Improved Semi-open CO2 Concentration and Temperature Gradient Chambers (CTGC): Controlling to CO2 Concentration

doi:10.3969/j.issn.1000-6362.2017.02.005

Abstract

Abstract: Environmental simulation system is an effective way to study the response of agro-ecological system to global change. However, current atmospheric carbon dioxide (CO2) enrichment simulation systems have some limitations, including excessive CO2 gas consumption, high experimental cost, disparity between the simulated and the natural environments, space limitation, lack of replications. To address these problems, we upgraded the hardware and improved the design of the CO2 concentration and temperature gradient chambers (CTGCs) that control CO2 gas to release accurately and cost-effectively to improve the simulation of future elevated CO2 concentration environment. Besides, the improved CTGCs was more spacious, which allowed the growth of more crop species simultaneously. In this system we used a set of electromagnetic valves and an individual CO2 concentration infrared sensor to constitute a multi-passageway CO2 concentration monitoring system for real-time monitoring of the change in CO2 concentration. A proportional pressure reducing regulator valve was also deployed at the source of CO2 gas emission. This effectively reduced the pressure storing in the gas pipeline when CO2 was compressed and released from the gasholder, which resulted in accurate CO2 gas emission. The pipeline consisted of head and peripheral branch tubes which were connected to the flux regulating valve. The equipment changed the CO2 gas emission from longitudinal to lateral emission. The above changes form an evenly-distributed CO2 gas released area in the improved CTGC system. The improved CTGC system achieved CO2 concentrations of 387±4.5, 441±13.4, 490±20.9, 534±24.3 and 567±28.9μmol·mol-1. The system improved effectively the response to environmental change, performed accurately real-time monitoring the change in CO2 concentration in every treatment of the chamber, and released precisely CO2 gas to maintain the targeted CO2 concentration gradient in a stable and continuously manner. In summary, the improved CTGC system would be a better system for studying the responses of plants to CO2 enrichment.

Key words: CTGC system, CO2 concentration gradient, Semi-open, CO2 simulation systems

LI Yu-ting, FENG Yong-xiang, HAN Xue, TONG Cheng-feng, WEI Qiang, LI Ying-chun. Improved Semi-open CO2 Concentration and Temperature Gradient Chambers (CTGC): Controlling to CO2 Concentration[J]. Chinese Journal of Agrometeorology, 2017, 38(02): 104-112.

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