Process-based ecosystem-atmosphere exchange of CO2, H2O and volatile organic compounds (VOCs) (A04)

• Subject Area: Ecology and Biodiversity of Plants and Ecosystems ; Microsystems ; Plant Physiology
• Term: since 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 459819582

A4.1 Ecosystem-level responses and feedbacks in ecosystem-atmosphere exchange of CO2, H2O and VOCs in a heterogeneous forest ecosystem To bridge the gap between the relatively small scale of an individual tree, and a forest stand, A4.1 will assess ecosystem-atmosphere exchange by three towers for eddy covariance measurements of H2O, CO2 and its isoflux (13CO2), to separate fluxes into components (ecosystem respiration and gross primary production) at an integrated scale. Further VOC uptake and release by our forests will be measured, linking to important ecosystem functions, which are strongly sensitive to environmental changes. A4.2 Development of a interband cascade laser-based measurement system for studying ecosystem-atmosphere exchange of VOCsHere, we will develop, for the first time, an optical spectroscopic sensing technology, to measure VOCs using tuneable laser absorption spectroscopy (TLAS), i.e., concentration gradients along the tower (A4.1) and connected to single-leaf cuvettes, as developed in A3.2.

• DFG Programme: Collaborative Research Centres
• Subproject of: SFB 1537: ECOSENSE – Multiscale quantification of spatio-temporal dynamics of ecosys-tem processes by smart autonomous sensor networks
• Applicant Institution: Albert-Ludwigs-Universität Freiburg
• Project Heads: Professor Dr. Andreas Christen; Privatdozent Dr. Jürgen Kreuzwieser; Professor Dr.-Ing. Jürgen Wöllenstein