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Title: Hydrological connectivity and ecological functional processes in inland floodplain wetlands: nutrient and carbon cycling
Authors: Wassens, S
Ralph, TJ
Ryder, DS
Saintilan, N
Mazumder, D
Wen, L
Hunter, S
Kobayashi, T
Keywords: Hydrology
Aquatic ecosystems
Carbon cycle
Issue Date: 3-Dec-2013
Publisher: Australian Society for Limnology
Citation: Kobayashi, T., Wassens, S., Ralph, T. J., Ryder, D. S., Saintilan, N., Mazumder, D., Wen, L., & Hunter, S. J. (2013 Hydrological connectivity and ecological functional processes in inland floodplain wetlands: nutrient and carbon cycling. Paper presented at the 52nd Australian Society for Limnology Congress University of Canberra, ACT., 2nd - 5th December 2013.
Abstract: Floodplain wetlands have intricate multi-channeled networks and unpredictable wet and dry phases related to variable hydrological regimes and geomorphic processes such as sedimentation and erosion. Hydrological reconnection of river channels with outer floodplain and wetland habitats initiates mobilisation and transformation of nutrients and carbon in inland floodplain wetlands. In this study, we aim to show habitat-dependent patterns of mobilisation and transformation of nutrients (total and dissolved nitrogen and phosphorus) and dissolved organic carbon (DOC) following environmental water releases, based on the available data from the Murrumbidgee Wetlands, Macquarie Marshes and Gwydir Wetlands. In general, concentrations of nutrients and DOC are lower within channels and higher on the floodplain and in wetlands where shallow inundation and mixing of topsoil with water occurs. Higher concentrations of nutrients and DOC on the floodplain represent a combination of supply from channels coupled with in situ releases from the water-soil interface. The volume, timing, depth, rate of rise and fall, and spatial distribution of water being introduced to floodplain wetlands influence the amount and distribution of nutrients and carbon in these systems. Rates of ecological functional processes such as primary productivity and respiration (or decomposition) are closely related to concentrations of nutrients and DOC. We propose a nutrient-DOC framework, combined with hydrological regimes and geomorphic processes, to better predict and understand the relationship between hydrological connectivity and ecological responses of inland floodplain wetlands. © The Authors
Gov't Doc #: 9609
Appears in Collections:Conference Publications

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