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Characterization, mobility, and fate...

Osborne, Todd Z.

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Characterization, mobility, and fate of dissolved organic carbon in a wetland ecosystem.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Characterization, mobility, and fate of dissolved organic carbon in a wetland ecosystem./
作者:	Osborne, Todd Z.
面頁冊數:	179 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3011.
Contained By:	Dissertation Abstracts International66-06B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3178015
ISBN:	9780542178399

Characterization, mobility, and fate of dissolved organic carbon in a wetland ecosystem.
Osborne, Todd Z.

Characterization, mobility, and fate of dissolved organic carbon in a wetland ecosystem. - 179 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3011.

Thesis (Ph.D.)--University of Florida, 2005.

Many investigations into the function of dissolved organic matter (DOM) in wetland and aquatic ecosystems have demonstrated that it is of great ecological significance. However, investigations of DOM derived from wetland vegetation have received little attention, even though these plant communities can be a dominant source of DOM. The goals of this research were to investigate DOM derived from different plant species commonly found in wetlands to determine if differences existed among species in the characteristics of DOM and its reactivity to abiotic and biotic degradation, and if plant communities influence dissolved organic carbon (DOC) at the field scale.

ISBN: 9780542178399Subjects--Topical Terms:

545717
Biogeochemistry.

Characterization, mobility, and fate of dissolved organic carbon in a wetland ecosystem.
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245 1 0 $a Characterization, mobility, and fate of dissolved organic carbon in a wetland ecosystem.
300 $a 179 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3011.
500 $a Chair: K. R. Reddy.
502 $a Thesis (Ph.D.)--University of Florida, 2005.
520 $a Many investigations into the function of dissolved organic matter (DOM) in wetland and aquatic ecosystems have demonstrated that it is of great ecological significance. However, investigations of DOM derived from wetland vegetation have received little attention, even though these plant communities can be a dominant source of DOM. The goals of this research were to investigate DOM derived from different plant species commonly found in wetlands to determine if differences existed among species in the characteristics of DOM and its reactivity to abiotic and biotic degradation, and if plant communities influence dissolved organic carbon (DOC) at the field scale.
520 $a Chemical and physical characterization of both plant tissue and DOM from these detrital materials revealed significant differences among species with respect to DOM nutrient content, molecular weight fractionation, carbohydrates, polyphenols, protein, and leaching potential. Fiber fractions and ratios of nutrients were correlated between plant tissue and derived DOM.
520 $a Microbial decomposition experiments resulted in significantly different rates and total losses of carbon from the DOM samples. Results suggest that DOM, derived from different plants reacts differently to microbial degradation. Total phenolic content and DOM in the molecular weight fraction of one to three kilodaltons explained 86% of the variability (multiple regression analysis) in the observed loss of carbon during decomposition.
520 $a Photolytic mineralization of DOC was found to be significantly different among groups of species in UV exposure experiments. Phenolic content was correlated with changes in specific absorbance at 254 nm, indicating loss of aromatic and hydrophobic structure. Photo-bleaching, measured by loss of absorbance at 325 nm, was correlated (r2 = 0.65) with phenolic compound content in DOM samples, but results suggest that other compounds are contributing to photolysis losses of carbon.
520 $a Surface water samples collected from 1283 sites in the Everglades were analyzed for DOC, with values ranging from 4.4 to 83.8 mg C L-1 . Results of spatial analyses suggest an influence of canal inputs of DOC into the northern Everglades. The observed gradient in DOC suggests that most DOC is consumed within the Everglades. Comparisons of mean DOC concentrations within plant communities and ecotypes were significantly different suggesting that these inputs influence DOC dynamics. Results of all experiments suggest that DOM characteristics (and thus reactivity) can be source species dependant. Further, the role of plant communities in DOM cycling warrants further investigation.
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650 4 $a Biology, Limnology. $3 1018638
650 4 $a Agriculture, Soil Science. $3 1017824
650 4 $a Biology, Ecology. $3 1017726
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773 0 $t Dissertation Abstracts International $g 66-06B.
790 1 0 $a Reddy, K. R., $e advisor
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