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Control of Phosphorus Dynamics Between Groundwater, Surface Water, and Soil Compartments in a Montane Tropical Watershed.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Control of Phosphorus Dynamics Between Groundwater, Surface Water, and Soil Compartments in a Montane Tropical Watershed./
Author:	Hoyt, Virginia A.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
Description:	82 p.
Notes:	Source: Masters Abstracts International, Volume: 83-02.
Contained By:	Masters Abstracts International83-02.
Subject:	Biogeochemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28497375
ISBN:	9798516964916

Control of Phosphorus Dynamics Between Groundwater, Surface Water, and Soil Compartments in a Montane Tropical Watershed.
Hoyt, Virginia A.

Control of Phosphorus Dynamics Between Groundwater, Surface Water, and Soil Compartments in a Montane Tropical Watershed. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 82 p.

Source: Masters Abstracts International, Volume: 83-02.

Thesis (M.S.)--University of New Hampshire, 2021.

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

Surface, subsurface, and soil water chemistry of a tropical river system was studied to better understand how ecosystem compartments along hydrologic flowpaths control phosphorus dynamics, what factors control downstream phosphorus trends, and what factors account for spatial variability in PO4 concentrations in a tropical montane watershed. Interactions between ecosystem compartments and changes in the global nitrogen cycle have been well- documented and described, but much less is known in this regard about the global phosphorus [P] cycle. To enhance our understanding of interactions between ecosystem compartments, longitudinal P variability, P-processing at the interfaces, and P-cycling, I conducted a series of observations and experiments in the Icacos watershed of the Luquillo Critical Zone Observatory in Puerto Rico. Batch soil sorption experiments were used to document PO4 sorption along a riparian catena, a series of stream PO4 additions documented uptake into stream sediments from the overlying water column, and longitudinal stream transects of PO4 and the metals (Ca, Al, Fe, Mn, Mg) that may play a role in PO4 retention in stream samples were conducted to assess controls on PO4 concentrations.Results provide insight on downstream trends in PO4, spatial variability of PO4, and overall control of P nutrient dynamics in a tropical montane watershed. PO4 fraction size analysis suggests dissolved PO4 (.2,.45,<.7 µm) is captured and immobilized by bed material, and the fine colloidal fraction persists in downstream export. Stream water and groundwater chemistry suggests losses to groundwater along reaches. Soils observations and studies suggest variation in Icacos soils and evidence of highly oxidized Al- and Fe- oxide patches as one moves away from riparian areas and further in proximity of the reaches and/or further upstream in reaches. Batch soil experiments provide substantial insight on PO4 enrichment and C-Q relationships. High infiltration rates observed in the Icacos watershed in tandem with unique increasing PO4 C-Q relationships and soil sorption results suggest during times of rainfall that soils provide significant enrichment of PO4 to streams.

ISBN: 9798516964916Subjects--Topical Terms:

545717
Biogeochemistry.
Subjects--Index Terms:

Biogeochemical cycle

Control of Phosphorus Dynamics Between Groundwater, Surface Water, and Soil Compartments in a Montane Tropical Watershed.
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245 1 0 $a Control of Phosphorus Dynamics Between Groundwater, Surface Water, and Soil Compartments in a Montane Tropical Watershed.
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300 $a 82 p.
500 $a Source: Masters Abstracts International, Volume: 83-02.
500 $a Advisor: McDowell, William H.
502 $a Thesis (M.S.)--University of New Hampshire, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Surface, subsurface, and soil water chemistry of a tropical river system was studied to better understand how ecosystem compartments along hydrologic flowpaths control phosphorus dynamics, what factors control downstream phosphorus trends, and what factors account for spatial variability in PO4 concentrations in a tropical montane watershed. Interactions between ecosystem compartments and changes in the global nitrogen cycle have been well- documented and described, but much less is known in this regard about the global phosphorus [P] cycle. To enhance our understanding of interactions between ecosystem compartments, longitudinal P variability, P-processing at the interfaces, and P-cycling, I conducted a series of observations and experiments in the Icacos watershed of the Luquillo Critical Zone Observatory in Puerto Rico. Batch soil sorption experiments were used to document PO4 sorption along a riparian catena, a series of stream PO4 additions documented uptake into stream sediments from the overlying water column, and longitudinal stream transects of PO4 and the metals (Ca, Al, Fe, Mn, Mg) that may play a role in PO4 retention in stream samples were conducted to assess controls on PO4 concentrations.Results provide insight on downstream trends in PO4, spatial variability of PO4, and overall control of P nutrient dynamics in a tropical montane watershed. PO4 fraction size analysis suggests dissolved PO4 (.2,.45,<.7 µm) is captured and immobilized by bed material, and the fine colloidal fraction persists in downstream export. Stream water and groundwater chemistry suggests losses to groundwater along reaches. Soils observations and studies suggest variation in Icacos soils and evidence of highly oxidized Al- and Fe- oxide patches as one moves away from riparian areas and further in proximity of the reaches and/or further upstream in reaches. Batch soil experiments provide substantial insight on PO4 enrichment and C-Q relationships. High infiltration rates observed in the Icacos watershed in tandem with unique increasing PO4 C-Q relationships and soil sorption results suggest during times of rainfall that soils provide significant enrichment of PO4 to streams.
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650 4 $a Biogeochemistry. $3 545717
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Ecology. $3 516476
650 4 $a Minerals. $3 542841
650 4 $a Acids. $3 922327
650 4 $a Clay. $3 537738
650 4 $a Trends. $3 3560051
650 4 $a Soil erosion. $3 602940
650 4 $a Adsorption. $3 580046
650 4 $a Aluminum. $3 735071
650 4 $a Chemistry. $3 516420
650 4 $a Sediments. $3 3566210
650 4 $a Hydrology. $3 545716
650 4 $a Forests. $3 3560105
650 4 $a Phosphates. $3 567123
650 4 $a Aquatic ecosystems. $3 3560371
650 4 $a Climate change. $2 bicssc $3 2079509
650 4 $a Aquifers. $3 551140
650 4 $a Bioavailability. $3 875104
650 4 $a Nitrogen. $3 1314426
650 4 $a Eutrophication. $3 896350
650 4 $a Creeks & streams. $3 3685269
650 4 $a Geomorphology. $3 542703
650 4 $a Groundwater. $3 566494
650 4 $a Experiments. $3 525909
650 4 $a Carbon. $3 604057
650 4 $a Watersheds. $3 544815
653 $a Biogeochemical cycle
653 $a Montane
653 $a Nutrient cycling
653 $a Phosphorus
653 $a Sorption
653 $a Ttropical
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