Soil CO2 efflux is a major contributor of CO2 to the atmosphere. The rate that CO2 is respired out of the soil is called the soil flux (Fs). Many variables alter Fs. These variables differ drastically in the variety of ecosystems found on the earth. It is important to understand how Fs functions in each ecosystem so future concentrations of CO2 in the atmosphere can be better understood. I studied Fs and its relationship to soil temperature, predawn soil water potential, and aboveground biomass in four ecosystems across the climatic gradient found in the Oregon transect for terrestrial ecological research (OTTER). I found strong relationships between Fs and temperature at the spruce and Douglas-fir sites, and no significant relationship between Fs and temperature at the pine and juniper sites in 2000. Initial water potential data show a relationship with Fs, but more work needs to be done to document it.
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