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Consequences of intensive forest harvesting on the recovery of Swedish lakes from acidification and on critical load exceedances

Moldan, Filip; Stadmark, Johanna LU ; Fölster, Jens; Jutterström, Sara; Futter, Martyn N.; Cosby, Bernard J. and Wright, Richard F. (2017) In Science of the Total Environment 603-604. p.562-569
Abstract

Across much of the northern hemisphere, lakes are at risk of re-acidification due to incomplete recovery from historical acidification and pressures associated with more intensive forest biomass harvesting. Critical load (CL) calculations aimed at estimating the amount of pollutants an ecosystem can receive without suffering adverse consequences are dependent on these factors. Here, we present a modelling study of the potential effects of intensified forest harvesting on re-acidification of a set of 3239 Swedish lakes based on scenarios with varying intensities of forest biomass harvest and acid deposition. There is some evidence that forestry would have caused a certain level of acidification even if deposition remained at 1860 levels.... (More)

Across much of the northern hemisphere, lakes are at risk of re-acidification due to incomplete recovery from historical acidification and pressures associated with more intensive forest biomass harvesting. Critical load (CL) calculations aimed at estimating the amount of pollutants an ecosystem can receive without suffering adverse consequences are dependent on these factors. Here, we present a modelling study of the potential effects of intensified forest harvesting on re-acidification of a set of 3239 Swedish lakes based on scenarios with varying intensities of forest biomass harvest and acid deposition. There is some evidence that forestry would have caused a certain level of acidification even if deposition remained at 1860 levels. We show that all plausible harvest scenarios delay recovery due to increased rates of base cation removal. Scenario results were used to estimate critical loads for the entire population of lakes in Sweden. The forestry intensity included in critical load calculations is a political decision. After scaling calculations to the national level, it was apparent that a high but plausible forest harvest intensity would lead to an increase in the area of CL exceedances and that even after significant reductions in forest harvest intensity, there would still be areas with CL exceedances. Our results show that forest harvest intensity and regional environmental change must be carefully considered in future CL calculations.

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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Leaching, MAGIC model, Silviculture, Surface waters
in
Science of the Total Environment
volume
603-604
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:85021145216
ISSN
0048-9697
DOI
10.1016/j.scitotenv.2017.06.013
language
English
LU publication?
no
id
820b365a-8612-4100-acd4-8e478ab1810f
date added to LUP
2019-01-14 14:38:38
date last changed
2019-01-23 11:13:07
@article{820b365a-8612-4100-acd4-8e478ab1810f,
  abstract     = {<p>Across much of the northern hemisphere, lakes are at risk of re-acidification due to incomplete recovery from historical acidification and pressures associated with more intensive forest biomass harvesting. Critical load (CL) calculations aimed at estimating the amount of pollutants an ecosystem can receive without suffering adverse consequences are dependent on these factors. Here, we present a modelling study of the potential effects of intensified forest harvesting on re-acidification of a set of 3239 Swedish lakes based on scenarios with varying intensities of forest biomass harvest and acid deposition. There is some evidence that forestry would have caused a certain level of acidification even if deposition remained at 1860 levels. We show that all plausible harvest scenarios delay recovery due to increased rates of base cation removal. Scenario results were used to estimate critical loads for the entire population of lakes in Sweden. The forestry intensity included in critical load calculations is a political decision. After scaling calculations to the national level, it was apparent that a high but plausible forest harvest intensity would lead to an increase in the area of CL exceedances and that even after significant reductions in forest harvest intensity, there would still be areas with CL exceedances. Our results show that forest harvest intensity and regional environmental change must be carefully considered in future CL calculations.</p>},
  author       = {Moldan, Filip and Stadmark, Johanna and Fölster, Jens and Jutterström, Sara and Futter, Martyn N. and Cosby, Bernard J. and Wright, Richard F.},
  issn         = {0048-9697},
  keyword      = {Leaching,MAGIC model,Silviculture,Surface waters},
  language     = {eng},
  month        = {12},
  pages        = {562--569},
  publisher    = {Elsevier},
  series       = {Science of the Total Environment},
  title        = {Consequences of intensive forest harvesting on the recovery of Swedish lakes from acidification and on critical load exceedances},
  url          = {http://dx.doi.org/10.1016/j.scitotenv.2017.06.013},
  volume       = {603-604},
  year         = {2017},
}