Nitrogen cycling during seven years of atmospheric CO2 enrichment in a scrub oak woodland

Ecology
B A HungateBert G Drake

Abstract

Experimentally increasing atmospheric CO2 often stimulates plant growth and ecosystem carbon (C) uptake. Biogeochemical theory predicts that these initial responses will immobilize nitrogen (N) in plant biomass and soil organic matter, causing N availability to plants to decline, and reducing the long-term CO2-stimulation of C storage in N limited ecosystems. While many experiments have examined changes in N cycling in response to elevated CO2, empirical tests of this theoretical prediction are scarce. During seven years of postfire recovery in a scrub oak ecosystem, elevated CO2 initially increased plant N accumulation and plant uptake of tracer 15N, peaking after four years of CO2 enrichment. Between years four and seven, these responses to CO2 declined. Elevated CO2 also increased N and tracer 15N accumulation in the O horizon, and reduced 15N recovery in underlying mineral soil. These responses are consistent with progressive N limitation: the initial CO2 stimulation of plant growth immobilized N in plant biomass and in the O horizon, progressively reducing N availability to plants. Litterfall production (one measure of aboveground primary productivity) increased initially in response to elevated CO2, but the CO2 stimulatio...Continue Reading

Associated Datasets

Citations

Dec 22, 2009·Applied and Environmental Microbiology·Hector F CastroChristopher W Schadt
Nov 22, 2007·Ecology·Donald R ZakKurt S Pregitzer
Mar 16, 2007·Proceedings of the National Academy of Sciences of the United States of America·Karen M CarneyJ Patrick Megonigal
Feb 18, 2011·The New Phytologist·Yuanhe YangAdrien C Finzi
Mar 15, 2015·Journal of Environmental Sciences (China)·Jia GuoWeijian Zhang
Apr 26, 2014·Science·Kees Jan van GroenigenBruce A Hungate
Jun 20, 2016·Journal of Plant Physiology·Devrim CoskunHerbert J Kronzucker
Mar 21, 2017·Global Change Biology·Laurent AugustoBruno Ringeval
Nov 7, 2006·The New Phytologist·Christian Körner

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