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Showing 1 to 15 of 15 for “"Phosphorus retention"”.
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Mechanisms governing phosphorus retention in streams
… chemical element necessary for life. In streams, phosphorus is typically one of the most important nutrients and often limits microbial (algae, bacteria, and fungi) growth. As a result, retention of phosphorus within streams largely determines productivity. Factors that influence retention include …
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Predicting the effect of wetland restoration on phosphorus retention, Northwest Minnesota
… that restoring wetlands can actually release phosphorus (P) into solution. Reducing conditions caused by soil flooding can release Fe-bound P, since ferrous Fe is more soluble than ferric Fe. Little is known concerning how the soils in the Red River Valley will be affected by wetland …
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Phosphorus Retention and Transformation in Floodplain Forests of the Southeastern United States
Phosphorus (P) commonly limits productivity in freshwater ecosystems; thus, increased P loading, either in dissolved (DP) or particulate (PP) form, can lead to eutrophication. The central goal of my dissertation research is to understand these biogeochemical mechanisms of P retention and …
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Influence of vegetation on sediment bacterial community structure, microbial enzyme activities and phosphorus retention in constructed freshwater wetlands
… structure, microbial enzyme activities, and phosphorus retention capacity of constructed wetland systems. A greenhouse experiment was conducted using unvegetated or vegetated mesocosms with Juncus effusus, Carex lurida or Dichanthelium acuminatum var. acuminatum in monoculture or mixed …
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Phosphorus Retention and Fractionation in Masonry Sand and Light Weight Expanded Shale Used as Substrate in a Subsurface Flow Wetland
… an inefficient technology for long-term phosphorus (P) removal. The P retention effectiveness of subsurface wetlands can be improved by using appropriate substrates. The objectives of this study were to: (i) use sorption isotherms to estimate the P sorption capacity of the two materials, …
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The ecophysiological significance of insectivory as well as nitrogen and phosphorus availability to sundew nutrient cycling, growth, and success
… performed by enclosing insects and/or adding phosphorus and/or nitrogen to the soil. None of the species significantly benefitted from insect capture nutritionally or energetically in nutrient-poor or rich soils. Added nutrients to the soil or by foliar insect feeding decreased phosphorus …
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Effect of dietary calcium and phosphorus levels on magnesium utilization in sheep
… the effects of feeding two levels of calcium and phosphorus alone and in combination, on magnesium utilization in ruminants. Twelve wether lambs were used in two metabolism trials. The two levels of calcium were 0.4 and 1.4% and the two levels of phosphorus were 0.3 and 1.3%. Apparent magnesium …
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Legacies of Early 20th Century Logging in Southern Appalachian Streams
… were less abundant in logged streams and the retention of fines decreased as wood volume decreased. Species diversity was similar between streams in unlogged and logged catchments; however, the abundance of several taxa and functional feeding groups did differ. Streams in unlogged catchments …
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Phosphorus Losses in Runoff from Virginia Soils
… and used in a rainfall simulation study. Phosphorus retention among separated clay fractions and whole soils were related to Al bearing minerals such as hydroxy-interlayered vermiculite (HIV), gibbsite, and amorphous Al. Samples dominated by kaolinite retained very little P. Application of …
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Hydrothermal Liquefaction of Municipal Sludge: Feedstock Composition, Inorganic Interactions, and Co-Liquefaction as a Dewatering Alternative
… lime addition and an enhanced biological phosphorus removal (EBPR) facility, supplemented by controlled alkaline additive experiments and a co-liquefaction study. Reactions were carried out at 350 °C for 20–60 min at 10–20 wt.% solids in 75 mL Parr reactors, with products characterized by …
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Load reduction and invasive mussel effects on eutrophication dynamics in Saginaw Bay, Lake Huron
<p>Phosphorus load reduction and dreissenid invasion are the two most important factors that influence europhication dynamics in the Great Lakes. The 1978 amendments to the Great Lakes Water Quality Agreement (GLWQA) between the United States and Canada established target phosphorus loads for the …
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Phosphorus bioavailability and digestibility in canola meals determined by different methods
… in the TCM, CCM, and SBM relative to KH2PO4. A phosphorus-deficient cornstarch-dextrose-SBM basal diet was fed as Diet 1. Diets 2 and 3 had 0.05% or 0.10% P added from KH2PO4, respectively. The remaining diets had 12.5% or 25% TCM, CCM, or SBM added in place of cornstarch and dextrose. …
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Nutrient removal and greenhouse gas emissions from 20 year old constructed wetlands receiving tile drainage water: a biogeochemical analysis
Restriction data tranferred 2014-07-01T11:39:44-05:00 Original Data Group with Access Administrator Release Date: 2016-05-30 12:21:23 UTC Reason: Author requested closed access (OA after 2yrs) in Vireo ETD system
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Digestibility of calcium and phosphorus and effects of microbial phytase in diets fed to growing pigs or gestating sows
… gestating sows and growing pigs for STTD and retention of Ca and P. Two diets containing normal- or high-phytate were fed to growing pigs and gestating sows. Phytate level did not affect the STTD of Ca or Ca retention by gestating sows whereas the STTD of Ca and Ca and P retentions were …
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Effect of particle size on nutritional value of soybean meal for poultry
… metabolizable energy corrected to zero nitrogen retention (TMEn) and standardized amino acid digestibility in seven SBM samples that had a mean particle size of < 386, 466, 809, 1,174, 1,577, 2,026, or 2,321 μm. The TMEn of the SBMs were determined using conventional roosters while the …