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28 March 2024
 
  » pubmed » pmid16151007

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Rising atmospheric CO2 reduces sequestration of root-derived soil carbon
James Heath ; Edward Ayres ; Malcolm Possell ; Richard D Bardgett ; Helaina I J Black ; Helen Grant ; Phil Ineson ; Gerhard Kerstiens ;
Date 9 Sep 2005
Journal Science, 309 (5741), 1711-3
AbstractForests have a key role as carbon sinks, which could potentially mitigate the continuing increase in atmospheric carbon dioxide concentration and associated climate change. We show that carbon dioxide enrichment, although causing short-term growth stimulation in a range of European tree species, also leads to an increase in soil microbial respiration and a marked decline in sequestration of root-derived carbon in the soil. These findings indicate that, should similar processes operate in forest ecosystems, the size of the annual terrestrial carbon sink may be substantially reduced, resulting in a positive feedback on the rate of increase in atmospheric carbon dioxide concentration.
Source PubMed, pmid16151007 doi: 10.1126/science.1110700
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