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- Title
Soil Carbon Dioxide Distribution and Flux within the Open‐top Chamber.
- Authors
Nakayama, F. S.; Kimball, B. A.
- Abstract
Open‐top chamber use for exposing plants to various levels of CO2 and pollutant gases is increasing in field studies. In making a C balance of cotton [Gossypium hirsutum (L.) 'Deltapine‐61'] for such a system, soil CO2 fluxes were observed to be significantly greater outside than inside the chamber. To find the cause, CO2 concentration was measured in the soil profile from 5‐ to 60‐cm depths of an Avondale clay loam [fine‐loamy, mixed (calcareous), hyperthermic Typic Torrifluvent]. The soil CO2 contents at the various depths sampled outside the chamber were higher than those inside the chamber. The differences in concentration were observable within 2 wk after the blower used to pass ambient of CO2‐enriched air through the chamber was turned on. The largest differences were present approximately 16 wk after the system had been in operation. Approximately 30 d was required for the soil CO2 levels inside and outside the chamber to become similar after the blower was turned off. Soil water content was not a factor causing this difference because it was nearly equal at both sites. Pressure differentials inside the growth chamber resulting from the blower operation could lead to a decrease in soil CO2 concentration and fluxes measured using the closed chamber technique.
- Publication
Agronomy Journal, 1988, Vol 80, Issue 3, p394
- ISSN
0002-1962
- Publication type
Article
- DOI
10.2134/agronj1988.00021962008000030003x