Belowground Carbon Cycling at Aspen FACE
Dynamic Responses to CO2 and O3 in Developing Forests
Kurt S. Pregitzer1 and Alan F. Talhelm, College of Natural Resources, University of Idaho, Moscow, Idaho, USA 1Corresponding author: e-mail: kpregitzer@uidaho.edu
Abstract
The Aspen free-air carbon dioxide (CO2) enrichment (FACE) experiment tested how three developing forest communities responded to elevated concentrations of CO2 and/or tropospheric ozone (O3). Throughout the 11-year experiment, elevated CO2 increased aboveground productivity, whereas the initial negative effects of elevated O3 on aboveground productivity became insignificant over time. During the first 2 years, fine root biomass and soil respiration responded positively ...
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