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Use of stored carbo...
Use of stored carbon reserves in growth of temperate tree roots and leaf buds : analyses using radiocarbon measurements and modeling
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- Gaudinski, JB (författare)
- University of California, Santa Cruz, CA, USA, and Lawrence Berkeley National Laboratory, Berkeley, CA, USA, and University of California, Berkeley, CA, USA
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- Torn, MS (författare)
- Lawrence Berkeley National Laboratory, Berkeley, CA, USA, and University of California, Berkeley, CA, USA
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- Riley, WJ (författare)
- Lawrence Berkeley National Laboratory, Berkeley, CA, USA
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- Swanston, C (författare)
- Lawrence Livermore National Laboratory, Livermore, CA, USA
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- Trumbore, SE (författare)
- University of California Irvine, Irvine, CA, USA
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- Joslin, JD (författare)
- Belowground Forest Research, Apartado, Santa Elena de Monteverde, Puntarenas, Costa Rica
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- Majdi, Hooshang (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för ekologi,Department of Ecology,Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden
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- Dawson, TE (författare)
- University of California, Berkeley, CA, USA
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- Hanson, J (författare)
- Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA
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(creator_code:org_t)
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- Wiley, 2009
- 2009
- Engelska.
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Ingår i: Global Change Biology. - : Wiley. - 1354-1013 .- 1365-2486. ; 15:4, s. 992-1014
- Relaterad länk:
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https://digital.libr...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Ämnesord
Stäng
- Characterizing the use of carbon (C) reserves in trees is important for understanding regional and global C cycles, stress responses, asynchrony between photosynthetic activity and growth demand, and isotopic exchanges in studies of tree physiology and ecosystem C cycling. Using an inadvertent, whole-ecosystem radiocarbon ((14)C) release in a temperate deciduous oak forest and numerical modeling, we estimated that the mean age of stored C used to grow both leaf buds and new roots is 0.7 years and about 55% of new-root growth annually comes from stored C. Therefore, the calculated mean age of C used to grow new-root tissue is similar to 0.4 years. In short, new roots contain a lot of stored C but it is young in age. Additionally, the type of structure used to model stored C input is important. Model structures that did not include storage, or that assumed stored and new C mixed well (within root or shoot tissues) before being used for root growth, did not fit the data nearly as well as when a distinct storage pool was used. Consistent with these whole-ecosystem labeling results, the mean age of C in new-root tissues determined using 'bomb-(14)C' in three additional forest sites in North America and Europe (one deciduous, two coniferous) was less than 1-2 years. The effect of stored reserves on estimated ages of fine roots is unlikely to be large in most natural abundance isotope studies. However, models of root C dynamics should take stored reserves into account, particularly for pulse-labeling studies and fast-cycling roots (< 1 years).
Ämnesord
- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
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