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Belowground carbon allocation
Belowground carbon allocation
We developed a conceptual model that allows the estimation of belowground carbon allocation at high temporal resolution (monthly to seasonal), and are currently testing its performance in different ecosystems.
Conceptual model of carbon flows in the plant-soil system
Conceptual model of carbon pools and flows in the Temporally Integrating Mass Balance Carbon Allocation (TIMBCA) model
Aerodyne Tunable Infrared Laser Direct Absorption Spectroscope at the Davy Crockett National Forest flux site
Continuous soil CO2 efflux measurements
Tissue sampling for non-structural carbon analyses
The effect of prescribed burning frequency on soil carbon stock and annual carbon balance
The effect of prescribed burning frequency on soil carbon stock and annual carbon balance
Many pine forests in the Southern USA are burned regularly for managing the fuel load and reducing the risk of wildfires, as well as for managing the habitat for some wildlife species, like the endangered red-cockaded woodpecker.
Loblolly and shortleaf pine stand that has not been burned for over 20 years
Loblolly and shortleaf pine stand that has not been burned for over 20 years
Shortleaf and loblolly pine stand that has been burned every 3-5 years, and most recently about 3 months prior
Shortleaf and loblolly pine stand that has been burned annually for over 20 years
Management and land use change effects on soil carbon dynamics
Management and land use change effects on soil carbon dynamics
Soil carbon content correlates with its water and nutrient holding capacities, biodiversity, and ultimately what is called “soil health”. In both forests and rangelands, progressive management techniques are considered those that preserve or build soil carbon stock.
Longleaf pine at Jones Ecological Research Center in GA. (Photo by R. Bryant)
Loblolly pine plantation in coastal North Carolina after mid-rotation thinning
Fire-managed shortleaf pine in Davy Crockett National Forest, TX
Coarse root decomposition
Coarse root decomposition
The relative importance of coarse roots to long-lived soil carbon remains unclear. Anecdotal evidence of intact old roots in the soil does not fit with published decomposition constants and the chemical evidence suggesting that the majority of “old” soil carbon consisting of fungal
Coarse root and stem samples for burying in the “deep” pits (50 cm)
Soil pits for burying coarse root and stem sections
Closed soil pits, with collars installed above select samples for soil CO2 efflux measurements
Seasonality or phenology of ecosystem processes
Seasonality or phenology of ecosystem processes
Net ecosystem fluxes of carbon and water are sums of multiple individual processes, each with potentially different environmental responses. We quantify the seasonality of a number of sub-processes to better validate the seasonality of ecosystem models.
Cover image of the book “Phenology of Ecosystem Processes“
Flux seasonality metrics (Yang & Noormets 2021)
External project web pages
External project web pages
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