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Wind disturbance in mountain forests: Simulating the impact of management strategies, seed supply, and ungulate browsing on forest succession

Rammig, Anja LU ; Fahse, Lorenz; Bebi, Peter and Bugmann, Harald (2007) In Forest Ecology and Management 242(2-3). p.142-154
Abstract
Fifteen years after the heavy storm "Vivian", it is still not clear how succession in subalpine forests that were affected by the storm will continue and when regrowing forests will provide effective protection from natural hazards such as avalanches. We used a simulation model to evaluate forest succession, forest structure and the protective effect in subalpine blowdown areas after 50 simulation years under different scenarios. The scenarios included the effects of different management strategies such as clearing the fallen logs or leaving the sites untouched ("uncleared"), variations in seed supply, and ungulate browsing. The simulation results indicated that forest structure was heterogeneous after 50 years, with a high amount of trees... (More)
Fifteen years after the heavy storm "Vivian", it is still not clear how succession in subalpine forests that were affected by the storm will continue and when regrowing forests will provide effective protection from natural hazards such as avalanches. We used a simulation model to evaluate forest succession, forest structure and the protective effect in subalpine blowdown areas after 50 simulation years under different scenarios. The scenarios included the effects of different management strategies such as clearing the fallen logs or leaving the sites untouched ("uncleared"), variations in seed supply, and ungulate browsing. The simulation results indicated that forest structure was heterogeneous after 50 years, with a high amount of trees between 11 and 100 cm hei-ht, and a low amount of trees taller than I m. The number of trees > 5 m, which is important for the protective effect of a site, was lower at uncleared areas if the area was covered with high amounts of fallen logs, but diversity of microsites was higher than at cleared areas. We found that it is particularly important that abundant seed supply occurs within the first few years after the blowdown at cleared sites, because in later stages there was high competition by tall herbs, which prevented the establishment of tree regeneration. Larger time lags between seed years in the simulations led to retarded tree regeneration. Particularly at cleared sites, ungulate browsing retarded tree regeneration. In contrast, uncleared sites had a higher potential to recover from high browsing pressure due to a high amount of favourable microsites that are provided by decaying logs. These results of our model simulations may help understanding the dynamics of forest regeneration and providing perspectives for management after blowdown events. (C) 2007 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ecosystem Services, risk analysis, protection forest, forest, mountain, disturbance, Norway spruce, blowdown, regeneration model
in
Forest Ecology and Management
volume
242
issue
2-3
pages
142 - 154
publisher
Elsevier
external identifiers
  • wos:000246268100007
  • scopus:34047099710
ISSN
1872-7042
DOI
10.1016/j.foreco.2007.01.036
language
English
LU publication?
yes
id
5e6532a1-04d6-42a1-b3e5-5a5ad2b22da0 (old id 659618)
date added to LUP
2007-12-19 09:52:56
date last changed
2017-10-22 04:45:34
@article{5e6532a1-04d6-42a1-b3e5-5a5ad2b22da0,
  abstract     = {Fifteen years after the heavy storm "Vivian", it is still not clear how succession in subalpine forests that were affected by the storm will continue and when regrowing forests will provide effective protection from natural hazards such as avalanches. We used a simulation model to evaluate forest succession, forest structure and the protective effect in subalpine blowdown areas after 50 simulation years under different scenarios. The scenarios included the effects of different management strategies such as clearing the fallen logs or leaving the sites untouched ("uncleared"), variations in seed supply, and ungulate browsing. The simulation results indicated that forest structure was heterogeneous after 50 years, with a high amount of trees between 11 and 100 cm hei-ht, and a low amount of trees taller than I m. The number of trees > 5 m, which is important for the protective effect of a site, was lower at uncleared areas if the area was covered with high amounts of fallen logs, but diversity of microsites was higher than at cleared areas. We found that it is particularly important that abundant seed supply occurs within the first few years after the blowdown at cleared sites, because in later stages there was high competition by tall herbs, which prevented the establishment of tree regeneration. Larger time lags between seed years in the simulations led to retarded tree regeneration. Particularly at cleared sites, ungulate browsing retarded tree regeneration. In contrast, uncleared sites had a higher potential to recover from high browsing pressure due to a high amount of favourable microsites that are provided by decaying logs. These results of our model simulations may help understanding the dynamics of forest regeneration and providing perspectives for management after blowdown events. (C) 2007 Elsevier B.V. All rights reserved.},
  author       = {Rammig, Anja and Fahse, Lorenz and Bebi, Peter and Bugmann, Harald},
  issn         = {1872-7042},
  keyword      = {Ecosystem Services,risk analysis,protection forest,forest,mountain,disturbance,Norway spruce,blowdown,regeneration model},
  language     = {eng},
  number       = {2-3},
  pages        = {142--154},
  publisher    = {Elsevier},
  series       = {Forest Ecology and Management},
  title        = {Wind disturbance in mountain forests: Simulating the impact of management strategies, seed supply, and ungulate browsing on forest succession},
  url          = {http://dx.doi.org/10.1016/j.foreco.2007.01.036},
  volume       = {242},
  year         = {2007},
}