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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1111/nph.12290
|2 doi
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|a eng
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|a Lynch, Douglas J
|e verfasserin
|4 aut
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|a Stored carbon partly fuels fine-root respiration but is not used for production of new fine roots
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|c 2013
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 15.01.2014
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|a Date Revised 18.04.2021
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a No claim to original US government works. New Phytologist © 2013 New Phytologist Trust.
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|a The relative use of new photosynthate compared to stored carbon (C) for the production and maintenance of fine roots, and the rate of C turnover in heterogeneous fine-root populations, are poorly understood. We followed the relaxation of a (13)C tracer in fine roots in a Liquidambar styraciflua plantation at the conclusion of a free-air CO(2) enrichment experiment. Goals included quantifying the relative fractions of new photosynthate vs stored C used in root growth and root respiration, as well as the turnover rate of fine-root C fixed during [CO(2)] fumigation. New fine-root growth was largely from recent photosynthate, while nearly one-quarter of respired C was from a storage pool. Changes in the isotopic composition of the fine-root population over two full growing seasons indicated heterogeneous C pools; < 10% of root C had a residence time < 3 months, while a majority of root C had a residence time > 2 yr. Compared to a one-pool model, a two-pool model for C turnover in fine roots (with 5 and 0.37 yr(-1) turnover times) doubles the fine-root contribution to forest NPP (9-13%) and supports the 50% root-to-soil transfer rate often used in models
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|a Journal Article
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Carbon Isotopes
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|a Carbon Dioxide
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|a Matamala, Roser
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|a Iversen, Colleen M
|e verfasserin
|4 aut
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|a Norby, Richard J
|e verfasserin
|4 aut
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|a Gonzalez-Meler, Miquel A
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 199(2013), 2 vom: 03. Juli, Seite 420-430
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|g volume:199
|g year:2013
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|g month:07
|g pages:420-430
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|u http://dx.doi.org/10.1111/nph.12290
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