caa a22 4500 60551755X CHVBK 20210128100720.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s10533-015-0115-2 doi (NATIONALLICENCE)springer-10.1007/s10533-015-0115-2 Rapid cycling of recently fixed carbon in a Spartina alterniflora system: a stable isotope tracer experiment [Elektronische Daten] [Amanda Spivak, Jennifer Reeve] Carbon dynamics in vegetated ecosystems are influenced by plants, belowground bacteria, and their interactions. Consequently, quantifying the fate of new plant production, identifying bacterial carbon sources, and evaluating plant-microbe interactions can provide insight to carbon cycling and storage. To follow short-term carbon transformations in a Spartina alterniflora—soil system, we applied 13C-labeled CO2 to aboveground leaves and chased it belowground into roots and bacterial lipids. Plant mesocosms were exposed to 13CO2 for 0, 1, 3, or 6h. Incorporation of 13CO2 by plants and soil microbes was measured immediately after the incubation (Day 0) and 24h later (Day 1). During a 24h period, 41-64% of the 13CO2 fixed by S. alterniflora was retained in leaves, 2.7-6.4% was transferred to roots, and 30-55% was lost via respiration. Small fractions of 13C assimilated by aboveground leaves were detected belowground in bacterial lipids on Day 1. Enrichment of lipids specific to sulfate reducing bacteria (10-methyl C16:0, cy-C17:0) indicated tight coupling between aboveground plant production and belowground anaerobic metabolisms. Overall, we found that a substantial fraction of new production was returned to the atmosphere within 24h and that belowground bacteria were tightly coupled to plant dynamics. Springer International Publishing Switzerland, 2015 Carbon cycling nationallicence Wetland nationallicence Stable isotope nationallicence Lipid biomarkers nationallicence Spartina alterniflora nationallicence Mesocosm nationallicence Respiration nationallicence Spivak Amanda Marine Chemistry & Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA aut Reeve Jennifer Haverford College, Haverford, PA, USA aut Biogeochemistry Springer International Publishing 125/1(2015-08-01), 97-114 0168-2563 125:1<97 2015 125 10533 https://doi.org/10.1007/s10533-015-0115-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0115-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Spivak Amanda Marine Chemistry & Geochemistry Department, Woods Hole Oceanographic Institution, Woods Hole, MA, USA aut NATIONALLICENCE 700 1- Reeve Jennifer Haverford College, Haverford, PA, USA aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 125/1(2015-08-01), 97-114 0168-2563 125:1<97 2015 125 10533