;EHCI与TLI指数存在显著负相关性,但是EHCI指数能够更好地反映水生态健康综合性与整体性,可以为锦凌水库的科学管理提供参考依据。 相似文献
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分析飞来峡水库水生态现状,针对飞来峡水生态退化和破坏的原因,结合飞来峡水库以往水生态修复工作经验,对河道型水库水生态修复进行探讨。 相似文献
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水库除险加固扩容工程,水位从死水位恢复至正常运行水位的过程,入库和出库流量调节机制发生急剧变化,水库的水文和水动力状态改变明显。该文以周年为时间尺度,以广东省梅州市一亚热带中型水库为例,探讨水库蓄水过程中的相关水文、水环境、水生态变化过程,对蓄水过程中可能出现的影响饮用水水质安全的因素进行分析,并提出类似情况下中小型水库水资源管理建议。 相似文献
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调水对巢湖市河道水质的改善效果及对浮游藻类的影响 总被引:1,自引:0,他引:1
以巢湖市封闭河道为研究对象,采用水动力模型和生态动力学模型方法,结合野外围隔试验,探讨了调水对河道水质改善和水华抑制的作用效果,并通过调水试验对模拟结果进行了验证。计算出最优的调水周期,提出了合理的涵闸工程改造与科学的引排结合的措施。结果表明:调水能够使河道的水动力条件得到显著提高,平均流速均大于0.10 m/s,高于浮游植物生长临界流速,换水频率在21 d以内。通过一次调水试验表明模型的计算结果比较合理,科学合理的调水能达到抑制有害蓝藻水华在夏季暴发的目的。 相似文献
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Ali Fadel Bruno J. Lemaire Ali Atoui Brigitte Vinçon‐Leite Nabil Amacha Kamal Slim Bruno Tassin 《Lakes & Reservoirs: Research and Management》2014,19(2):142-157
Many reservoirs have been constructed throughout the world during the 20th century, with many also suffering from eutrophication. The resulting increased phytoplankton biomass in reservoirs impairs their use. Except for Lake Kinneret, the environmental status of lakes and reservoirs in the Middle East is poorly documented. Karaoun reservoir, also known as Qaroun, Qaraoun or Qarun, is the largest water body in Lebanon, having been constructed for irrigation and hydropower production. This present study reviews Karaoun reservoir, including its characteristics, uses, water quality and phytoplankton succession, to assess the environmental status of the reservoir on the basis of the few existing previous publications about the reservoir. Since 2004, which is 39 years after its construction, the reservoir is considered to be hypereutrophic, with low phytoplankton biodiversity and regular blooms of toxic cyanobacteria. The nutrient and trace metal concentrations would not prevent use of the reservoir for a drinking water supply for Beirut, as is currently being planned, although not all the micropollutants in the lake were documented. Karaoun reservoir is compared to other monitored lakes and reservoirs around the Mediterranean Sea. They share annual toxic cyanobacteria blooms of Aphanizomenon ovalisporum and of Microcystis aeruginosa. The phytoplankton composition and succession of Karaoun reservoir is more similar to El Gergal reservoir (Spain) than nearby natural lakes such as Lake Kinneret (Israel) and Lake Trichonis (Greece). Phytoplankton diversity in Karaoun reservoir was the lowest, due to higher nutrient concentrations and a larger decrease in water level in the dry season. Karaoun reservoir represents an interesting example of the potential response of the phytoplankton community in other lakes and reservoirs during the drought periods expected to occur as a result of global climate change. 相似文献
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Norbert Kemka Thomas Njiné Serge Hubert Zébazé Togouet Samuel Foto Menbohan Moïse Nola Adolphe Monkiedje Domitille Niyitegeka Pierre Compère 《Lakes & Reservoirs: Research and Management》2006,11(1):47-55
A 1 year qualitative and quantitative evaluation of phytoplankton and chlorophyll‐a, as well as some physicochemical parameters, was recorded in a shallow tropical lake in Cameroon: the Yaounde Municipal Lake. Physicochemical measurements also were regularly made in its main tributary (Mingoa Stream). These analyses aimed to assess the lake's trophic status and to propose measures for controlling its degradation process. The Secchi disk transparency was low and rarely exceeded 100 cm. Conductivity was higher near the lake bottom. The oxygen deficiency, and sometimes anoxia, recorded from a 2.5 m depth leads to high quantities of ammonium‐nitrogen. The total phosphorus concentrations varied from 80–2290 µg P L?1 and the total Kjeldhal nitrogen concentrations fluctuated between 3 and 15 mg L?1. Upstream to the lake, in the Mingoa Stream, total phosphorus concentrations ranged from 0.6–3.8 mg P L?1 and total Kjeldhal nitrogen concentrations ranged from 10–22 mg L?1. There are up to 102 phytoplankton‐specific taxa, with Euglenophyta and Chlorophyta particularly more diversified. The phytoplankton biomass and chlorophyll‐a concentrations reached 225 µg mL?1 and 566 mg m?3, respectively. The analyses pointed out the allogenic nature of the functioning of this ecosystem as a result of bad waste management in the surrounding landscape. Urgent actions need to be undertaken in order to rehabilitate this lake, which rapidly shifted to a hypertrophic status. 相似文献
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An assessment of the pollution status of Museum Lake in the Thiruvananthapuram Botanical Garden and Museum was conducted. Analysis of different community structures of the planktonic taxa in the lake revealed it is organically polluted, attributable to the organic litter from riparian vegetation. A total of 30 most pollution‐tolerant phytoplankton genera and 24 pollution‐tolerant species were identified. Pollution‐tolerant phytoplankton genera in the lake included Chlorophyceae, Bacillariophyceae, Cyanophyceae and Euglenophyceae. Scenedesmus, Pinnularia, Euglena, Ankistrodesmus, Closterium, Crucigenia, Kirchneriella, Merismopedia and Oscillatoria were some of the phytoplankton pollution tolerant genera whereas, Nitzschia palea, Synedra acus, Scenedesmus quadricauda, Pandorina morum and Trachelomonas volvocina were some of the pollution tolerant species noted. Excessive nutrient loading from the surrounding area is definitely degrading the quality of this urban lake ecosystem. Detailed information regarding the pollution status of a waterbody is very important in this regard, noting it ultimately assists in undertaking proper management of a waterbody. The Palmer Algal Index score for Museum Lake was 37, indicating it is highly organic enriched. The results of different algal indices (e.g. Chlorophycean Index; Nygaard Index) indicated a eutrophic condition for Museum Lake, being attributed to its increased organic enrichment. Canonical correspondence analysis between environmental variables and the microalgal bioindicators also highlighted the influence of the physical and chemical parameters on phytoplankton abundance and distribution in Museum Lake. 相似文献
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洪泽湖浮游藻类变化动态及影响因素 总被引:2,自引:0,他引:2
针对2011年7月至2013年10月在洪泽湖11个采样点20次采样获得的湖水表层浮游藻类和水质理化指标数据,采用Shannon-Wiener指数H和优势度指数Y进行数据统计处理,分析洪泽湖浮游藻类时空分布动态及其影响要素。结果表明:洪泽湖浮游藻类共有7门60属144种,主要包括绿藻门66种、硅藻门36种、蓝藻门23种、裸藻门13种。浮游藻类群落具有明显的时空异质性,物种丰富度夏季最高,秋季中等,冬春季最低;西北部(成子湖区)和河流入湖口(溧河洼)高,湖心和河流出湖口(蒋坝)低;浮游藻类细胞密度全湖平均值变幅为157万~604万个/L,夏秋高,冬春--低;成子湖区等静水区高,入湖和出湖口低。浮游藻类组成和细胞密度的时间动态与温度、水位及营养盐(TN、TP等)的季节差异有关,而其空间动态与水动力因素和营养盐(NH3-N)的空间差异有关。建议限制洪泽湖营养盐陆地输入,合理调控洪泽湖水动力,以遏制洪泽湖蓝藻水华的发生。 相似文献
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Carolina Fernández Elisa R. Parodi Eduardo J. Cáceres 《Lakes & Reservoirs: Research and Management》2009,14(1):85-101
The current trophic status of Paso de las Piedras Reservoir was evaluated by analysing different physicochemical, biological and environmental variables, in relation to its water quality, and application of two different classification criteria. Water quality sampling was conducted at four sampling sites from June 2004 to June 2005. During this study, 183 phytoplankton taxa were identified. The phytoplankton abundance exhibited a maximum of 368.037 × 103 cells.mL?1 in February 2005, and at least 1.133 × 103 cells.mL?1 in October 2004. An almost exclusive dominance of Cyanobacteria was observed between December 2004 and May 2005, the product of a large relative abundance of Anabaena circinalis and Microcystis natans which, together with other companions, were the reason for an algal bloom characterized by an average density of 133.05 × 103 cells.mL?1, and an average chlorophyll concentration of 28.7 mg.m?3. These study results indicate that the seasonal variations of physical, chemical and biological parameters in the waters of this reservoir were essentially a consequence of environmental and hydrological conditions in the dam area. In contrast, the spatial variations inside the lake were the result of the characteristics of the water inflow provided by its two main tributaries. The N:P ratio suggests neither nutrient is a limiting factor for maximum algal biomass in the lake, indicating that variations in the phytoplankton community structure, and development of phytoplankton blooms, would be more constrained by environmental and hydrological conditions than nutrient competition. The high concentration of measured nutrients could be attributed to the concurrence of various non‐point sources. The phytoplankton species richness was high, exhibiting values even higher than those mentioned in previous studies. Considering the two trophic classification systems, and based on total phosphorus data, the reservoir is classified within the hypertrophic category. In contrast, considering only the chlorophyll and turbidity data, the lake would be classified within the eutrophic category. 相似文献