Dissolved silica dynamics, transfer and retention in a temperate groundwater flow-through shallow lake of the Pampean Plain, Argentina

Natalia Borrelli; Asuncion Romanelli; Mariana Fernandez HonaineMarcelo FarengaAna FabianiKarina Soledad EsquiusMargarita Osterrieth

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Dissolved silica dynamics, transfer and retention in a temperate groundwater flow-through shallow lake of the Pampean Plain, Argentina

机译：Dissolved silica dynamics, transfer and retention in a temperate groundwater flow-through shallow lake of the Pampean Plain, Argentina

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Mainly through BSi processing, shallow lakes regulate DSi retention, transport, and delivery to the ocean. However, these DSi fluxes in southern lakes are little known. This work evaluated the spatio-temporal variation and the main factors that affect DSi dynamics and retention in a temperate groundwater flow-through shallow lake in Argentina. Water samples from streams, the lake, and groundwater were collected from Los Padres Lake Watershed for DSi determination. DSi retention was calculated through a mass balance approach. The BSi pool from macrophytes was quantified using biomass, BSi production, and satellite images. The phytoplankton community was described by chlorophyll content, species quantification, and alpha diversity metrics. The contribution of Si-enriched water from groundwater (≈ 50 mg L~(-1)) mainly controlled DSi concentrations in the inflow stream (≈ 54 mg L~(-1)). Lake DSi concentration was lower than streams and groundwater, and increased over time (14-34 mg L~(-1)). BSi contribution by macrophytes (≈1.4 Mg Si year~(-1)) has little variation, therefore, the reduction of diatoms due to cyanobacteria increase is the most likely factor controlling DSi dynamics, influencing the role of the lake as a DSi sink/source. These biogeochemical processes regulated the DSi transfer from the lake to the outflow stream, and the delivery to the ocean (≈ 630 Mg Si year~(-1)). Given the importance of small lakes in nutrient cycling and retention along flow paths within a watershed, in-lake Si processes and Si sources to these water bodies are critical to quantifying limnetic contributions to the global Si cycle.

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《Aquatic sciences》 |2023年第1期|10.1-10.13|共13页
作者
Natalia Borrelli; Asuncion Romanelli; Mariana Fernandez HonaineMarcelo FarengaAna FabianiKarina Soledad EsquiusMargarita Osterrieth;
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作者单位

Instituto de Geologia de Costas y del Cuaternario, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Comision de Investigaciones Cientificas, Funes 3350, Mar del Plata 7600, Argentina, Instituto de Investigaciones Marinas y;

Instituto de Geologia de Costas y del Cuaternario, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Comision de Investigaciones Cientificas, Funes 3350, Mar del Plata 7600, Argentina;

Instituto de Investigaciones Marinas y Costeras, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Funes 3350, Mar del Plata 7600, ArgentinaInstituto de Investigaciones Marinas y Costeras, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Consejo Nacional de Investigaciones Cientificas y Tecnicas, Funes 3350, Mar del Plata 7600, Argentina, Laboratorio de Microbi;

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收录信息美国《科学引文索引》(SCI);
原文格式 PDF
正文语种英语
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关键词
Dissolved silica dynamics; Biogenic silica; Temperate shallow lakes; Groundwater; Silica biogeochemical cycle;

Dissolved silica dynamics, transfer and retention in a temperate groundwater flow-through shallow lake of the Pampean Plain, Argentina

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