David A. Stonestrom Guntram von Kiparski Corey R. Lawrence C.A. Masiello Arthur F. White John Fitzpatrick Marjorie S. Schulz 2011 <div id="aep-abstract-id15" class="abstract author" lang="en"><div id="aep-abstract-sec-id16"><p id="sp005">Concentrations of CO₂<span>&nbsp;</span>in soil atmosphere and CO₂<span>&nbsp;</span>efflux were measured across a marine terrace soil chronosequence near Santa Cruz, California. Soil development, specifically the formation of an argillic horizon, has created a two-tier soil gas profile in the older terrace soils. The soil above the argillic horizon has seasonal variations in soil CO₂<span>&nbsp;</span>associated with plant respiration. The older soils with dense argillic horizons maintain a year round ∼1%CO₂<span>&nbsp;</span>below the argillic horizon. The CO₂efflux during the growing season is higher on the older terraces.</p></div></div> application/pdf 10.1016/j.apgeochem.2011.03.048 en Elsevier Seasonal dynamics of CO2 profiles across a soil chronosequence, Santa Cruz, California article