Changes in concentration and composition of dissolved and particulate organic matter in the upper San Pedro River, Arizona, in response to changes in flow regime

Persistent Link:
http://hdl.handle.net/10150/191372
Title:
Changes in concentration and composition of dissolved and particulate organic matter in the upper San Pedro River, Arizona, in response to changes in flow regime
Author:
Haas, Peter Andrew.
Issue Date:
2003
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
This study presents the results of 15 months of intensive sampling of the upper San Pedro River at the Boquillas ranch research site. Sampling identified patterns in surface water chemistry associated with seasonal changes in flow regime. The source of organic matter shifted from highly aquatic to highly terrestrial during the monsoon season. Concentrations of Dissolved Organic Carbon (DOC) increased from a nonmonsoon baseflow median of 2.7 ± 0.1 mg/I to a median monsoon baseflow concentration of 3.3 ± 0.2 mg/l. DOC concentrations during flow events were significantly higher (p < 0.05) with a median peak concentration of 7.2 ± 0.4 mg/l. Concentrations of Dissolved Organic Nitrogen (DON) increased from a non-monsoon baseflow median of 0.10 ± 0.01 mg/1 to a median monsoon baseflow concentration of 0.16 ± 0.01 mg/l. DON concentrations during flow events were significantly higher (p < 0.05) with a median peak concentration of 0.48 ± 0.02 mg/l. The 59-day 2002 monsoon contributed 40% of the water volume while transporting nearly 50% of the Dissolved Organic Matter (DOM) and 99% of the Particulate Organic Matter (POM) for the 2002 water year. Annual rates of production were estimated for DOC between 0.008 and 0.0012 g C m^-2yr^-1 and Particulate Organic Carbon (POC) between 0.07 and 0.11 g C m^2 yr^-1 , as well as, DON between 0.00024 and 0.00036 g N m^-2 yr^-1 and Particulate Organic Nitrogen (PON) between 0.004 and 0.006 g N m^-2 yr^-1 . Flux rates were much lower than that of mesic systems and likely reflects the lower terrestrial net primary productivity of the desert environment and below average precipitation during the 2002 water year.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Water -- Composition -- Arizona -- Pinal County.; Streamflow -- San Pedro River (Mexico and Ariz.)
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Hydrology and Water Resources; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Brooks, Paul D.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleChanges in concentration and composition of dissolved and particulate organic matter in the upper San Pedro River, Arizona, in response to changes in flow regimeen_US
dc.creatorHaas, Peter Andrew.en_US
dc.contributor.authorHaas, Peter Andrew.en_US
dc.date.issued2003en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThis study presents the results of 15 months of intensive sampling of the upper San Pedro River at the Boquillas ranch research site. Sampling identified patterns in surface water chemistry associated with seasonal changes in flow regime. The source of organic matter shifted from highly aquatic to highly terrestrial during the monsoon season. Concentrations of Dissolved Organic Carbon (DOC) increased from a nonmonsoon baseflow median of 2.7 ± 0.1 mg/I to a median monsoon baseflow concentration of 3.3 ± 0.2 mg/l. DOC concentrations during flow events were significantly higher (p < 0.05) with a median peak concentration of 7.2 ± 0.4 mg/l. Concentrations of Dissolved Organic Nitrogen (DON) increased from a non-monsoon baseflow median of 0.10 ± 0.01 mg/1 to a median monsoon baseflow concentration of 0.16 ± 0.01 mg/l. DON concentrations during flow events were significantly higher (p < 0.05) with a median peak concentration of 0.48 ± 0.02 mg/l. The 59-day 2002 monsoon contributed 40% of the water volume while transporting nearly 50% of the Dissolved Organic Matter (DOM) and 99% of the Particulate Organic Matter (POM) for the 2002 water year. Annual rates of production were estimated for DOC between 0.008 and 0.0012 g C m^-2yr^-1 and Particulate Organic Carbon (POC) between 0.07 and 0.11 g C m^2 yr^-1 , as well as, DON between 0.00024 and 0.00036 g N m^-2 yr^-1 and Particulate Organic Nitrogen (PON) between 0.004 and 0.006 g N m^-2 yr^-1 . Flux rates were much lower than that of mesic systems and likely reflects the lower terrestrial net primary productivity of the desert environment and below average precipitation during the 2002 water year.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshWater -- Composition -- Arizona -- Pinal County.en_US
dc.subject.lcshStreamflow -- San Pedro River (Mexico and Ariz.)en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineHydrology and Water Resourcesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairBrooks, Paul D.en_US
dc.identifier.oclc219665266en_US
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