EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/20/2019 | 11:45 AM - 12:00 PM | CARBON DIOXIDE EFFLUX FROM ALPINE POND SOILS VARIES WITH SOIL NUTRIENT CONTENT AND HYDROLOGY | 151 DEF
CARBON DIOXIDE EFFLUX FROM ALPINE POND SOILS VARIES WITH SOIL NUTRIENT CONTENT AND HYDROLOGY
While inundated, small ponds (< 1000 m2 area) account for disproportionately large contributions of CO2 to the global carbon budget and also store carbon in anoxic soils. However, neither the rates of exposed pond soil CO2 efflux themselves nor the soil characteristics affecting those rates have been well studied, even though pond hydrology is shifting toward increasingly dry conditions in alpine and temperate zones. We analyzed soil CO2 efflux rates in dried soils of ponds of varying hydrology and soil characteristics at two locations near Rocky Mountain Biological Laboratory in Colorado. Average CO2 efflux rates from exposed soils were 43 times higher than average water CO2 efflux rates. Linear mixed effects models and PCA analysis showed that in addition to soil moisture and temperature, total dissolved nitrogen, total organic carbon, and nitrate concentrations were significant predictors of efflux. Soil organic matter content increased with decreasing drying frequencies toward pond centers. We conclude that total pond CO2 efflux will increase as pond hydroperiods become increasingly temporary, causing soils to become increasingly exposed.
- Carbon
- ClimateChange
- Sediment
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Presenters/Authors
Amanda DelVecchia
(), Duke University, amanda.delvecchia@duke.edu ;
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Steven Gougherty
(), Boston University, steven.gougherty@gmail.com;
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Brad Taylor
(), North Carolina State University Dept. of Applied Ecology; Rocky Mountain Biological Laboratory, bwtaylo3@ncsu.edu ;
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