Geochemistry of Sediment Phosphorus Impacted by High Calcium Export from the Catchments: A Case Study

Chen, Yijing; Wu, Shang-Chuen

doi:10.1089/ees.2006.0130

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…Diversos estudios han confirmado la prevalencia del enlace del Ca con el ortofosfato en aguas procedentes de zonas cárstica (López & Morgui, 1993;Chen & Wu, 2007), convirtiéndose el P en el nutriente limitante de este tipo de agua (Fourqurean et al, 1993). Galvez et al (1993) reportaron un embalse de cuenca cárstica y aguas duras donde el P no precipitó con el CaCO 3 .…”

Section: Discusi óNunclassified

Variabilidad iónica y características tróficas del embalse de Abreus, Cuba

Betancourt¹,

Suárez²,

Toledo³

2010

Limnetica

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Ionic variability and trophic characteristics of the Abreus reservoir, CubaThe Abreus reservoir is located in the Cienfuegos province, in mid-southern Cuba. It was built in 1986 for irrigation purposes but at present it is also used for industrial purposes. It is affected by agricultural, human and industrial wastes. In order to investigate the ionic variation, a temporal series of main compounds taken from a database generated from 1987 to 2005 was used. The descriptive statistics, seasonal behavior, and the relationship among variables were evaluated, and a principal component analysis was performed for data reduction. Water was slightly saline and very hard, with a high correlation among variables, which allowed them to be grouped in a new variable called "mineralization". This new variable had a marked seasonal behavior with signiſcant differences between two periods, from November to May, in which the water has a higher saline content and is inƀuenced by evaporation, and from June to October, when the composition of the water is inƀuenced by the rain. The values obtained for the seasonal indexes of the variables studied corroborate the signiſcant differences in the mineralization between both periods. This information is considered relevant for better water management. To evaluate the trophic status, ſve sampling campaigns were carried out between 2008 and 2009, in which water transparency was measured using Secchi's Disc, as well as total phosphorous (P T ) concentration, total inorganic nitrogen (Ni T ), and chlorophyll a. In spite of the high values of hardness, P T registered high values, classifying the reservoir as eutrophic. The nitrogen was the limiting nutrient for the phytoplanktonic growing. For this reason it must be regulated in order to control the reservoirs eutrophication.

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Section: Discusi óNunclassified

Variabilidad iónica y características tróficas del embalse de Abreus, Cuba

Betancourt¹,

Suárez²,

Toledo³

2010

Limnetica

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“…During urban development, rates of soil erosion can climb to levels that are typically 200 times above background conditions, with the eroded sediments entering waterways and causing harm to the biota living therein, which has been identified as a contributor to the eutrophication of Lake Simcoe (Trenouth et al 2013). In the Feitsui Reservoir, Taiwan, groundwater outbursts carrying Ca exports occurred during tunnel construction at the catchments, which had impacted sediment phosphorus (P) geochemistry (Chen and Wu 2007). Shortly, the effects of soil erosion on nutrient cycling in lakes are finally reflected by sediment.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of sediment phosphorus release during a tunnel construction across an urban lake (Lake Donghu, China)

Wang

Xiao

et al. 2016

Environ Sci Pollut Res

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Tunnel construction in watershed area of urban lakes would accelerate eutrophication by inputting nutrients into them, while mechanisms underlying the internal phosphorus cycling as affected by construction events are scarcely studied. Focusing on two main pathways of phosphorus releasing from sediment (enzymatic mineralization and anaerobic desorption), spatial and temporal variations in phosphorus fractionation, and activities of extracellular enzymes (alkaline phosphatase, β-1,4-glucosidase, leucine aminopeptidase, dehydrogenase, lipase) in sediment were examined, together with relevant parameters in interstitial and surface waters in a Chinese urban lake (Lake Donghu) where a subaqueous tunnel was constructed across it from October 2013 to July 2014. Higher alkaline phosphatase activity (APA) indicated phosphorus deficiency for phytoplankton, as illustrated by a significantly negative relationship between APA and concentration of dissolved total phosphorus (DTP). Noticeably, in the construction area, APAs in both sediment and surface water were significantly lower than those in other relevant basins, suggesting a phosphorus supply from some sources in this area. In parallel, its sediment gave the significantly lower iron-bound phosphorus (Fe(OOH)∼P) content, coupled with significantly higher ratio of iron (II) to total iron content (Fe 2+ / TFe) and dehydrogenase activities (DHA). Contrastingly, difference in the activities of sediment hydrolases was not significant between the construction area and other basins studied. Thus, in the construction area, subsidy of bioavailable phosphorus from sediment to surface water was attributable to the anaerobic desorption of Fe(OOH)∼P rather than enzymatic mineralization. Finally, there existed a significantly positive relationship between chlorophyll a concentration in surface water and Fe(OOH)∼P content in sediment. In short, construction activities within lakes may interrupt cycling patterns of phosphorus across sediment-water interface by enhancing release of redox-sensitive phosphate, and thereby facilitating phytoplankton growth in water column.

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