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- Title
Performance of Low-Cost Open-Top Chambers to Study Long-Term Effects of Carbon Dioxide and Climate under Field Conditions.
- Authors
Messerli, Jonathan; Bertrand, Annick; Bourassa, Josée; Bélanger, Gilles; Castonguay, Yves; Tremblay, Gaëtan; Baron, Vern; Seguin, Philippe
- Abstract
The increase in atmospheric carbon dioxide concentration ([CO2]) and consequent increase in air temperature is expected to have significant effects on plant growth and nutritive value. Studies examining the effects of elevated [CO2] on plants under field conditions have been limited by the inherent difficulty to modify air composition in open air. Here we describe an efficient and inexpensive open-top chamber (OTC) system designed to study the effects of elevated atmospheric [CO2] and temperature on perennial alfalfa-timothy (Medicago sativa L.)--(Phleumpratense L.) mixture. The design and construction of these OTCs are described in detail, along with cost estimation for each component. Eight OTCs, each with 1.2 m² of ground area (four with elevated [CO2] and four with ambient [CO2]) were fabricated and four control plots of the same dimension were established to assess the chamber effects on plant responses to CC2. The [CO2] in elevated-CO2 chambers fell 93% of the time within ±20% of the targeted 600 µmol mol-1 CO2, based on 10 min averages. The CO2 consumption in elevated-CO2 chambers averaged 3.0 kg CO2 m² d-1. To ensure that the environment within OTCs was similar to the surrounding field, growing conditions were determined in all chambers and control plots. Adequate light transmission was observed compared to control plots (93%) and the temperature increase was 0.7°C on average. After two growing seasons of continued use, this system has proven its effectiveness for studying the effects of CO2 and climate change in the field at low cost.
- Subjects
EFFECT of carbon dioxide on plants; VEGETATION &; climate; ATMOSPHERIC temperature research; GROWTH cabinets &; rooms; AGRONOMY
- Publication
Agronomy Journal, 2015, Vol 107, Issue 3, p916
- ISSN
0002-1962
- Publication type
Article
- DOI
10.2134/agronj14.0571