Turnover of wetland sediments on mineralization of carbon, nitrogen and phosphorus Qingren Wang* and Yuncong Li Tropical Research and Education Center.

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Presentation transcript:

Turnover of wetland sediments on mineralization of carbon, nitrogen and phosphorus Qingren Wang* and Yuncong Li Tropical Research and Education Center Department of Soil and Water Science IFAS, University of Florida ASA-CSSA-SSSA 2009, Pittsburgh, PA

Outline Brief introduction about the Everglades wetland Recycling of carbon in wetland system Experiment setup, sampling and analysis Results, conclusion and discussion

TREC-Homestead

Florida Bay Natural ecosystem National Park Eco-Environment in south Florida Agriculture

Natural Eco-environment in the Everglades wetland Bulrush: Scirpus rubiginosus Sawgrass: Cladium jamaicense

Wetlands are an important part of the global carbon inventory: up to 1/3 of total global soil carbon is stored in wetlands Carbon in wetlands is relatively stable Carbon accumulation is based on vegetation types and soil fertility Decomposition rate depends on water content and temperature Why carbon in wetlands?

Importance of wetlands Mitra et al, 2005, Curr. Sci.

Chauhan, 2007: methanogenic-associations-in-florida-wetlands Carbon cycling in wetlands

Hypothesis Sediment mineralization was dependant on vegetation type and temperature at the same moisture and other conditions

Experiment Intact sediment columns were collected from wetland sites with two different main vegetations: Bulrush and Sawgrass (both are native plants). Kept these columns in three growth chambers with temperature at: 30, 25, and 20 o C, respectively. Carbon emission and nutrient mineralization were monitored through sampling without disturbing the sediments for 380 days.

Sediment collection & experiment setup

Sample analyses Carbon analysis: LiquiTOC Nitrate and ammonium: Seal AQ2+ Ortho phosphorus: Auto- analyzer (AA-3)

Turnover of sediments for C, N, and P with time. Sediment mineralization vs. vegetation type. Effect of temperature on sediment turnover. Major results

Carbon mineralization rate

Accumulative CO 2 -C with time

Expressed by exponential growth model SawgrassBulrush a b R2R y = a * Exp(-bx) x-time (days), and y-accumulative amount of CO 2 -C released from sediments

Impacted by temperature (CO 2 –C) Temperature ( o C)

Nitrogen mineralization Time (day)

Accumulative N Time (day)

Phosphorus mineralization

Accumulative phosphorus

Impacted by temperature (NO 3 –N) Temperature ( o C)

Impacted by temperature (NH 4 -N) Temperature ( o C)

Impacted by temperature (P) Temperature ( o C)

Conclusions (1) The turnover of organic C was rapid in the first 100 days. The accumulative amount of C mineralized can be well described by an exponential growth model. Nitrogen turnover was low at first 100 days and sharply increased afterwards. Phosphorus mineralization was low throughout the whole experimental period.

Conclusions (2) Sawgrass had a greater turnover on C and N but lower on P than did bulrush. High temperature improves the turnover of organic C and NH 4 -N for both species but that of P only for bulrush. The turnover of NO 3 -N was the greatest at 25 o C, especially for sawgrass. Factors in controlling the turnovers are rather complicated, C:N ratio (18.9 in sawgrass vs in bulrush) might be one of them.