Plant responses to volcanically elevated CO 2 in two Costa Rican forests

Bogue, Robert R.; Schwandner, Florian M.; Fisher, Joshua B.; Pavlick, Ryan; Magney, Troy S.; Famiglietti, Caroline A.; Cawse-Nicholson, Kerry; Yadav, Vineet; Linick, Justin P.; North, Gretchen B.; Duarte, Eliecer

We explore the use of active volcanoes to determine the short- and long-term effects of elevated inline-formulaCO2 on tropical trees. Active volcanoes continuously but variably emit inline-formulaCO2 through diffuse emissions on their flanks, exposing the overlying ecosystems to elevated levels of atmospheric inline-formulaCO2. We found tight correlations (inline-formular2=0.86 and inline-formular2=0.74) between wood stable carbon isotopic composition and co-located volcanogenic inline-formulaCO2 emissions for two of three investigated species (Oreopanax xalapensis and Buddleja nitida), which documents the long-term photosynthetic incorporation of isotopically heavy volcanogenic carbon into wood biomass. Measurements of leaf fluorescence and chlorophyll concentration suggest that volcanic inline-formulaCO2 also has measurable short-term functional impacts on select species of tropical trees. Our findings indicate significant potential for future studies to utilize ecosystems located on active volcanoes as natural experiments to examine the ecological impacts of elevated atmospheric inline-formulaCO2 in the tropics and elsewhere. Results also point the way toward a possible future utilization of ecosystems exposed to volcanically elevated inline-formulaCO2 to detect changes in deep volcanic degassing by using selected species of trees as sensors.



Bogue, Robert R. / Schwandner, Florian M. / Fisher, Joshua B. / et al: Plant responses to volcanically elevated CO2 in two Costa Rican forests. 2019. Copernicus Publications.


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