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Drivers of Nutrient Retention in a S...

Evans, Jordan L.

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Drivers of Nutrient Retention in a Shallow Agricultural Lake.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Drivers of Nutrient Retention in a Shallow Agricultural Lake./
Author:	Evans, Jordan L.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	136 p.
Notes:	Source: Masters Abstracts International, Volume: 80-07.
Contained By:	Masters Abstracts International80-07.
Subject:	Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10980202
ISBN:	9780438807709

Drivers of Nutrient Retention in a Shallow Agricultural Lake.
Evans, Jordan L.

Drivers of Nutrient Retention in a Shallow Agricultural Lake. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 136 p.

Source: Masters Abstracts International, Volume: 80-07.

Thesis (M.S.)--Tennessee Technological University, 2018.

This item must not be sold to any third party vendors.

Many shallow oxbow lakes in northwest Mississippi are hypereutrophic due to nitrogen loading from agricultural fertilizer application. Shallow depth produces increased water temperatures and varied dissolved oxygen concentrations. Low oxygen, high nitrogen (N), and high temperature conditions create increased potential for nutrient removal via increased metabolism of bacteria. The objectives of this study are to determine spatial and temporal variations of nutrient retention and denitrification rates in the sediment of Roundaway Lake, Mississippi, focusing on the effects of water depth and temperature. Nutrient retention rates were measured in sediment cores collected across a depth gradient during three occasions in Spring 2017, during the time of year when nutrient loading is typically its highest, and incubated for 48 hours in flow-through cores. In Fall 2017, nutrient retention and denitrification (DNF) rates were measured in sediment cores exposed to experimental temperatures and dissolved organic carbon (DOC) concentrations for five days. Nitrate and phosphate retention rates were not significantly correlated to any water quality parameters measured, including water temperature and depth. Spatially, N uptake in sediments was greatest in the middle of the lake. Fall nutrient retention rates also showed no significant correlation with water temperature. However, DOC introduction increased N uptake across all temperatures. Denitrification rates increased with increasing temperature, and varied greatly with DOC additions. Negative denitrification rates observed in some cores suggests both DNF and N fixation were occurring in the lake sediment. Changes in water depth and temperature did not affect nutrient removal in this system during the spring. Lake depth-manipulations for irrigation that occur may not significantly alter nutrient removal processes of lake sediments.

ISBN: 9780438807709Subjects--Topical Terms:

516476
Ecology.

Drivers of Nutrient Retention in a Shallow Agricultural Lake.
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245 1 0 $a Drivers of Nutrient Retention in a Shallow Agricultural Lake.
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300 $a 136 p.
500 $a Source: Masters Abstracts International, Volume: 80-07.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Murdock, Justin N.
502 $a Thesis (M.S.)--Tennessee Technological University, 2018.
506 $a This item must not be sold to any third party vendors.
520 $a Many shallow oxbow lakes in northwest Mississippi are hypereutrophic due to nitrogen loading from agricultural fertilizer application. Shallow depth produces increased water temperatures and varied dissolved oxygen concentrations. Low oxygen, high nitrogen (N), and high temperature conditions create increased potential for nutrient removal via increased metabolism of bacteria. The objectives of this study are to determine spatial and temporal variations of nutrient retention and denitrification rates in the sediment of Roundaway Lake, Mississippi, focusing on the effects of water depth and temperature. Nutrient retention rates were measured in sediment cores collected across a depth gradient during three occasions in Spring 2017, during the time of year when nutrient loading is typically its highest, and incubated for 48 hours in flow-through cores. In Fall 2017, nutrient retention and denitrification (DNF) rates were measured in sediment cores exposed to experimental temperatures and dissolved organic carbon (DOC) concentrations for five days. Nitrate and phosphate retention rates were not significantly correlated to any water quality parameters measured, including water temperature and depth. Spatially, N uptake in sediments was greatest in the middle of the lake. Fall nutrient retention rates also showed no significant correlation with water temperature. However, DOC introduction increased N uptake across all temperatures. Denitrification rates increased with increasing temperature, and varied greatly with DOC additions. Negative denitrification rates observed in some cores suggests both DNF and N fixation were occurring in the lake sediment. Changes in water depth and temperature did not affect nutrient removal in this system during the spring. Lake depth-manipulations for irrigation that occur may not significantly alter nutrient removal processes of lake sediments.
590 $a School code: 0390.
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650 4 $a Aquatic sciences. $3 3174300
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