caa a22 4500 605517215 CHVBK 20210128100718.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s10533-015-0075-6 doi (NATIONALLICENCE)springer-10.1007/s10533-015-0075-6 Non-linear response of carbon dioxide and methane emissions to oxygen availability in a drained histosol [Elektronische Daten] [Gavin McNicol, Whendee Silver] Organic-rich wetland soils in the histosol soil order represent the largest soil carbon (C) pool globally. Carbon accumulation in these ecosystems is largely due to oxygen (O2) limitation of decomposition. Increased O2 availability from wetland drainage and climate change may stimulate C decomposition overall and affect the balance of carbon dioxide (CO2) and methane (CH4) greenhouse gas release. Characterizing relationships, including non-linearity, between soil O2 and C gas emissions is therefore critical to predict the partitioning and rate of C release from histosols under greater O2 availability. We varied gas-phase O2 concentration from 0.03 to 20% in incubations of a sapric histosol and measured resulting CO2 and CH4 emissions. Efflux of CO2 increased and CH4 emissions decreased at higher O2 concentrations, and rates were best described by log-linear model fits. The non-linear response of CO2 and CH4 emissions to O2 concentration indicates that moist, C rich histosols may be highly sensitive to increases in O2 availability, even below concentration thresholds typically classified as anoxic. Springer International Publishing Switzerland, 2015 Soil respiration nationallicence Methane nationallicence Carbon dioxide nationallicence Oxygen nationallicence Histosol nationallicence Drained peatland nationallicence McNicol Gavin Department of Environmental Science, Policy, and Management, University of California, Berkeley, 130 Mulford Hall, #3114, 94720, Berkeley, CA, USA aut Silver Whendee Department of Environmental Science, Policy, and Management, University of California, Berkeley, 130 Mulford Hall, #3114, 94720, Berkeley, CA, USA aut Biogeochemistry Springer International Publishing 123/1-2(2015-03-01), 299-306 0168-2563 123:1-2<299 2015 123 10533 https://doi.org/10.1007/s10533-015-0075-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 brief-communication jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0075-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- McNicol Gavin Department of Environmental Science, Policy, and Management, University of California, Berkeley, 130 Mulford Hall, #3114, 94720, Berkeley, CA, USA aut NATIONALLICENCE 700 1- Silver Whendee Department of Environmental Science, Policy, and Management, University of California, Berkeley, 130 Mulford Hall, #3114, 94720, Berkeley, CA, USA aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 123/1-2(2015-03-01), 299-306 0168-2563 123:1-2<299 2015 123 10533