Woods Hole Oceanographic Institution

Amanda Spivak

»Evaluating Salt Marsh Ecosystem Restoration Across a 12-y Chronosequence
»Nutrient enrichment does not alter bacterial carbon sources
»Rapid carbon cycling by S. alterniflora
»Trophic history alters benthic processes
»Development of Plant and Soil Characteristics in Restored Mangrove Habitats
»Animating the Carbon Cycle
»Mesocosm scaling experiment
»Seagrass ecosystem metabolism
»Seagrass food web and nutrient field experiment
»Controls on community structure in eelgrass habitats
»Controls on SOM composition in eelgrass habitats
»Seagrass food webs affect SOM accumulation

Amanda C. Spivak, Kevin Kroeger, Meagan Gonneea, Jen O'Keefe, Jim Tang, Faming Wang, Evaluating Salt Marsh Ecosystem Restoration: Quantifying Soil Carbon Accumulation and Greenhouse Gas Emissions Across a 12-y Chronosequence, MIT Sea Grant, On going research

Salt marshes play a key role in the global carbon cycle and support a range of economically valuable ecosystem services. However, these ecosystems are under pressure globally from human activities that reduce marsh geographic extent as well as the ecological and biogeochemical functions that support ecosystem services. Massachusetts Division of Ecological Restoration, in collaboration with towns, agencies, and citizen groups, has restored salt marshes by removing culverts or similar structures that restricted tidal exchange between the marshes and Cape Cod Bay. Reduced tidal connectivity can lead to changes in marsh grass species composition, soil salinity and pH, soil decomposition rates and metabolic pathways, and emissions of greenhouse gases. Evaluating restoration efficacy is crucial but rarely undertaken. Our work addresses this knowledge gap by quantifying differences in soil carbon accumulation rates, pore water chemistry, and greenhouse gas fluxes across marshes where tidal connectivity has been restored. By comparing sites restored over multiple years we will be able to evaluate restoration trajectories and calculate rates of change in biogeochemical processes. Thus our results will provide watershed managers, towns, and agencies in Massachusetts with estimated recovery times and insight to how extensively biogeochemical functions are restored in sites where tidal restrictions have been repaired. (Supported by MIT Sea Grant:

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