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High temporal resolution tracing of photosynthate carbon from the tree canopy to forest soil microorganisms

Hogberg, P.; Hogberg, M. N.; Gottlicher, S. G.; Betson, N. R.; Keel, S. G.; Metcalfe, Dan LU ; Campbell, C.; Schindlbacher, A.; Hurry, V. and Lundmark, T., et al. (2008) In New Phytologist 177(1). p.220-228
Abstract
Half of the biological activity in forest soils is supported by recent tree photosynthate, but no study has traced in detail this flux of carbon from the canopy to soil microorganisms in the field. Using (CO2)-C-13, we pulse-labelled over 1.5 h a 50-m(2) patch of 4-m-tall boreal Pinus sylvestris forest in a 200-m(3) chamber. Tracer levels peaked after 24 h in soluble carbohydrates in the phloem at a height of 0.3 m, after 2-4 d in soil respiratory efflux, after 4-7 d in ectomycorrhizal roots, and after 2-4 d in soil microbial cytoplasm. Carbon in the active pool in needles, in soluble carbohydrates in phloem and in soil respiratory efflux had half-lives of 22, 17 and 35 h, respectively. Carbon in soil microbial cytoplasm had a half-life of... (More)
Half of the biological activity in forest soils is supported by recent tree photosynthate, but no study has traced in detail this flux of carbon from the canopy to soil microorganisms in the field. Using (CO2)-C-13, we pulse-labelled over 1.5 h a 50-m(2) patch of 4-m-tall boreal Pinus sylvestris forest in a 200-m(3) chamber. Tracer levels peaked after 24 h in soluble carbohydrates in the phloem at a height of 0.3 m, after 2-4 d in soil respiratory efflux, after 4-7 d in ectomycorrhizal roots, and after 2-4 d in soil microbial cytoplasm. Carbon in the active pool in needles, in soluble carbohydrates in phloem and in soil respiratory efflux had half-lives of 22, 17 and 35 h, respectively. Carbon in soil microbial cytoplasm had a half-life of 280 h, while the carbon in ectomycorrhizal root tips turned over much more slowly. Simultaneous labelling of the soil with (NH4+)-N-15 showed that the ectomycorrhizal roots, which were the strongest sinks for photosynthate, were also the most active sinks for soil nitrogen. These observations highlight the close temporal coupling between tree canopy photosynthesis and a significant fraction of soil activity in forests. (Less)
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type
Contribution to journal
publication status
published
subject
keywords
carbon, forests, mycorrhiza, photosynthesis, plant allocation, Scots, pine, soil microorganisms
in
New Phytologist
volume
177
issue
1
pages
220 - 228
publisher
Wiley-Blackwell
external identifiers
  • wos:000251416600022
  • scopus:36849024556
ISSN
1469-8137
DOI
10.1111/j.1469-8137.2007.02238.x
language
English
LU publication?
no
id
f1f2ecc1-fafb-4bf1-b4b5-990f15be6ed9 (old id 4644091)
date added to LUP
2014-09-23 15:18:16
date last changed
2017-11-12 03:17:50
@article{f1f2ecc1-fafb-4bf1-b4b5-990f15be6ed9,
  abstract     = {Half of the biological activity in forest soils is supported by recent tree photosynthate, but no study has traced in detail this flux of carbon from the canopy to soil microorganisms in the field. Using (CO2)-C-13, we pulse-labelled over 1.5 h a 50-m(2) patch of 4-m-tall boreal Pinus sylvestris forest in a 200-m(3) chamber. Tracer levels peaked after 24 h in soluble carbohydrates in the phloem at a height of 0.3 m, after 2-4 d in soil respiratory efflux, after 4-7 d in ectomycorrhizal roots, and after 2-4 d in soil microbial cytoplasm. Carbon in the active pool in needles, in soluble carbohydrates in phloem and in soil respiratory efflux had half-lives of 22, 17 and 35 h, respectively. Carbon in soil microbial cytoplasm had a half-life of 280 h, while the carbon in ectomycorrhizal root tips turned over much more slowly. Simultaneous labelling of the soil with (NH4+)-N-15 showed that the ectomycorrhizal roots, which were the strongest sinks for photosynthate, were also the most active sinks for soil nitrogen. These observations highlight the close temporal coupling between tree canopy photosynthesis and a significant fraction of soil activity in forests.},
  author       = {Hogberg, P. and Hogberg, M. N. and Gottlicher, S. G. and Betson, N. R. and Keel, S. G. and Metcalfe, Dan and Campbell, C. and Schindlbacher, A. and Hurry, V. and Lundmark, T. and Linder, S. and Nasholm, T.},
  issn         = {1469-8137},
  keyword      = {carbon,forests,mycorrhiza,photosynthesis,plant allocation,Scots,pine,soil microorganisms},
  language     = {eng},
  number       = {1},
  pages        = {220--228},
  publisher    = {Wiley-Blackwell},
  series       = {New Phytologist},
  title        = {High temporal resolution tracing of photosynthate carbon from the tree canopy to forest soil microorganisms},
  url          = {http://dx.doi.org/10.1111/j.1469-8137.2007.02238.x},
  volume       = {177},
  year         = {2008},
}