Setup of a large-scale test field for distributed soil gas sensors and testing of a monitoring method based on tomography

Neumann, Patrick P.; Werner, Klaus-Dieter; Petrov, Sergej; Bartholmai, Matthias; Lazik, Detlef

doi:10.1515/teme-2016-0015

Cited by 2 publications

(2 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the CO 2 concentrations measured consistently reflect the different plant densities. In previous experiments, line sensors with lengths of up to 40 m were successfully tested in soil (Lazik and Ebert, 2013; Neumann et al, 2016b; Lazik et al, 2016). Hence, we conclude that line sensors will have the potential to correctly measure the average CO 2 concentrations in a heterogeneous environment at the field scale, i.e., across several decameters relevant for plant communities.…”

Section: Discussionmentioning

confidence: 99%

“…The initial development of the line sensor was motivated by the need to detect and quantify CO 2 leakages from subsurface gas repositories (Lazik and Ebert, 2013; Neumann et al, 2016a, 2016b; Lazik et al, 2016) where higher concentrations are expected compared with uninfluenced soils. For this application, the gas‐selective membrane of a line sensor was combined with a gas‐tight reference membrane to compensate for environmental parameters (air pressure, soil temperature).…”

Section: Soil Gas Measurementmentioning

confidence: 99%

See 1 more Smart Citation

New Sensor Technology for Field‐Scale Quantification of Carbon Dioxide in Soil

Lazik

Vetterlein

Salas

et al. 2019

Vadose Zone Journal

Self Cite

View full text Add to dashboard Cite

Core Ideas This new technology is suitable for field‐scale quantification of CO2 in soil. The measurement scale ranges from decimeters up to decameters. The concentrations from the soil water and air phases are averaged. Transient CO2 production and transport reflect plant growth. Biological activity in soil causes fluxes of O2 into and CO2 out of the soil with significant global relevance. Hence, the dynamics of CO2 concentrations in soil can be used as an indicator for biological activity. However, there is an enormous spatial and temporal variability in soil respiration, which has led to the notion of hotspots and hot moments. This variability is attributed to the spatiotemporal heterogeneity of both plant–soil–microbiome interactions and the local conditions governing gas transport. For the characterization of a given soil, the local heterogeneities should be replaced by some meaningful average. To this end, we introduce a line sensor based on tubular gas‐selective membranes that is applicable at the field scale for a wide range in water content. It provides the average CO2 concentration of the ambient soil along its length. The new technique corrects for fluctuating external conditions (i.e., temperature and air pressure) and the impact of water vapor without any further calibration. The new line sensor was tested in a laboratory mesocosm experiment where CO2 concentrations were monitored at two depths during the growth of barley (Hordeum vulgare L.). The results could be consistently related to plant development, plant density, and changing conditions for gas diffusion toward the soil surface. The comparison with an independent CO2 sensor confirmed that the new sensor is actually capable of determining meaningful average CO2 concentrations in a natural soil for long time periods.

show abstract

Section: Discussionmentioning

confidence: 99%