Progressive nitrogen limitation of ecosystem processes under elevated CO2 in a warm-temperate forest

Ecology
Adrien FinziWilliam H Schlesinger

Abstract

A hypothesis for progressive nitrogen limitation (PNL) proposes that net primary production (NPP) will decline through time in ecosystems subjected to a step-function increase in atmospheric CO2. The primary mechanism driving this response is a rapid rate of N immobilization by plants and microbes under elevated CO2 that depletes soils of N, causing slower rates of N mineralization. Under this hypothesis, there is little long-term stimulation of NPP by elevated CO2 in the absence of exogenous inputs of N. We tested this hypothesis using data on the pools and fluxes of C and N in tree biomass, microbes, and soils from 1997 through 2002 collected at the Duke Forest free-air CO2 enrichment (FACE) experiment. Elevated CO2 stimulated NPP by 18-24% during the first six years of this experiment. Consistent with the hypothesis for PNL, significantly more N was immobilized in tree biomass and in the O horizon under elevated CO2. In contrast to the PNL hypothesis, microbial-N immobilization did not increase under elevated CO2, and although the rate of net N mineralization declined through time, the decline was not significantly more rapid under elevated CO2. Ecosystem C-to-N ratios widened more rapidly under elevated CO2 than ambient CO2...Continue Reading

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Citations

Jan 12, 2013·Oecologia·Sebastian Leuzinger, Stephan Hättenschwiler
Dec 7, 2005·Proceedings of the National Academy of Sciences of the United States of America·Richard J NorbyRam Oren
Jan 2, 2009·Proceedings of the National Academy of Sciences of the United States of America·William H Schlesinger
Jun 24, 2010·Tree Physiology·Martin LukacFrancesco Loreto
May 29, 2013·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·S Zaehle
Jul 27, 2010·PloS One·Lucas C R SilvaMark D Leithead
Nov 22, 2007·Ecology·Donald R ZakKurt S Pregitzer
Aug 13, 2011·Ecological Applications : a Publication of the Ecological Society of America·Chao GaoYiqi Luo
Apr 5, 2012·Ecological Applications : a Publication of the Ecological Society of America·Chaoqun LuChi Zhang
Dec 13, 2006·Proceedings of the National Academy of Sciences of the United States of America·Heather R McCarthyKurt H Johnsen
Aug 22, 2007·Proceedings of the National Academy of Sciences of the United States of America·Adrien C FinziReinhart Ceulemans
Aug 30, 2014·Environment International·Alan G JonesDylan Gwynn-Jones
Nov 3, 2007·Ecological Applications : a Publication of the Ecological Society of America·Meredith T Zaccherio, Adrien C Finzi
Oct 4, 2007·Ecology Letters·Feike A Dijkstra, Weixin Cheng
May 17, 2007·The New Phytologist·Oskar Franklin
Feb 18, 2011·The New Phytologist·Yuanhe YangAdrien C Finzi
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Sep 1, 2015·Frontiers in Microbiology·Robert L SinsabaughDarren Sandquist
Mar 12, 2008·Environmental Pollution·R JandlS Zechmeister-Boltenstern
Mar 15, 2015·Journal of Environmental Sciences (China)·Jia GuoWeijian Zhang
Jan 30, 2015·Frontiers in Plant Science·Robinson W FulweilerAdrien C Finzi
Feb 8, 2018·Environmental Microbiology·Ember M MorrisseyBruce A Hungate
Mar 13, 2014·Applied and Environmental Microbiology·Sean T BerthrongCheryl R Kuske

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