Collaborations and Partnerships
Lead: Tully (UMD). Co-Leads: Chin (UD) and Seyfferth (UD)
Overview: Slow and fast hydrological processes will change soil and water salinity and redox conditions that will alter nutrient (e.g., phosphorus [P] and nitrogen [N]) and C stores, composition and fluxes at the marsh-upland transition. Differing rates and persistence of inundated and saline conditions due to fast and slow hydrologic processes will affect cycling of redox-active elements (e.g., iron [Fe] and sulfur [S]), organo-mineral assemblages, and mineral-nutrient stability in soils and sediments. If C and P are associated with poorly crystalline Fe minerals, they are more susceptible to leaving the systems upon flooding due to redox changes. Inundation will cause flushing of C, N, and P from the system, which is exacerbated with increases in salinity. Further, the dominant biogeochemical processes will differ between marsh-forested and marsh-agricultural transitions within the CZ. It is unknown how the hydrological dynamics and water chemistry will alter C mobilization/sequestration in marsh-forest and marsh-agriculture transition zones. A primary objective is to determine which key hydrological and biogeochemical factors influence soil organic carbon (SOC) loss or sequestration.
Team Management Plan: Hypothesis 3 leads, will convey the experimental tasks, responsibilities, and schedules as laid out in the strategic implementation plan to all team members. Teams will meet quarterly. Sub-project meetings will be held as needed. Annual assessments of progress toward goals and milestones will be compared to the strategic implementation plan. Any alterations will be made.
Objective: We will determine how changes in salinity and redox conditions tied to fast and slow processes will affect N, P, and C composition, lability, and the sequestration potential of marsh-forest and marsh-agricultural soils?