Phosphorus spatial distribution and mass balance in the Itaipu lagoon (Rio de Janeiro, Brazil)

IF 1 4区 地球科学 Q3 MARINE & FRESHWATER BIOLOGY
M. Lobo, Daniel Loureiro, A. Nepomuceno, Leandro Alves, F. Lamego
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Abstract

areas of the least developed countries has been associated with an increase in impermeable areas and poor domestic sewage treatment, increasing land-based runoff of nutrients and suspended solids from catchments. This study aimed to assess the biogeochemical changes caused by human interventions through the analysis of the spatial distribution of sedimentary phosphorus (P) and its mass balance in the Itaipu lagoon, located on the east coast of the state of Rio de Janeiro. Human intervention in the Itaipu lagoon system has caused severe imbalances in biogeochemical cycles over the past decades. Watercourses have been channeled to normalize the hydrological regime and increase hydraulic energy, improving sediment transport capacity. In this context, the increase in runoff from the coastal urban basin into the Itaipu lagoon has buried an increasing amount of phosphorus in the sediment. Recently, a regional increase in storm events caused a series of landslides and floods, which have been reported as possible consequences of global climate change. In recent decades, the synergy between landslides and river channeling has increased TP loads, accelerating phosphorus settling and changing P spatial distribution in surface sediments. This has accelerated siltation of the lagoon with an accumulation of nutrients and organic matter, leading in some cases to sediment anoxia. The lagoon has undergone strong eutrophication, changing its trophic state from meso-to hypertrophic in less than 30 years, even though P loads are not as high as in other coastal lagoons. Our findings confirm that human intervention impacts nutrient loads, which in turn disrupt the balance of biogeochemical cycles, compromising coastal water resources. This leads to the collapse of ecosystem services, another step towards degrading planetary boundaries. Abstract
巴西Itaipu泻湖磷的空间分布与质量平衡
在最不发达国家的一些地区,不透水地区增加,家庭污水处理不良,从集水区流出的营养物质和悬浮固体增加。本研究旨在通过分析巴西里约热内卢州东海岸伊泰普泻湖沉积磷的空间分布及其质量平衡,评估人为干预引起的生物地球化学变化。在过去的几十年里,人类对伊泰普泻湖系统的干预造成了生物地球化学循环的严重失衡。水道已疏通,使水文制度正常化,增加水力能,提高输沙能力。在这种情况下,从沿海城市盆地进入伊泰普泻湖的径流的增加已经在沉积物中埋下了越来越多的磷。最近,区域性风暴事件的增加导致了一系列山体滑坡和洪水,据报道这可能是全球气候变化的后果。近几十年来,滑坡和河道的协同作用增加了磷负荷,加速了磷沉降,改变了表层沉积物中磷的空间分布。这加速了泻湖的淤积和营养物质和有机物的积累,在某些情况下导致沉积物缺氧。该泻湖经历了强烈的富营养化,在不到30年的时间里从中营养状态转变为富营养化状态,尽管磷负荷不像其他沿海泻湖那么高。我们的研究结果证实,人类干预会影响养分负荷,从而破坏生物地球化学循环的平衡,损害沿海水资源。这会导致生态系统服务的崩溃,这是地球边界退化的又一步。摘要
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来源期刊
CiteScore
1.60
自引率
12.50%
发文量
21
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