Long-term Climate Change Research Facility for Trees: CO₂-Enriched Open Top Chamber System
2012
Lee, J.C., Korea Forest Research Institute, Suwon, Republic of Korea | Kim, D.H., Korea Forest Research Institute, Suwon, Republic of Korea | Kim, G.N., Korea Forest Research Institute, Suwon, Republic of Korea | Kim, P.G., Kyungpook National University, Sangju, Republic of Korea | Han, S.H., Korea Forest Research Institute, Suwon, Republic of Korea
The open-top chamber (OTC) system is designed for long term studies on the climate change impact on the major tree species and their community in Korea. In Korea Forest Research Institute (KFRI), the modified OTC system has been operating since September 2009. The OTC facility consists of six decagon chambers (10 meters in diameter by 7 meters high) with controlled gas concentration. In each chamber, a series of vertical vent pipes are installed to disperse carbon dioxide or normal air into the center of the chamber. The OTC is equipped with remote controlled computer system in order to maintain a stable and elevated concentration of carbon dioxide in the chamber throughout the experimental period. The experiment consisted of 4 treatments: two elevated CO₂ levels (1.4x and 1.8x ambient CO₂) and two controls (inside and outdoors of the OTC). Average operational rate was the lowest (94.2%) in June 2010 but increased to 98% in July 2010 and was 100% during January to December 2011. In 2010~2011, CO₂ concentrations inside the OTCs reached the target programmed values, and have been maintained stable in 2011. In 2011, CO₂ concentrations of 106%, 100% and 94% of target values has been recorded in control OTC, 1.4x CO₂-enriched OTC and 1.8x CO₂-enriched OTC, respectively. With all OTC chambers, the difference between outside and inside temperatures was the highest (1.2~2.0℃) at 10 am to 2 pm. Temperature difference between six OTC chambers was not detected. The relative humidity inside and outside the chambers was the same, with minor variations (0~1%). The system required the highest amount of CO₂ for operation in June, and consumed 11.33 and 17.04 ton in June 2010 and 2011, respectively.
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