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Dissolved carbon, greenhouse gases, and δ 13 C dynamics in four estuaries across a land use gradient

journal contribution
posted on 2019-01-01, 00:00 authored by A Looman, I R Santos, D R Tait, Jackie Webb, C Holloway, D T Maher
Land use is a well known driver of nutrient dynamics in estuaries, however less is known about how land use may influence the coastal carbon (C) cycle. Here, we report dissolved carbon concentrations, δ13C isotopic signatures, and water–air CO2 and CH4 fluxes for four Australian estuaries with contrasting catchment land use ranging from 9 to 72% natural. Water samples were collected during dry and wet hydrologic extremes. Dissolved organic carbon (DOC) concentrations were highest and total dissolved nitrogen and dissolved phosphorous were lowest in the least impacted estuary (Pine Creek). The DOC δ13C signature was enriched for the estuary with 91% urban-agricultural land use (Coffs Creek), implying a shift in the source of DOC along the land use gradient. Low DOC and high nutrient availability decreased CO2 fluxes to the atmosphere in the impacted systems during both wet and dry conditions, and increased CH4 concentrations and fluxes during the wet conditions. Variability of CO2 and CH4 were influenced by multiple drivers including hydrologic forcing, dissolved nutrients, as well as shifts in the nature of allochthonous versus autochthonous sources within each estuary.

History

Journal

Aquatic Sciences

Volume

81

Article number

22

Pagination

1 - 15

Publisher

Springer

Location

Berlin, Germany

ISSN

1015-1621

eISSN

1420-9055

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

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