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A new automated stem CO<SUB>2</SUB> efflux chamber based on industrial ultra-low-cost sensors

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dc.contributor.author Brändle, Johannes en
dc.contributor.author Kunert, Norbert en
dc.date.accessioned 2019-10-29T02:01:43Z
dc.date.available 2019-10-29T02:01:43Z
dc.date.issued 2019
dc.identifier.citation Brändle, Johannes and Kunert, Norbert. 2019. "<a href="https://repository.si.edu/handle/10088/99300">A new automated stem CO2 efflux chamber based on industrial ultra-low-cost sensors</a>." <em>Tree physiology</em>. 39 (12):1975&ndash;1983. <a href="https://doi.org/10.1093/treephys/tpz104">https://doi.org/10.1093/treephys/tpz104</a> en
dc.identifier.issn 1758-4469
dc.identifier.uri https://hdl.handle.net/10088/99300
dc.description.abstract Tree autotrophic respiratory processes, especially stem respiration or stem CO2 efflux (Estem), are important components of the forest carbon budget. Despite the efforts to investigate the controlling processes of Estem in the last years a considerable lack in our knowledge remains on the abiotic and biotic drivers affecting Estem dynamics. It has been strongly advocated that long-term measurements would shed light into those processes. The expensive scientific instruments needed to measure gas exchange has prevented from applying Estem measurements on a larger temporal and spatial scale. Here, we present an automated closed dynamic chamber system based on inexpensive and industrially broadly applied CO2 sensors reducing the costs for the sensing system to a minimum. The CO2 sensor was cross-calibrated with a commonly used gas exchange system in the laboratory and in the field, and we found very good accordance of these sensors. We tested the system under harsh tropical climatic conditions, characterized by heavy tropical rainfall events, extreme humidity, and temperatures, in a moist lowland forest in Malaysia. We recorded Estem of three Dyera costulata trees with our prototype over various days. The variation of Estem was large among the three tree individuals and varied by 7.5-fold. However, clear diurnal changes in Estem were present in all three tree individuals. One tree showed high diurnal variation in Estem and the relationship between Estem and temperature was characterized by a strong hysteresis. The large variations found within one single tree species highlights the importance of continuous measurement to quantify ecosystem carbon fluxes. en
dc.relation.ispartof Tree physiology en
dc.title A new automated stem CO<SUB>2</SUB> efflux chamber based on industrial ultra-low-cost sensors en
dc.type Journal Article en
dc.identifier.srbnumber 152942
dc.identifier.doi 10.1093/treephys/tpz104
rft.jtitle Tree physiology
rft.volume 39
rft.issue 12
rft.spage 1975
rft.epage 1983
dc.description.SIUnit STRI en
dc.description.SIUnit NZP en
dc.citation.spage 1975
dc.citation.epage 1983

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