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The influence of N load and harvest intensity on the risk of P limitation in Swedish forest soils

Akselsson, Cecilia; Westling, Olle; Alveteg, Mattias LU ; Thelin, Gunnar LU ; Fransson, Ann-Mari LU and Hellsten, Sofie (2008) 5th International Symposium on Ecosystem Behavior In SCIENCE OF THE TOTAL ENVIRONMENT 404(2-3). p.284-289
Abstract
Nitrogen (N) is often considered to be the major factor limiting tree growth in northern forest ecosystems. An increased N availability, however, increases the demand for other nutrients such as base cations and phosphorous (P) which in turn may change which nutrient is the limiting factor. If P or base cations become limiting, N will start to leach which means a risk of increased eutrophication of surface waters. As many studies focus on base cations, this study instead aims at estimating P budgets on a regional scale for different harvesting scenarios relevant for Swedish conditions. P budget calculations were carried out for 14,550 coniferous sites from the Swedish National Forest Inventory, as weathering+deposition-harvesting-leaching.... (More)
Nitrogen (N) is often considered to be the major factor limiting tree growth in northern forest ecosystems. An increased N availability, however, increases the demand for other nutrients such as base cations and phosphorous (P) which in turn may change which nutrient is the limiting factor. If P or base cations become limiting, N will start to leach which means a risk of increased eutrophication of surface waters. As many studies focus on base cations, this study instead aims at estimating P budgets on a regional scale for different harvesting scenarios relevant for Swedish conditions. P budget calculations were carried out for 14,550 coniferous sites from the Swedish National Forest Inventory, as weathering+deposition-harvesting-leaching. Three scenarios with different harvest intensities were used: 1) no harvesting, 2) stem harvesting and 3) whole-tree harvesting. The input data were derived from measurements and model results. The P budget estimates indicate that harvesting, especially whole-tree harvesting, result in net losses of P in large parts of Sweden. The highest losses were found in southern Sweden due to high growth rate in this area. In the whole-tree harvesting scenario the losses exceeded 1 kg ha(-1)y(-1) on many sites. N budget calculations on the same sites indicate that N generally accumulates in the whole country and especially in the southern parts. Consequently, the N and P budget calculations indicate that the forests in southern Sweden are in a transition phase from N-to P-limitation to growth. This transition will proceed as long as the accumulation of N continues. These results are important in a sustainable forestry context, as a basis for assessing the risk of future N leaching, and in designing recommendations for abatement strategies of N deposition and for application of wood ash recycling and N fertilization. (C) 2007 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Harvesting, Sweden, Forest soils, Budget, Phosphorous, Nitrogen, Weathering
in
SCIENCE OF THE TOTAL ENVIRONMENT
volume
404
issue
2-3
pages
284 - 289
publisher
Elsevier
conference name
5th International Symposium on Ecosystem Behavior
external identifiers
  • wos:000260701900009
  • scopus:52949122187
ISSN
0048-9697
1879-1026
DOI
10.1016/j.scitotenv.2007.11.017
language
English
LU publication?
yes
id
dbc8d14b-6a55-4165-b9e4-c8d4b41eba8d (old id 1278957)
date added to LUP
2009-02-10 13:46:14
date last changed
2017-09-10 03:43:00
@inproceedings{dbc8d14b-6a55-4165-b9e4-c8d4b41eba8d,
  abstract     = {Nitrogen (N) is often considered to be the major factor limiting tree growth in northern forest ecosystems. An increased N availability, however, increases the demand for other nutrients such as base cations and phosphorous (P) which in turn may change which nutrient is the limiting factor. If P or base cations become limiting, N will start to leach which means a risk of increased eutrophication of surface waters. As many studies focus on base cations, this study instead aims at estimating P budgets on a regional scale for different harvesting scenarios relevant for Swedish conditions. P budget calculations were carried out for 14,550 coniferous sites from the Swedish National Forest Inventory, as weathering+deposition-harvesting-leaching. Three scenarios with different harvest intensities were used: 1) no harvesting, 2) stem harvesting and 3) whole-tree harvesting. The input data were derived from measurements and model results. The P budget estimates indicate that harvesting, especially whole-tree harvesting, result in net losses of P in large parts of Sweden. The highest losses were found in southern Sweden due to high growth rate in this area. In the whole-tree harvesting scenario the losses exceeded 1 kg ha(-1)y(-1) on many sites. N budget calculations on the same sites indicate that N generally accumulates in the whole country and especially in the southern parts. Consequently, the N and P budget calculations indicate that the forests in southern Sweden are in a transition phase from N-to P-limitation to growth. This transition will proceed as long as the accumulation of N continues. These results are important in a sustainable forestry context, as a basis for assessing the risk of future N leaching, and in designing recommendations for abatement strategies of N deposition and for application of wood ash recycling and N fertilization. (C) 2007 Elsevier B.V. All rights reserved.},
  author       = {Akselsson, Cecilia and Westling, Olle and Alveteg, Mattias and Thelin, Gunnar and Fransson, Ann-Mari and Hellsten, Sofie},
  booktitle    = {SCIENCE OF THE TOTAL ENVIRONMENT},
  issn         = {0048-9697},
  keyword      = {Harvesting,Sweden,Forest soils,Budget,Phosphorous,Nitrogen,Weathering},
  language     = {eng},
  number       = {2-3},
  pages        = {284--289},
  publisher    = {Elsevier},
  title        = {The influence of N load and harvest intensity on the risk of P limitation in Swedish forest soils},
  url          = {http://dx.doi.org/10.1016/j.scitotenv.2007.11.017},
  volume       = {404},
  year         = {2008},
}