Nitrogen uptake, distribution, turnover, and efficiency of use in a CO2-enriched sweetgum forest

Ecology
Richard J Norby, Colleen M Iversen

Abstract

The Progressive Nitrogen Limitation (PNL) hypothesis suggests that ecosystems in a CO2-enriched atmosphere will sequester C and N in long-lived biomass and soil organic pools, thereby limiting available N and constraining the continued response of net primary productivity to elevated [CO2]. Here, we present a six-year record of N dynamics of a sweetgum (Liquidambar styraciflua) stand exposed to elevated [CO2] in the free-air CO2 enrichment (FACE) experiment at Oak Ridge, Tennessee, USA. We also evaluate the concept of PNL for this ecosystem from the perspective of N uptake, content, distribution, and turnover, and N-use efficiency. Leaf N content was 11% lower on a leaf mass basis (NM) and 7% lower on a leaf area basis (NA) in CO2-enriched trees. However, there was no effect of [CO2] on total canopy N content. Resorption of N during senescence was not altered by [CO2], so NM of litter, but not total N content, was reduced. The NM of fine roots was not affected, but the total amount of N required for fine-root production increased significantly, reflecting the large stimulation of fine-root production in this stand. Hence, total N requirement of the trees was higher in elevated [CO2], and the increased requirement was met throug...Continue Reading

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Citations

Sep 5, 2008·Oecologia·Susan M NataliManuel T Lerdau
Dec 7, 2005·Proceedings of the National Academy of Sciences of the United States of America·Richard J NorbyRam Oren
Oct 27, 2010·Proceedings of the National Academy of Sciences of the United States of America·Richard J NorbyRoss E McMurtrie
May 23, 2012·Proceedings of the National Academy of Sciences of the United States of America·Terry C DanielAndreas von der Dunk
Feb 11, 2009·Tree Physiology·Justin M KunkleRichard K Kobe
Jun 24, 2010·Tree Physiology·Martin LukacFrancesco Loreto
Nov 22, 2007·Ecology·Donald R ZakKurt S Pregitzer
Aug 22, 2007·Proceedings of the National Academy of Sciences of the United States of America·Adrien C FinziReinhart Ceulemans
Jul 20, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Evan WeiherStephen Bentivenga
Apr 12, 2007·The American Naturalist·Stephen J Tonsor, Samuel M Scheiner
Aug 26, 2009·Rapid Communications in Mass Spectrometry : RCM·Charles T Garten, Deanne J Brice
Jun 10, 2008·The New Phytologist·Colleen M IversenRichard J Norby
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
Aug 14, 2012·The New Phytologist·Sasha C ReedCory C Cleveland
Mar 19, 2014·The New Phytologist·Sara M Top, Timothy R Filley
Apr 8, 2015·Global Change Biology·Zhaozhong FengJohan Uddling
Mar 15, 2015·Journal of Environmental Sciences (China)·Jia GuoWeijian Zhang
Dec 23, 2016·Ecological Applications : a Publication of the Ecological Society of America·Qing ZhuJinyun Tang
Oct 29, 2013·Applied and Environmental Microbiology·Babur S MirzaJorge L M Rodrigues
Dec 31, 2010·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mohd Hafiz IbrahimZaharah Abdul Rahman
Mar 15, 2020·Applied and Environmental Microbiology·Babur S MirzaJorge L M Rodrigues
Apr 27, 2019·Frontiers in Plant Science·Inga DirksIna C Meier
Aug 14, 2021·Tree Physiology·Richard J NorbyAnthony P Walker

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