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Dissolved oxygen isotope modelling refines metabolic state estimates of stream ecosystems with different land use background

Piatka, David R. 1; Venkiteswaran, Jason J.; Uniyal, Bhumika; Kaule, Robin; Gilfedder, Benjamin; Barth, Johannes A. C.
1 Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU), Karlsruher Institut für Technologie (KIT)

Abstract:

Dissolved oxygen (DO) is crucial for aerobic life in streams and rivers and mostly depends on photosynthesis (P), ecosystem respiration (R) and atmospheric gas exchange (G). However, climate and land use changes progressively disrupt metabolic balances in natural streams as sensitive reflectors of their catchments. Comprehensive methods for mapping fundamental ecosystem services become increasingly important in a rapidly changing environment. In this work we tested DO and its stable isotope ($^{18}$O$^{16}$O) ratios as novel tools for the status of stream ecosystems. For this purpose, six diel sampling campaigns were performed at three low-order and mid-latitude European streams with different land use patterns. Modelling of diel DO and its stable isotopes combined with land use analyses showed lowest P rates at forested sites, with a minimum of 17.9 mg m$^{-2}$ h$^{-1}$. Due to high R rates between 230 and 341 mg m$^{-2}$ h$^{-1}$ five out of six study sites showed a general heterotrophic state with P:R:G ratios between 0.1:1.1:1 and 1:1.9:1. Only one site with agricultural and urban influences showed a high P rate of 417 mg m$^{-2}$ h$^{-1}$ with a P:R:G ratio of 1.9:1.5:1. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000149395
Veröffentlicht am 04.08.2022
Originalveröffentlichung
DOI: 10.1038/s41598-022-13219-9
Scopus
Zitationen: 7
Web of Science
Zitationen: 6
Dimensions
Zitationen: 8
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2022
Sprache Englisch
Identifikator ISSN: 2045-2322
KITopen-ID: 1000149395
HGF-Programm 12.11.22 (POF IV, LK 01) Managed ecosystems as sources and sinks of GHGs
Erschienen in Scientific Reports
Verlag Nature Research
Band 12
Seiten Art.-Nr.: 10204
Vorab online veröffentlicht am 17.06.2022
Nachgewiesen in Scopus
Dimensions
Web of Science
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