浅层高富营养化水库两个中游环境实验中周围植物对富集和营养稀释的响应

IF 1.2 4区 环境科学与生态学 Q4 LIMNOLOGY Limnetica Pub Date : 2022-01-01 DOI:10.23818/limn.42.06
Ruan de Oliveira Carneiro, C. Ferragut
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引用次数: 1

摘要

在恢复后的浅水湖泊和水库中,周生植物有助于维持贫营养状态。在两个中游环境实验中,我们评估了一个富营养化水库中周围植物对富集和营养稀释的反应。研究了分离氮磷和复合氮磷富集和稀释水平对人工基质上周围植物生物量和结构的影响。在20 cm深度的玻璃载玻片上培养14天(富集实验)和21天(稀释实验)。研究了氮、磷富集和稀释对周边植物藻类生物量、密度和种类组成的影响。磷是植物周周发育的主要限制因素。海藻密度和生物量对联合富集和分离富集P均有显著增加。只有75%的稀释对周围植物的生物量和藻类密度有显著的正向影响。在两个中观实验中,外周植物结构都发生了变化,与古尼茨氏菌(Kutz。)Smith对P富集响应正,对P稀释响应负。在富营养化水稀释50%和75%后,小檗复合体成为优势。我们的研究结果表明,在高富营养化条件下,主要的环境变化是水藻异质群落结构的必要条件。我们得出结论,在恢复过程中,浮游植物减少了与浮游植物的竞争和遮荫,浮游植物可以成为富营养化水库中重要的初级生产者。
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Periphyton responses to enrichment and nutrient dilution in two mesocosm experiments in a shallow hypereutrophic reservoir
Periphyton can contribute to maintaining oligotrophic conditions in restored shallow lakes and reservoirs. In two mesocosm experiments, we evaluated the periphyton responses to enrichment and nutrient dilution in a hypereutrophic reservoir. Effects of the isolated and combined N and P enrichment and dilution levels on periphyton biomass and structure on artificial substrate were investigated. For colonization of periphyton, glass slides were exposed for 14 days (enrichment experiment) and 21 days (dilution experiment) at 20 cm deep. We monitored the effects of N and P enrichment and dilution on the algal biomass, density, and species composition in the periphyton. P was a primary limiting factor for periphyton development. Periphyton algal density and biomass increased in response to combined and isolated P enrichment. Only the 75 % dilution had a positive and significant effect on biomass and algal density in the periphyton. In both mesocosm experiments, the periphyton structure changed, with Nitzschia palea (Kutz.) Smith responding positively to P enrichment and negatively to dilution. Achnanthidium minutissimum Complex becoming dominant following 50 % and 75 % eutrophic water dilution. Our results suggest that major environmental changes are necessary for a heterogeneous algal community structure in the periphyton in hypereutrophic con¬ditions. We conclude that, after a restoration process that reduces P-competition with phytoplankton and shading, periphyton can become an important primary producer in a hypereutrophic reservoir.
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来源期刊
Limnetica
Limnetica LIMNOLOGY-MARINE & FRESHWATER BIOLOGY
CiteScore
3.70
自引率
7.10%
发文量
26
审稿时长
>12 weeks
期刊介绍: Limnetica publishes original research articles on the ecology of inland waters. The scope of Limnetica includes the ecology of rivers, lakes, reservoirs, coastal lagoons and wetlands, as well as biogeochemistry, paleolimnology, development of new methodologies, taxonomy, biogeography and any aspect of theoretical and applied continental aquatic ecology such as management and conservation, impact assessment, ecotoxicology and pollution. Limnetica will accept for its publication scientific articles presenting advances in knowledge or technological development, as well as as papers derived from new practical approaches on the topics covered by the journal.
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