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Effects of slash retention and wood ash addition on fine root biomass and production and fungal mycelium in a Norway spruce stand in SW Sweden

Majdi, Hooshang; Truus, Laimi; Johansson, Ulf; Nylund, Jan-Erik and Wallander, Håkan LU (2008) In Forest Ecology and Management 255(7). p.2109-2117
Abstract
In the study reported here we examined the short-term effects (1-3 years) of slash retention (SR) and the long-term effects (13-15 years) of wood-ash application (A) on fine roots and mycorrhizae in a 40-year-old Norway spruce forest in southwest Sweden. Soil cores were used to obtain estimates of the biomass (g m(-2)) of roots in three diameter classes (< 0.5, 0.5-1 and 1-2 mm), root length density (RLD), specific root length (SRL) and mycorrhizal root tip density (RTD). Fine root (< 1 mm) length production and mortality, and mycelium production, were estimated using minirhizotron and mesh bag techniques, respectively. Compared with the control plots (C), the biomass of fine roots in diameter classes < 0.5 mm and 0.5-1 mm was... (More)
In the study reported here we examined the short-term effects (1-3 years) of slash retention (SR) and the long-term effects (13-15 years) of wood-ash application (A) on fine roots and mycorrhizae in a 40-year-old Norway spruce forest in southwest Sweden. Soil cores were used to obtain estimates of the biomass (g m(-2)) of roots in three diameter classes (< 0.5, 0.5-1 and 1-2 mm), root length density (RLD), specific root length (SRL) and mycorrhizal root tip density (RTD). Fine root (< 1 mm) length production and mortality, and mycelium production, were estimated using minirhizotron and mesh bag techniques, respectively. Compared with the control plots (C), the biomass of fine roots in diameter classes < 0.5 mm and 0.5-1 mm was significantly higher in A plots, but lower in SR plots. In addition, RLD was significantly lower in the humus layer of SR plots than in the humus layers of C and A plots, but not in the other layers. None of the treatments affected the SRL. In all soil layers, the SR treatment resulted in significant reductions in the number of ectomycorrhizal root tips, and the mycelia production of fungi in mesh bags, relative to the C treatment, but the C and A treatments induced no significant changes in these variables. Fine root length production in the C, A and SR plots amounted to 94, 87 and 70 turn tube(-1) during the 2003 growing season, respectively. Fine root mortality in treated plots did not change over the course of the study. We suggest that leaving logging residues on fertile sites may result in nitrogen mineralisation, which may in turn induce reductions in root biomass, and both root and mycelium production, and consequently affect nutrient uptake and the accumulation of organic carbon in soil derived from roots and mycorrhizae. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
minirhizotrons, wood ash, cores, soil, slash retention, production, mycelium, fine roots, mortality
in
Forest Ecology and Management
volume
255
issue
7
pages
2109 - 2117
publisher
Elsevier
external identifiers
  • wos:000256143900010
  • scopus:42049119862
ISSN
1872-7042
DOI
10.1016/j.foreco.2007.12.017
language
English
LU publication?
yes
id
dd13a58e-72e9-400a-a886-f60a07380593 (old id 1201743)
date added to LUP
2008-09-15 12:50:56
date last changed
2017-07-30 04:16:04
@article{dd13a58e-72e9-400a-a886-f60a07380593,
  abstract     = {In the study reported here we examined the short-term effects (1-3 years) of slash retention (SR) and the long-term effects (13-15 years) of wood-ash application (A) on fine roots and mycorrhizae in a 40-year-old Norway spruce forest in southwest Sweden. Soil cores were used to obtain estimates of the biomass (g m(-2)) of roots in three diameter classes (&lt; 0.5, 0.5-1 and 1-2 mm), root length density (RLD), specific root length (SRL) and mycorrhizal root tip density (RTD). Fine root (&lt; 1 mm) length production and mortality, and mycelium production, were estimated using minirhizotron and mesh bag techniques, respectively. Compared with the control plots (C), the biomass of fine roots in diameter classes &lt; 0.5 mm and 0.5-1 mm was significantly higher in A plots, but lower in SR plots. In addition, RLD was significantly lower in the humus layer of SR plots than in the humus layers of C and A plots, but not in the other layers. None of the treatments affected the SRL. In all soil layers, the SR treatment resulted in significant reductions in the number of ectomycorrhizal root tips, and the mycelia production of fungi in mesh bags, relative to the C treatment, but the C and A treatments induced no significant changes in these variables. Fine root length production in the C, A and SR plots amounted to 94, 87 and 70 turn tube(-1) during the 2003 growing season, respectively. Fine root mortality in treated plots did not change over the course of the study. We suggest that leaving logging residues on fertile sites may result in nitrogen mineralisation, which may in turn induce reductions in root biomass, and both root and mycelium production, and consequently affect nutrient uptake and the accumulation of organic carbon in soil derived from roots and mycorrhizae.},
  author       = {Majdi, Hooshang and Truus, Laimi and Johansson, Ulf and Nylund, Jan-Erik and Wallander, Håkan},
  issn         = {1872-7042},
  keyword      = {minirhizotrons,wood ash,cores,soil,slash retention,production,mycelium,fine roots,mortality},
  language     = {eng},
  number       = {7},
  pages        = {2109--2117},
  publisher    = {Elsevier},
  series       = {Forest Ecology and Management},
  title        = {Effects of slash retention and wood ash addition on fine root biomass and production and fungal mycelium in a Norway spruce stand in SW Sweden},
  url          = {http://dx.doi.org/10.1016/j.foreco.2007.12.017},
  volume       = {255},
  year         = {2008},
}