Lazik, D. und Vetterlein, D. und Sood, P. und Kilian-Salas, S. und Apelt, B. und Vogel, H.
(2017)
Time resolved spatially-averaged set up for in situ CO2 monitoring in soil.
In: Jahrestagung der DBG 2017: Horizonte des Bodens, 02.-07.09.2017, Göttingen.
Kurzfassung
Most studies in the past focus on the measurement of CO2 release from the soil surface, which is the parameter of interest for balancing carbon fluxes. However, for advancing our mechanistic understanding measurement of CO2 concentration within the soil are required. Soil CO2 concentrations do not only relate directly to local production of CO2 by plants and soil biota, but are also a key for understanding soil solution chemistry (in particular pH dynamics). The relationship between soil CO2 concentration and CO2 flux at the soil surface will depend on the chemical gradients, the size and connectivity of air filled pore space (related to soil structure and actual water content), and temperature gradients in the system. CO2 production as well as soil water content and temperature show temporal variation directly or indirectly related to day night cycle and related plant growth. It was the aim of the present study to test a recently developed linear membrane-based gas sensor (line sensor) for in situ measurement of soil respiration at high temporal resolution. Data from two soil depths were related to measurement of CO2 flux at the soil surface. Simultaneously, soil temperature, soil water content, and soil matric potential were measured at high temporal resolution in the respective depths. The measurements were conducted in 50 x 50 x 50 cm boxes filled with topsoil material from a Chernozem. To evaluate the sensitivity of the measurement system we compared a treatment planted with barley (Hordeum vulgare) to one without plants (three replications each). Besides a detailed description of the experimental set-up we will present and discuss first results from this new system.
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