A new technique to measure soil CO<sub>2</sub> efflux at constant CO<sub>2</sub> concentration期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

按检索

A new technique to measure soil CO₂ efflux at constant CO₂ concentration

Authors:	Jens-Arne Subke Ilaria Inglima Gemini Delle Vedove

Institution:	^a Department of Environmental Sciences, Second University of Naples, Via Vivaldi 43, 81100 Caserta, Italy ^b Department of Crop Science and Agricultural Engineering, University of Udine, Via delle Science 208, 33100 Udine, Italy

Abstract:	A new principle for measuring soil CO₂ efflux at constant ambient concentration is introduced. The measuring principle relies on the continuous absorption of CO₂ within the system to achieve a constant CO₂ concentration inside the soil chamber at ambient level, thus balancing the amount of CO₂ entering the soil chamber by diffusion from the soil. We report results that show reliable soil CO₂ efflux measurements with the new system. The novel measuring principle does not disturb the natural gradient of CO₂ within the soil, while allowing for continuous capture of the CO₂ released from the soil. It therefore holds great potential for application in simultaneous measurements of soil CO₂ efflux and its δ¹³C, since both variables show sensitivity to a distortion of the soil CO₂ profile commonly found in conventional chamber techniques.

Keywords:	Soil CO₂ efflux Chamber techniques Stable C isotopes Constant CO₂ Soil CO₂ gradient
本文献已被 ScienceDirect 等数据库收录！