Planktonic primary productivity and respiration in inland floodplain wetlands

patterns and relationships with trophic conditions and organic matter concentrations differ between channel and non-channel habitats

T. Kobayashi, J. A. Iles, T. J. Ralph, S. J. Hunter

    Research output: Chapter in Book/Report/Conference proceedingConference abstract

    42 Citations (Scopus)

    Abstract

    Planktonic processes are part of carbon cycling and transformation in inundated inland floodplain wetlands. However, quantitative measurements of planktonic process rates are rare. We measured planktonic gross primary productivity (GPP) and respiration (PR) in channel and non-channel habitats (marshes, swamps, waterholes and a floodplain lake) in inland floodplain wetlands of New South Wales, Australia. The rates were modeled as a function of total nitrogen (TN), total phosphorus (TP), and dissolved organic carbon (DOC). TN and TP are a measure of trophic conditions and DOC as a measure of organic matter concentrations. The GPP varied from 3.7-405.4 mgC m-3 h-1 (mean±standard error: 89.4±9.2 mgC m-3 h-1, n=81), PR from 1.5-251.6 mgC m-3 h-1 (43.2±5.66 mgC m-3 h-1 , n=81), TN from 682.0-14700.0 mg m-3 (2643.0±241.6 mg m-3, n=81), TP from 47.9-1405.0 mg m-3 (316.8±31.4 mg m-3, n=81), and DOC from 1.9-46.3 g m-3 (21.8±1.6 g m-3, n=81). We found that our models of trophic conditions and organic matter concentrations predicted GPP and GPP/PR ratio in channel habitats as a function of DOC; and GPP, PR and GPP/PR in non-channel habitats as a function of TN and/or TP. The ‘best’ predictive models explained between 46-74% of the variation in channel habitats and between 16-87% of the variation in non-channel habitats. We discuss the need to further refine our models that predict GPP and PR to better understand and assess wetland carbon balances during inundation.
    Original languageEnglish
    Title of host publicationASL 50th annual congress with NZFSS
    Subtitle of host publicationdelegate handbook
    PublisherAustralian Society for Limnology
    Pages98
    Number of pages1
    Publication statusPublished - 26 Sep 2011
    EventASL and NZFSS joint congress (50th : 2011) - Brisbane, Australia
    Duration: 26 Sep 201130 Sep 2011

    Conference

    ConferenceASL and NZFSS joint congress (50th : 2011)
    CountryAustralia
    CityBrisbane
    Period26/09/1130/09/11

    Fingerprint Dive into the research topics of 'Planktonic primary productivity and respiration in inland floodplain wetlands: patterns and relationships with trophic conditions and organic matter concentrations differ between channel and non-channel habitats'. Together they form a unique fingerprint.

  • Cite this

    Kobayashi, T., Iles, J. A., Ralph, T. J., & Hunter, S. J. (2011). Planktonic primary productivity and respiration in inland floodplain wetlands: patterns and relationships with trophic conditions and organic matter concentrations differ between channel and non-channel habitats. In ASL 50th annual congress with NZFSS: delegate handbook (pp. 98). Australian Society for Limnology.