Rates of Accumulation of Phosphorus Forms in Lake Erie Sediments

1976 ◽  
Vol 33 (3) ◽  
pp. 430-439 ◽  
Author(s):  
J. D. H. Williams ◽  
T. P. Murphy ◽  
T. Mayer
Keyword(s):  
Lake Erie ◽  
Organic Phosphorus ◽  
Sediment Cores ◽  
Inorganic Phosphorus ◽  
Sedimentation Rates ◽  
Overlying Water ◽  
Fine Grained ◽  
Phosphorus Forms ◽  
Rate Of Sedimentation ◽  
Total Sedimentation

Six Lake Erie sediment cores from locations of widely different sedimentation rates show that rate of input and sedimentation of apatite phosphorus at a given locality has been approximately constant during the last few hundred years relative to total sedimentation rate at the same locality. Apatite is not a significant source of soluble phosphorus for Lake Erie. By contrast, rate of sedimentation of nonapatite inorganic phosphorus (NAIP) and organic phosphorus has steadily increased in accordance with increased loadings in recent years of the source material, namely phosphorus of anthropogenic origin. The rate of sedimentation of these two forms of phosphorus at a given locality varied greatly within the lake, and was greatest where the most fine-grained sediments were accumulating. It was concluded that the sediments of Lake Erie contain sufficient orthophosphate-retaining sites to prevent major regeneration of phosphate under any conceivable condition provided the overlying water remains oxic.

Forms of Phosphorus in the Surficial Sediments of Lake Erie

1976 ◽  
Vol 33 (3) ◽  
pp. 413-429 ◽  
Author(s):  
J. D. H. Williams ◽  
J-M. Jaquet ◽  
R. L. Thomas
Keyword(s):  
Lake Erie ◽  
Organic Phosphorus ◽  
Fine Sand ◽  
Inorganic Phosphorus ◽  
Organic Carbon Content ◽  
Fine Grained ◽  
Reactive Iron ◽  
Intimate Association ◽  
Nearshore Sediments ◽  
Iron And Manganese

The phosphorus in 48 surficial Lake Erie sediment samples was present in three major forms: phosphorus associated with apatite, nonapatite inorganic phosphorus (NAIP), and organic phosphorus. The apatite was of natural, detrital origin. It existed as particles ranging from fine sand to clay in size but mostly as silt-sized particles and was concentrated in nearshore sediments. Both NAIP and organic phosphorus was concentrated in fine-grained sediments accumulating in offshore depositional areas. NAIP was associated with amorphous hydrated ferric oxide in the oxidized microzone but was present as vivianite (Fe3(PO4)2∙8H2O) and possibly other forms also in the reduced zone. The organic phosphorus content of the sediment was closely related to organic carbon content. The phyllosilicate, organic matter, and reactive iron and manganese components of the sediments existed in intimate association.

scholarly journals Spatial and Seasonal Distribution and Transportation of Different Forms of Phosphorus in the Middle Reaches of the Yarlung Zangbo River

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1858 ◽  
Author(s):  
Xiaolong Cheng ◽  
Yanan Huang ◽  
Xunchi Pu ◽  
Ruidong An ◽  
Wendian Huang ◽  
...  
Keyword(s):  
Surface Sediments ◽  
Organic Phosphorus ◽  
Nutrient Status ◽  
Inorganic Phosphorus ◽  
Research Area ◽  
Phosphorus Concentration ◽  
Wet Season ◽  
Overlying Water ◽  
Total Phosphorus Concentration ◽  
Yarlung Zangbo River

The Yarlung Zangbo River basin ecosystem is fragile. The distribution and transportation of phosphorus is of great significance for aquatic environmental protection and ecological security. The sequential extraction method and molybdenum antimony anti-spectrophotometry were used to measure the concentrations of different forms of phosphorus in the surface sediments from 15 sampling sites along the middle reaches of the Yarlung Zangbo River and its tributaries. The results show that the total phosphorus concentration in the surface sediments is 194.0~540.7 mg/kg, which is mainly composed of inorganic phosphorus. The concentrations of various phosphorus forms ranked as calcium-bound phosphorus (355.6 ± 86.0 mg/kg) > soluble phosphorus (15.9 ± 10.0 mg/kg) > iron-bound phosphorus (12.4 ± 12.3 mg/kg) > organic phosphorus (9.6 ± 6.1 mg/kg) > occluded phosphorus (9.2 ± 3.8 mg/kg) > aluminum-bound phosphorus (5.4 ± 2.3 mg/kg). On the whole, phosphorus concentration is greater in wet season than dry season. Regarding the spatial distribution characteristics, there are great disparities in the different forms of phosphorus in the middle reaches of the Yarlung Zangbo River. Comprehensive analysis shows that phosphorus of this area is mainly self-generated, and concentration of bioavailable phosphorus is small, demonstrating there will not be a large release. We also drew a “specific triangle” of the different forms of phosphorus concentrations in the research area and defined the “α” angle to determine the nutrient status of the overlying water quickly and effectively. Finally, phosphorus flux of the mainstream was estimated. This research may provide information on the phosphorus of Plateau Rivers.

Inshore–Offshore Sedimentation Differences Resulting from Resuspension in the Eastern Basin of Lake Erie

1982 ◽  
Vol 39 (5) ◽  
pp. 748-759 ◽  
Author(s):  
J. Bloesch
Keyword(s):  
Lake Erie ◽  
Sediment Cores ◽  
Dry Weight ◽  
Sediment Traps ◽  
Particulate Phosphorus ◽  
Particulate Nitrogen ◽  
Eastern Basin ◽  
Fine Grained ◽  
Lake Bottom ◽  
Offshore Station

From June through October 1978 sediment traps were moored at three stations in an inshore–offshore transect in the Eastern Basin of Lake Erie. Settling fluxes measured with the traps exposed close to lake bottom were rather similar at all three stations during summer stratification, averaging 6.1 g∙m−2∙d−1 for dry weight, 293 mg∙m−2∙d−1 for particulate organic carbon (POC), 38 mg∙m−2∙d−1 for particulate nitrogen (PN), and 5.44 mg∙m−2∙d−1 for particulate phosphorus (PP). A comparison of the hypolimnetic traps with the epilimnetic traps at the offshore station indicated that considerable resuspension takes place even in summer. During fall, however, the nearshore sedimentation rates were markedly increased because of storm-induced bottom resuspension. By comparing the trap catches with sediment cores taken at all three stations, a resuspension model for dry weight, POC, and PN was developed. The calculations showed that newly formed organic material is resuspended and redeposited more frequently at nearshore locations than offshore. This repeated nearshore resuspension enhances decomposition of detritus, as shown by low relative phytoplankton activity in the hypolimnetic traps, and results in horizontal transport of fine-grained organic matter in the offshore direction. The significant POC and PN concentration differences found in the inshore–offshore transect of the bottom sediments can be explained by these two processes.Key words: sedimentation, sediment traps, sediment cores, resuspension, inshore–offshore differences

Variation in Soil Phosphorus Forms in Larix olgensis Plantations in Eastern Montane Area of Northeast China

2012 ◽  
Vol 518-523 ◽  
pp. 4801-4805
Author(s):  
Li Xin Chen ◽  
Wen Biao Duan
Keyword(s):  
Rhizosphere Soil ◽  
Organic Phosphorus ◽  
Soil Phosphorus ◽  
Inorganic Phosphorus ◽  
Field Investigation ◽  
Stand Age ◽  
Available Phosphorus ◽  
Larix Olgensis ◽  
Phosphorus Forms ◽  
Mature Stand

Variation in total phosphorus (TP), available phosphorus (AP), the forms of organic phosphorus (OP) and inorganic phosphorus (IP) in rhizosphere soil (RS) and non-rhizosphere soil (NRS) at different development stages in larch (Larix olgensis) plantations was quantitively studied through field investigation, chemical analysis and statistical test. The results indicated that: AP, O-P (occluded phosphate), TP, OP in RS exhibited a significantly or apparently decreased tendency over stand age, but IP, Ca-P (phosphate combined with calcium) and Fe-P (phosphate combined with Ferrum) in RS presented a significantly or apparently increased trend when stand age increased; Ca-P in NRS increased when stand age became larger; Fe-P in half-mature stand (HMS), AP and Fe-P in near mature stand (NMS), AP and Ca-P in mature stand (MS) in NRS was higher than in RS

210Pb–226Ra–230Th systematics in very low sedimentation rate sediments from the Mendeleev Ridge (Arctic Ocean)This article is one of a series of papers published in this Special Issue on the theme Polar Climate Stability Network.GEOTOP Publication 2008-0031.

2008 ◽  
Vol 45 (11) ◽  
pp. 1207-1219 ◽  
Author(s):  
Christelle Not ◽  
Claude Hillaire-Marcel ◽  
Bassam Ghaleb ◽  
Leonid Polyak ◽  
Dennis Darby
Keyword(s):  
Arctic Ocean ◽  
Water Column ◽  
Natural Radionuclides ◽  
The Arctic ◽  
Sedimentation Rates ◽  
Overlying Water ◽  
Fine Grained ◽  
Polar Climate ◽  
Climate Stability ◽  
Precise Knowledge

U-series isotope behaviour in subsurface sediment of the Arctic Ocean is investigated based on high resolution measurements of natural radionuclides (210Pb, 226Ra, 230Th) and a few analyses of anthropogenic 137Cs in cores collected during the 2005 Healy-Oden Trans-Arctic Expedition (HOTRAX). Cores from the Mendeleev Ridge, representing distinct bathymetric settings, are analyzed in more detail as a means to assess the dating potential of such radionuclides at sites characterized by very low sedimentation rates (∼3 mm ka–1). The sediment consists of variable proportions of fine-grained carbonates, clays, and ice-rafted debris and shows excesses in 210Pb (210Pbxs) over parent 226Ra content, down to ∼1 cm below core top. This 210Pbxs distribution is due to shallow mixing by benthic organisms and (or) diffusion from the sediment–water interface, as also indicated by 137Cs activities. From ∼1 to 7 cm downcore, 210Pb activities closely follow 226Ra activities. Below 7 cm downcore, 226Ra activities are controlled by variable excesses in parent 230Th (230Thxs) resulting from its scavenging in the overlying water column. 226Ra diffusion is observed towards the water column occuring from the upper ∼7 cm of sediment below the seafloor (with a flux of ∼0.043 disintegrations per minute (dpm) cm–2 a–1) and deeper in the sediment below 230Thxs peaks but with lesser fluxes. Both cores show identical 210Pb profiles despite their 1 km bathymetric difference. This suggests negligible 230Th and 210Pb scavenging below water depths of ∼1.6 km, i.e., the bathymetry of the shallower core. In such settings where sedimentation rates are very low and vertical particle rain is the major sediment source, estimates of the actual 210Pbxs require precise knowledge of the 226Ra-supported fraction, which is controlled by 230Thxs, Ra diffusion, and thus sedimentation rates and porosity.

scholarly journals Pecularities of Phosphorus Forms Dynamics in Bottom Sediments of River Dniester (Moldova)

2012 ◽  
Vol 7 (2) ◽  
pp. 78-83
Author(s):  
V. Rusu ◽  
L. Postolachi ◽  
A. Maftuleac ◽  
T. Lupascu
Keyword(s):  
Bottom Sediments ◽  
Seasonal Dynamics ◽  
Interstitial Water ◽  
Organic Phosphorus ◽  
Spatial Dynamics ◽  
Inorganic Phosphorus ◽  
Phosphorus Forms

Seasonal, spatial and multi-annual dynamics of phosphorus forms in bottom sediments and their interstitial water for river Dniester was evaluated. The spatial dynamics of phosphorus forms in the bottom sediments along river had, in general, the same trend during of 2004 and 2009 years, being recorded the increasing tendency along river Dniester for inorganic phosphorus and decreasing tendency for organic phosphorus. Multi-annual dynamics for 2004-2010 years showed a tendency of increasing of all phosphorus forms in bottom sediments; the highest values being registered during 2010 year. Spatial and seasonal dynamics of phosphorus forms in bottom sediments and their interstitial water were generally in correspondence, although sometimes with some differences.

MINERALIZATION OF SOIL ORGANIC PHOSPHORUS WITH PARTICULAR REFERENCE TO THE EFFECT OF LIME

1963 ◽  
Vol 43 (1) ◽  
pp. 97-106 ◽  
Author(s):  
R. L. Halstead ◽  
J. M. Lapensee ◽  
K. C. Ivarson
Keyword(s):  
Phosphorus Content ◽  
Organic Phosphorus ◽  
Acid Soils ◽  
Inorganic Phosphorus ◽  
Eastern Canada ◽  
Surface Samples ◽  
Soil Organic Phosphorus ◽  
Repressive Effect ◽  
Partial Sterilization ◽  
Positive Effect

In a laboratory experiment, liming resulted in an average decline of 3.6 per cent in the total organic phosphorus content of incubated surface samples of seven acid soils from eastern Canada. Increases of 2.6 and 5.1 per cent in 1N H2SO4- and 4N HCl-soluble inorganic phosphorus, respectively, and a decrease of 46.4 per cent in NaHCO3-soluble organic phosphorus (pH 8.5) provided further evidence of mineralization of organic phosphorus following liming. There was some evidence, however, that the differences in NaHCO3-soluble organic phosphorus following liming were due only in part to mineralization, since Ca(OH)2 added to a soil just prior to extraction with NaHCO3 had a repressive effect on the solubility of the organic phosphorus compounds.Some mineralization of organic phosphorus occurred when unlimed samples were incubated in the laboratory for 9 months.Marked increases in microbiological activity, as indicated by increased numbers of microorganisms, and increased CO2 and NO3-nitrogen production, were associated with lower values for extractable organic phosphorus following liming. Partial sterilization of samples with toluene lowered biological activity in the unlimed and limed samples. Toluene was found, however, to have a positive effect on release of phosphorus from organic form.

scholarly journals Behaviour of Metal(loid)s at the Sediment-Water Interface in an Aquaculture Lagoon Environment (Grado Lagoon, Northern Adriatic Sea, Italy)

2021 ◽  
Vol 11 (5) ◽  
pp. 2350
Author(s):  
Elisa Petranich ◽  
Matteo Crosera ◽  
Elena Pavoni ◽  
Jadran Faganeli ◽  
Stefano Covelli
Keyword(s):  
Sediment Cores ◽  
Fish Farm ◽  
Trophic Chain ◽  
Water Interface ◽  
Northern Adriatic Sea ◽  
Overlying Water ◽  
Northern Adriatic ◽  
In Situ Experiments ◽  
Diffusive Fluxes ◽  
Lagoon Environment

The cycling of metal(loid)s at the sediment–water interface (SWI) was evaluated at two selected sites (VN1 and VN3) in an active fish farm in the Grado Lagoon (Northern Adriatic, Italy). In situ experiments using a transparent benthic chamber and the collection of short sediment cores were performed, to investigate the behavior of metal(loid)s in the solid (sediments) and dissolved (porewaters) phases. Total and labile concentration of metal(loid)s were also determined in sediments, to quantify their potential mobility. Comparable total concentrations were found at both sites, excluding As, Mn, Pb and V, which were higher at VN3. Metal(loid) porewater profiles showed a diagenetic sequence and a close dependence with redox (suboxic/anoxic) conditions in the surface sediments. Positive diffusive fluxes along with benthic fluxes, particularly at the more oxic site, VN1, were found for almost all metal(loid)s, indicating their tendency to migrate towards the overlying water column. Despite sediments at two sites exhibiting high total metal(loid) concentrations and moderate effluxes at the SWI, the results suggest that they are hardly remobilized from the sediments. Recycling of metal(loid)s from the SWI would not constitute a threat for the aquatic trophic chain in the fish farm.

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