Progressive N limitation in forests: review and implications for long-term responses to elevated CO2

Ecology
Dale W Johnson

Abstract

Field studies have shown that elevated CO2 can cause increased forest growth over the short term (<6 years) even in the face of N limitation. This is facilitated to some degree by greater biomass production per unit N uptake (lower tissue N concentrations), but more often than not, N uptake is increased with elevated CO2 as well. Some studies also show that N sequestration in the forest floor is increased with elevated CO2. These findings raise the questions of where the "extra" N comes from and how long such growth increases can continue without being truncated by progressive N limitation (PNL). This paper reviews some of the early nutrient cycling literature that describes PNL during forest stand development and attempts to use this information, along with recent developments in soil N research, to put the issue of PNL with elevated CO2 into perspective. Some of the early studies indicated that trees can effectively "mine" N from soils over the long term, and more recent developments in soil N cycling research suggest mechanisms by which this might have occurred. However, both the early nutrient cycling literature and more recent simulation modeling suggest that PNL will at some point truncate the observed increases in growth...Continue Reading

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Citations

Oct 27, 2010·Proceedings of the National Academy of Sciences of the United States of America·Richard J NorbyRoss E McMurtrie
Jun 17, 2010·Tree Physiology·Peter Millard, Gwen-Aelle Grelet
Mar 7, 2013·Tree Physiology·Xiang-Wen FangFeng-Min Li
Dec 3, 2010·Proceedings. Biological Sciences·Daniel A Levitis
May 29, 2013·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Peter M VitousekCory C Cleveland
Oct 25, 2013·Journal of Experimental Botany·Zhihong SunÜlo Niinemets
Apr 21, 2007·Proceedings of the National Academy of Sciences of the United States of America·Kendra K McLauchlanGene E Likens
Mar 29, 2012·Ecology Letters·Brett P Murphy, David M J S Bowman
Feb 18, 2011·The New Phytologist·Yuanhe YangAdrien C Finzi
Mar 27, 2013·The New Phytologist·Frank P DayC Ross Hinkle
Jun 20, 2016·Journal of Plant Physiology·Devrim CoskunHerbert J Kronzucker
Sep 2, 2020·Environment International·Zhili HeJizhong Zhou
Oct 23, 2020·Nature Communications·A CollaltiI C Prentice
Feb 3, 2021·The Science of the Total Environment·Enzai DuWim de Vries
Aug 14, 2021·Tree Physiology·Richard J NorbyAnthony P Walker

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