| Soil Exchangeable Phosphorus Pools, Equilibrium Characteristics, and Mass Distribution Coefficients for Eight-Mile Run Watershed, Wisconsin |
Sep-2009 |
15 pages |
| Authors:
Zhonglong Zhang; Charles W Downer; Billy E Johnson; William F James; Aaron R Byrd; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
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 | This research experimentally determined phosphorus mass distribution coefficients (i.e., relationship between soil exchangeable and soluble phosphorus), exchangeable phosphorus pools, and soluble phosphorus in the interstitial water for soils exhibiting a range of phosphorus concentrations. The research also developed relationships between these variables and commonly measured, crop-available soil phosphorus for use in establishing initial soil P parameters in the System-Wide Water Resources Program-Nutrient Sub-Model (SWWRP-NSM). |
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| Nitrogen Cycling and Fate in a Floodplain Backwater of the Upper Mississippi River |
Sep-2009 |
16 pages |
| Authors:
William F James; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
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| Backwaters connected to large rivers efficiently retain nitrate and can play an important role in reducing downstream loading to coastal marine environments. However, biotic assimilation and transient storage can account for a significant portion of the nitrate uptake versus denitrification. The fate of this nitrogen (N) pool is largely unknown. Is assimilated nitrate stored temporarily and exported from the system later as another N species or is it eventually routed ... |
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| Sediment Equilibrium and Diffusive Fluxes in Relation to Phosphorus Dynamics in the Turbid Minnesota River |
Jan-2009 |
36 pages |
| Authors:
William F James; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| Much is known regarding the importance of surface and subsurface runoff from agricultural watersheds in the regulation of soluble phosphorus (P) concentration in large river systems. However, in-stream processes such as equilibrium P flux from suspended sediment and diffusive P flux from deposited sediment stored in river channels may also play a role in soluble P control. Ranges in equilibrium partitioning between aqueous and exchangeable particulate P pools associated with ... |
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| Environmental Factors Affecting Aquatic Plant Growth Potential in Marinuka Lake, Wisconsin |
Dec-2008 |
14 pages |
| Authors:
William F James; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
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| Submersed aquatic macrophytes play an important role in stabilizing sediment from resuspension, sequestering nutrients, and reducing algal growth in shallow lakes. Loss of vegetation is usually accompanied by changes in stable state to one characterized by higher turbidity, low light penetration, and frequent noxious algal blooms. Aquatic vegetation once played an important role in stabilizing the sediment and providing important fish and water fowl habitat in Marinuka Lake, Wisconsin. However, ... |
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