Details:

Journal Title:
Science of The Total Environment
Personal Author:
Villa, Jorge A. ; Ju, Yang ; Yazbeck, Theresia ; Waldo, Sarah ; Wrighton, Kelly C. ; ... More +
Villa, Jorge A. ; Ju, Yang ; Yazbeck, Theresia ; Waldo, Sarah ; Wrighton, Kelly C. ; Bohrer, Gil Less -
NOAA Program & Office:
NOAA General Documents
Description:
Measurements of the spatial heterogeneity of methane fluxes in wetlands are critical to better understand and predict methane emissions at the ecosystem scale. However, the within-wetland spatial heterogeneity of fluxes is rarely assessed. Here, we use a spatially balanced rapid chamber-based survey of methane at different ecohydrological patches within a temperate freshwater marsh. We measured fluxes exclusively from the water surface without including vegetation. We further used the data from chamber measurements to partition diffusive and ebullitive fluxes. Three ecohydrological patches were distinguishable in the marsh, defined by the type and presence/absence of vegetation. These patches were emergent vegetation, floating-leaved, and open water. Net methane fluxes from the water surface (diffusion plus ebullition) in emergent vegetation patches were larger than in the floating-leaved vegetation and open water patches (p < 0.05). Diffusive fluxes, representing a sizable smaller fraction of net fluxes, were larger in vegetated than in unvegetated patches (p < 0.05), while ebullitive fluxes mirrored the magnitude and differences observed in the net fluxes. Moreover, pooled net and ebullitive fluxes across patches (but not diffusive fluxes) were negatively correlated with water levels, the primary variable affecting patch distribution. Altogether, our results indicate that the differences among ecohydrological patches are driven by ebullition, ultimately highlighting challenges faced by scientists and practitioners in the field and modelers seeking to improve the predictability and resolution of wetland biogeochemical models.
Keywords:
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Environmental Chemistry Environmental Engineering Pollution Waste Management And Disposal
Source:
Science of The Total Environment, 767, 144498
DOI:
https://doi.org/10.1016/j.scitotenv.2020.144498
ISSN:
0048-9697
Format:
PDF
Publisher:
Elsevier BV
Document Type:
Journal Article
Rights Information:
Accepted Manuscript
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:590b7dee2245c0446b9254a54a6293318de086c8d4591b640496516b724b582e
Download URL:
https://repository.library.noaa.gov/view/noaa/57601/noaa_57601_DS1.pdf
File Type:

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