利用生态指标评价热带城市化河口富营养化

Journal of Integrated Coastal Zone Management Pub Date : 2022-09-01 DOI:10.5894/rgci-n379

V. M. Aguiar, J. A. Baptista Neto, Estefan Monteiro da Fonseca

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引用次数: 0

摘要

在Guanabara湾（巴西里约热内卢）入口处的两个亚海湾获得了溶解营养物质、浮游植物生物量和其他辅助变量，并使用复合营养状态指数（TRIX）来评估研究区域的水质。还通过评估营养物质、浮游植物生物量和其他沉积变量，研究了底部沉积物在营养物质动力学中的作用，因为该隔间是人为输入的地质记录。在旱季的小潮和大潮期间，对东边缘的Jurujuba Sound和西边缘的Flamengo Botafogo Sounds进行了采样。富营养化的迹象是通过两个边缘溶解氧浓度的极端变化检测到的，在Jurujuba湾（2.20-14.07 mg.l-1）更为突出。溶解无机氮在两个边缘都升高，主要由铵组成，在Flamengo Botafogo湾超过87%，这表明海湾西部边缘仍有未经处理的污水输入。TRIX显示，研究区域大多数站点的水质较差，Jurujuba Sound的水质为4.53至7.29，Flamengo Botafogo Sounds的水质为5.67至7.87。从小潮到大潮，TRIX在两个边缘都有增加，表明水质下降。两个边缘之间的粒度差异在养分动力学中起着关键作用，Jurujuba湾以细粒沉积物为主，而相对边缘则以粗颗粒为主。Jurujuba湾细粒沉积物的优势有利于高浓度TOC（0.87-6.57%）和无机磷（154.34-1516.82µg.g-1）的积累。对水柱和海底沉积物富营养化的评估表明，由于经常性的人为输入，Guanabara湾入口处的这一过程得以维持，这需要公共政策采取紧急行动来缓解这种情况。

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Assessment of eutrophication through ecological indicators at the entrance of a tropical urbanized estuary

Dissolved nutrients, phytoplankton biomass and other ancillary variables, were obtained at two sub-embayments at the entrance of Guanabara Bay (Rio de Janeiro, Brazil) and a composite trophic status index (TRIX) was used to assess the water quality of the study area. The role of bottom sediments in nutrient dynamics was also investigated through the evaluation nutrients, phytoplankton biomass and other sedimentary variables, since this compartment acts as a geological record of anthropogenic input. Jurujuba Sound, at the east margin, and Flamengo-Botafogo Sounds, at the western margin, were sampled during neap and spring tides in the dry season. Signs of eutrophication were detected through the extreme variations of dissolved oxygen concentrations at both margins, being more accentuated at Jurujuba Sound (2.20-14.07 mg.l-1). Dissolved inorganic nitrogen was elevated at both margins and mostly composed of ammonium, surpassing 87% at Flamengo Botafogo Sounds, which suggests a continued input of raw sewage at the western margin of the bay. TRIX revealed poor water quality for most stations at the study area, varying from 4.53 to 7.29 at Jurujuba Sound and from 5.67 to 7.87 at Flamengo-Botafogo Sounds. The increase of TRIX from neap to spring tide was registered at both margins, revealing decrease of water quality. The differences in grain size between both margins played a key role in nutrient dynamics, with predominance of fine sediments at Jurujuba Sound and coarser particles at the opposite margin. Accumulation of high concentrations of TOC (0.87-6.57%) and inorganic phosphorus (154.34-1516.82 µg.g-1) were favored by the predominance of fine sediments at Jurujuba Sound. The assessment of eutrophication in water column and bottom sediments revealed the maintenance of this process at the entrance of Guanabara Bay sustained by the recurrent anthropogenic input, what demands urgent action from public policies to mitigate this situation.

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来源期刊

Journal of Integrated Coastal Zone Management Environmental Science-Water Science and Technology

CiteScore

2.00

自引率

0.00%

发文量

期刊介绍： Journal of Integrated Coastal Zone Management / Revista de Gestão Costeira Integrada is a peer-reviewed international journal that publishes articles dealing with all the subjects related to coastal zones and their management, namely focused on coastal oceanography (physical, geological, chemical, biological), engineering, economy, sedimentology, sociology, ecology, history, pollution, laws, biology, anthropology, chemistry, politics, etc. Published papers present results from both fundamental as well as applied, or directed research. Emphasis is given to results on interdisciplinary contributions, on management tools and techniques, on innovative methodological or technical developments, on items with wide general applicability, and on local or regional experiments that can be a source of inspirations to other regions. Journal of Integrated Coastal Zone Management is focused on coastal environments what means that embraces a wide area that extends from an indefinite distance inland to an indefinite limit seaward. Paleoenvironments, ancient shorelines, historical occupation, diachronically analysis and legislation evolution are some subjects considered to fall within the purview of the journal as well.