Increases in the flux of carbon belowground stimulate nitrogen uptake and sustain the long-term enhancement of forest productivity under elevated CO2

Ecology Letters (2011) 14: 349–357 The earth’s future climate state is highly dependent upon changes in terrestrial C storage in response to rising concentrations of atmospheric CO2. Here we show that consistently enhanced rates of net primary production (NPP) are sustained by a C‐cascade through th...

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Vydáno v:	Ecology letters Ročník 14; číslo 4; s. 349 - 357
Hlavní autoři:	Drake, John E., Gallet-Budynek, Anne, Hofmockel, Kirsten S., Bernhardt, Emily S., Billings, Sharon A., Jackson, Robert B., Johnsen, Kurt S., Lichter, John, McCarthy, Heather R., McCormack, M. Luke, Moore, David J. P., Oren, Ram, Palmroth, Sari, Phillips, Richard P., Pippen, Jeffrey S., Pritchard, Seth G., Treseder, Kathleen K., Schlesinger, William H., DeLucia, Evan H., Finzi, Adrien C.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Oxford, UK Blackwell Publishing Ltd 01.04.2011 Blackwell
Témata:	Animal and plant ecology Animal, plant and microbial ecology Biological and medical sciences Biomass Carbon dioxide Carbon sequestration coupled biogeochemical cycles coupled climate-carbon cycle models elevated CO2 Forest productivity Forestry Forests Fundamental and applied biological sciences. Psychology General aspects General forest ecology Generalities. Production, biomass. Quality of wood and forest products. General forest ecology Microbial activity Nitrogen Organic matter Plant growth Primary production Soil organic matter Productivity Climate Forests Carbon dioxide Increase coupled climate-carbon cycle models Biogeochemical cycle Nitrogen Carbon Long term Carbon sequestration coupled biogeochemical cycles elevated CO Carbon cycle Medium enrichment forest productivity Models
ISSN:	1461-023X, 1461-0248
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Shrnutí:	Ecology Letters (2011) 14: 349–357 The earth’s future climate state is highly dependent upon changes in terrestrial C storage in response to rising concentrations of atmospheric CO2. Here we show that consistently enhanced rates of net primary production (NPP) are sustained by a C‐cascade through the root‐microbe‐soil system; increases in the flux of C belowground under elevated CO2 stimulated microbial activity, accelerated the rate of soil organic matter decomposition and stimulated tree uptake of N bound to this SOM. This process set into motion a positive feedback maintaining greater C gain under elevated CO2 as a result of increases in canopy N content and higher photosynthetic N‐use efficiency. The ecosystem‐level consequence of the enhanced requirement for N and the exchange of plant C for N belowground is the dominance of C storage in tree biomass but the preclusion of a large C sink in the soil.
Bibliografie:	ArticleID:ELE1593 istex:5BC869E9299BE5218C783E15762F5A20ECE6DB4A ark:/67375/WNG-JT97DM0M-Z SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-2 content type line 23
ISSN:	1461-023X 1461-0248
DOI:	10.1111/j.1461-0248.2011.01593.x