Co-occurrence and potential chemical competition of phosphorus and silicon in lake sediment

Hartikainen, Helinä; Pitkänen, Marja; Kairesalo, Timo; Tuominen, Liisa

doi:10.1016/0043-1354(96)00139-x

Cited by 53 publications

(39 citation statements)

References 23 publications

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“…Além disso, a redução e a conseqüente dissolução dos óxidos de Fe podem diminuir o número de sítios de adsorção de fosfato do solo durante o período inicial de inundação (Mello et al, 1992). Mais recentemente, tem-se considerado o efeito da concentração de Si influenciando a mobilização de P (Hartikainen et al, 1996; Figura 5 -Variação nos teores de P em solução durante o período de inundação. Tuominen et al, 1998;Koski-Vähälä et al, 2001).…”

Section: Resultados E Discussão Ferrounclassified

“…No entanto, não se observou correlação significativa entre o carbono orgânico total e as várias frações das substâncias húmicas e o P em solução (Tabela 3). De modo semelhante, os teores de Si e de Al em solução não apresentaram correlação significativa com os teores de P em solução (valores não apresentados), apesar de alguns autores considerarem a possibilidade da competição entre o Si e o P em solução (Hartikainen et al, 1996;Tuominen et al, 1998;Koski-Vähälä et al, 2001). Apesar dos teores de Si e de Al em solução não terem mostrado efeitos diretos sobre a dinâmica do P, o teor de P em solução parece ser influenciado pela relação Si/Al da solução (Tabela 3).…”

Section: Resultados E Discussão Ferrounclassified

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Dinâmica da mobilização de elementos em solos da Amazônia submetidos à inundação

et al. 2005

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RESUMOParte significativa de solos da Amazônia permanece saturada ou inundada por períodos que podem variar de alguns dias a vários meses, em decorrência de enchentes ou deficiência de drenagem em algumas áreas, resultando em alterações químicas, físicas e biológicas nos solos. Este trabalho foi conduzido com o objetivo de avaliar a dinâmica da mobilização de Al, Ca, Fe, K, Mg, Mn, Na, Si e P em solos da Amazônia submetidos a inundação. Amostras de vários solos foram submetidas à inundação durante seis meses. Alíquotas da solução foram coletadas periodicamente durante o tempo de inundação e determinaram-se os teores dos diversos elementos em solução. A inundação influenciou a cinética dos elementos, com aumento da mobilização dos mesmos, principalmente, nas primeiras semanas. Os teores de Fe em solução foram mais elevados para os solos mais ricos em Fe amorfo. Em amostras com baixos teores de Fe amorfo e baixo conteúdo de matéria orgânica, os teores de Fe em solução foram muito reduzidos. O teor de P em solução foi influenciado por todas as formas de P. O P ligado ao Fe foi a forma que maior influência exerceu sobre o teor de P solúvel. Os teores dos cátions Ca, Mg, K e Na, em solução, foram diretamente influenciados por seus respectivos teores trocáveis, bem como pela cinética do Fe e do Mn. PALAVRAS CHAVESCinética; alterações ambientais; ecossistemas amazônicos; solos de várzea. Dinamics of elements in soils from Amazonia after controlled inundation ABSTRACT

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Section: Resultados E Discussão Ferrounclassified

Dinâmica da mobilização de elementos em solos da Amazônia submetidos à inundação

et al. 2005

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“…In the Enonselkä basin, a stepwise increase in the epilimnetic phosphorus concentration was regularly recorded in early June during the 1980s (Figure 4), which could not be explained by the traditional means, i.e. neither by external-nor sediment-derived phosphorus inputs (Kairesalo, et al, 1995;Hartikainen et al, 1996). This phosphorus increase, however, coincided with the early-summer migration of adult roach populations from the littoral areas to the pelagic zone (Peltonen & Horppila, 1992;Horppila 1994b).…”

Section: Ecological Basis For the Management Of Lake Vesijärvimentioning

confidence: 94%

Direct and indirect mechanisms behind successful biomanipulation

Kairesalo

Laine

Luokkanen

et al. 1999

The Ecological Bases for Lake and Reservoir Management

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Lake Vesijärvi is a relatively large (length 25 km; total area 110 km 2 ), shallow (mean depth 6 m), but stratified lake in southern Finland. The Enonselkä basin (26 km 2 ), surrounded by the city of Lahti, received its sewage effluent, and changed from a clear water basin with flourishing fisheries from the 1940-50s to one of the most eutrophic lake systems in Finland thereafter. In 1976, the sewage effluent was diverted, resulting in a temporary recovery of water quality. However, in the 1980s, massive surface scums of cyanobacteria degraded the water quality and arrested the recovery of the lake. A restoration strategy providing an ecologically sound basis for the management of the lake was initiated in 1987. This strategy involved biomanipulation (mass removal of coarse fish) together with conventional pollution control measures on discharges to the lake. Biomanipulation was chosen instead of much more expensive chemical and/or technical methods, such as chemical treatment or dredging of the profundal sediment. The large-scale biomanipulation trial was carried out in the Enonselkä basin during 1989-93. Following the mass removal of coarse fish (1000 metric tons of fish; mainly roach and smelt), the biomass of cyanobacteria collapsed concomitantly with a decline of total phosphorus concentration from 45 to 35 mg P m −3 , and with an increase of Secchi depth from 1 m to 3.5 m. These observed improvements in the water quality were matched with a large decline in roach-mediated phosphorus movement from littoral to pelagial, from 100 mg P m −2 in 1989 to 15 mg P m −2 in 1993. Year-to-year variation within the littoral communities, and in the recruitment of fish, could in this way cause large oscillations in the whole ecosystem. The involvement of local people (fishermen, farmers etc.) in controlling non-point nutrient loading and fish stock development, is of prime importance for the long term success of lake restoration.

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“…Silicon-rich ferric particles are evidently abundant in some freshwater environments (Carlson & Schwertmann 1981) and are readily formed under laboratory conditions (Anderson & Benjamin 1985, Mayer & Jarrell 2000. Direct quantification of iron-bound Si (Fe−Si) in sediments is currently not analytically possible, but certain chemical extraction schemes indicate a considerable Fe−Si pool in the Baltic (Tallberg et al 2009) and in other coastal marine sediments (Tallberg et al 2008), as well as in freshwater lakes (Hartikainen et al 1996). Geohistorically, it is also worth noting that adsorption of DSi onto iron oxides has been proposed as a key process in the formation of iron and silicon-rich laminated sedimentary rocks in the Neoarchean− Paleoproterozoic transition (ca.…”

Section: Similar Responses Of Dip and Dsi Fluxes To Oxygenated Conditmentioning

confidence: 99%

Nutrient fluxes from reduced Baltic Sea sediment: effects of oxygenation and macrobenthos

Ekeroth¹,

Blomqvist²,

Hall³

2016

Mar. Ecol. Prog. Ser.

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Effects of bottom water oxygenation and macrofaunal colonisation on benthic fluxes of nitrogen (N), phosphorus (P) and silicon (Si) from long-term anoxic Baltic Sea bottom sediment were investigated. Sediment boxcosms from an anoxic site at 150 m depth in the open Baltic proper were incubated in the laboratory to follow the development of benthic nutrient fluxes during 74 d exposure to flow-through of oxygen-rich water. In contrast to traditional end-point experimental designs, our repeated measurement approach allowed for separation of transient and long-term effects of oxygenation and bioturbation on benthic nutrient recycling. The composition, but not the rate, of the benthic total dissolved N efflux changed by oxygenation from being dominated by NH 4 in situ to being mostly composed of NO 2 + NO 3 and dissolved organic N (DON) under oxic conditions. Oxygenation in the boxcosms decreased the benthic efflux of dissolved silicate (DSi) and essentially shut off the in situ flux of dissolved inorganic phosphorus (DIP). After 20 d of oxygenation, 2 bottom macrofauna taxa, the polychaete Marenzelleria spp. and the amphipod Monoporiea affinis, were introduced to a subset of the boxcosms. Bioturbation by either taxa increased the efflux of dissolved inorganic N (DIN), DON and DSi to the overlying water. The Prich benthic flux under in situ anoxic conditions roughly approached Redfield N:P stoichiometry after oxygenation in the sediment boxcosms. Upon addition of macrofauna, bioturbation generated even higher N:P flux ratios.

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Co-occurrence and potential chemical competition of phosphorus and silicon in lake sediment

Cited by 53 publications

References 23 publications

Dinâmica da mobilização de elementos em solos da Amazônia submetidos à inundação

Dinâmica da mobilização de elementos em solos da Amazônia submetidos à inundação

Direct and indirect mechanisms behind successful biomanipulation

Nutrient fluxes from reduced Baltic Sea sediment: effects of oxygenation and macrobenthos

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