Root and rhizosphere contribution to the net soil COS exchange.

Autor: Kitz F; Universität Innsbruck, Institut für Ökologie, Sternwartestraße 15, Innsbruck, 6020 Austria., Wachter H; Universität Innsbruck, Institut für Ökologie, Sternwartestraße 15, Innsbruck, 6020 Austria., Spielmann F; Universität Innsbruck, Institut für Ökologie, Sternwartestraße 15, Innsbruck, 6020 Austria., Hammerle A; Universität Innsbruck, Institut für Ökologie, Sternwartestraße 15, Innsbruck, 6020 Austria., Wohlfahrt G; Universität Innsbruck, Institut für Ökologie, Sternwartestraße 15, Innsbruck, 6020 Austria.
Jazyk: angličtina
Zdroj: Plant and soil [Plant Soil] 2024; Vol. 498 (1-2), pp. 325-339. Date of Electronic Publication: 2023 Dec 23.
DOI: 10.1007/s11104-023-06438-0
Abstrakt: Background and Aims: Partitioning the measured net ecosystem carbon dioxide (CO 2 ) exchange into gross primary productivity (GPP) and ecosystem respiration remains a challenge, which scientists try to tackle by using the properties of the trace gas carbonyl sulfide (COS). Its similar pathway into and within the leaf makes it a potential photosynthesis proxy. The application of COS as an effective proxy depends, among other things, on a robust inventory of potential COS sinks and sources within ecosystems. While the soil received some attention during the last couple of years, the role of plant roots is mostly unknown. In our study, we investigated the effects of live roots on the soil COS exchange.
Methods: An experimental setup was devised to measure the soil and the belowground plant parts of young beech trees observed over the course of 9 months.
Results: During the growing season, COS emissions were significantly lower when roots were present compared to chambers only containing soil, while prior to the growing season, with photosynthetically inactive trees, the presence of roots increased COS emissions. The difference in the COS flux between root-influenced and uninfluenced soil was fairly constant within each month, with diurnal variations in the COS flux driven primarily by soil temperature changes rather than the presence or absence of roots.
Conclusion: While the mechanisms by which roots influence the COS exchange are largely unknown, their contribution to the overall ground surface COS exchange should not be neglected when quantifying the soil COS exchange.
Supplementary Information: The online version contains supplementary material available at 10.1007/s11104-023-06438-0.
Competing Interests: Conflict of InterestThe authors have no conflicts of interest to declare that are relevant to the content of this article. All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript. The authors have no financial or proprietary interests in any material discussed in this article.
(© The Author(s) 2023.)
Databáze: MEDLINE
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