IMPACT4SOIL OpenAire Bielefeld Academic Search Engine (BASE) UnpayWall Crossref Microsoft Academic Graph PubMed Central https://digitalcommons.odu.edu/context/biology_fac_pubs/article/1264/viewcontent/Day2013CumulativeResponseofEcosystemCarbonandNitrogenOCR.pdf https://doi.org/10.1111/nph.12333 New Phytologist Open Access 2013-05-30 Summary<p> <p>Rising atmospheric carbon dioxide (CO2) could alter the carbon (C) and nitrogen (N) content of ecosystems, yet the magnitude of these effects are not well known. We examined C and N budgets of a subtropical woodland after 11ￂﾠyr of exposure to elevated CO2.</p> <p>We used open￢ﾀﾐtop chambers to manipulate CO2 during regrowth after fire, and measured C, N and tracer 15N in ecosystem components throughout the experiment.</p> <p>Elevated CO2 increased plant C and tended to increase plant N but did not significantly increase whole￢ﾀﾐsystem C or N. Elevated CO2 increased soil microbial activity and labile soil C, but more slowly cycling soil C pools tended to decline. Recovery of a long￢ﾀﾐterm 15N tracer indicated that CO2 exposure increased N losses and altered N distribution, with no effect on N inputs.</p> <p>Increased plant C accrual was accompanied by higher soil microbial activity and increased C losses from soil, yielding no statistically detectable effect of elevated CO2 on net ecosystem C uptake. These findings challenge the treatment of terrestrial ecosystems responses to elevated CO2 in current biogeochemical models, where the effect of elevated CO2 on ecosystem C balance is described as enhanced photosynthesis and plant growth with decomposition as a first￢ﾀﾐorder response.</p> </p> Soil organic matter Long term experiment Elevated atmospheric CO2 Florida scrub oak Scrub oak Research Plant Sciences Aboveground biomass Plant Biology Microbial communities 04 agricultural and veterinary sciences Carbon Cycling 15. Life on land Forest productivity Soil carbon Rhizosphere processes Terrestrial ecosystems Dioxide enrichment 13. Climate action 0401 agriculture, forestry, and fisheries Elevated CO2 Climate feedbacks Global change Subtropical woodland Nitrogen cycling Frank P. Day, Dale W. Johnson, Jay L. Garland, Benjamin D. Duval, Benjamin D. Duval, J. Patrick Megonigal, Paul Dijkstra, Alisha L. P. Brown, Bruce A. Hungate, Zhuoting Wu, Zhuoting Wu, 2013-05-30 journalpaper Summary<p> <p>Rising atmospheric carbon dioxide (CO2) could alter the carbon (C) and nitrogen (N) content of ecosystems, yet the magnitude of these effects are not well known. We examined C and N budgets of a subtropical woodland after 11ￂﾠyr of exposure to elevated CO2.</p> <p>We used open￢ﾀﾐtop chambers to manipulate CO2 during regrowth after fire, and measured C, N and tracer 15N in ecosystem components throughout the experiment.</p> <p>Elevated CO2 increased plant C and tended to increase plant N but did not significantly increase whole￢ﾀﾐsystem C or N. Elevated CO2 increased soil microbial activity and labile soil C, but more slowly cycling soil C pools tended to decline. Recovery of a long￢ﾀﾐterm 15N tracer indicated that CO2 exposure increased N losses and altered N distribution, with no effect on N inputs.</p> <p>Increased plant C accrual was accompanied by higher soil microbial activity and increased C losses from soil, yielding no statistically detectable effect of elevated CO2 on net ecosystem C uptake. These findings challenge the treatment of terrestrial ecosystems responses to elevated CO2 in current biogeochemical models, where the effect of elevated CO2 on ecosystem C balance is described as enhanced photosynthesis and plant growth with decomposition as a first￢ﾀﾐorder response.</p> </p> Cumulative Response Of Ecosystem Carbon And Nitrogen Stocks To Chronic Co2exposure In A Subtropical Oak Woodland 10.1111/nph.12333