Glass domes with adjustable windows: A novel technique for exposing juvenile forest stands to evaluated CO2 concentration
2001
Urban, O. | Janous, D. | Pokorny, R. | Pavelka, M. | Fojtik, Z. | Sprtova, M. | Marek, M.V. (Akademie Ved, Brno (Czech Republic). Ustav Krajinne Ekologie) | Markova, I. | Kalina, J.
We present a new technological approach for in situ investigation of long-term impacts of elevated CO2 concentration (EC) on juvenile forests characterised by an intensive community level and canopy closure phase. Construction of the glass domes is based on the properties of earlier tested open-top chambers (OTCs). An air climatisation device together with an adjustable window system, that forms the shell cover of the domes, is able to keep the required [CO2] in both time and spatial scales with the relatively small consumption of supplied CO2. This is achieved by half closing the win-dows on the windward side. We evidenced good coupling of treated trees to the atmosphere, including mutual interactions among trees. The semi-open design of the domes moderates the prablems of strong wind, humidity, and temperature gradients associated with OTCs. The dimensions of the domes are l0 x 10 m in length and 7 m high in the central part. The experiment was done in three identical stands of twelve-year-old Norway spruce trees.
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