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Calibrating and Testing the Forest Vegetation Simulator to Simulate Tree Encroachment and Control Measures for Heathland Restoration in Southern Europe

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We used the Forest Vegetation Simulator (FVS) to simulate tree encroachment and tree control measures in a continental heathland in Southern Europe, where the goal is the conservation of Calluna vulgaris (L.) Hull. We selected as the management target a maximum tree basal area of 4.6 m2 ha−1, corresponding to a minimum Calluna cover of 25%, and modeled stand dynamics along a 50-year period under three management scenarios: no management; low-frequency prescribed burning; and low-frequency prescribed burning followed by annual grazing. We initialized and calibrated the Northeastern variant of FVS with data measured in the field and the Fire and Fuel Extension with additional data from a prescribed burning experiment. We carried out most calibrations by multipliers, including a novel way to simulate the impact of grazing on shoot height and survival. To simulate fire behavior, we designed a custom fire behavior fuel model for heath fuels. Successful validation of simulated stand-scale attributes and postfire mortality was carried out using equivalence testing. Model projections showed that stand basal area would exceed the target threshold under both the no-management and the prescribed burning scenario, 5 and 10 years into the simulation, respectively. Conversely, prescribed burning followed by yearly grazing successfully controlled encroaching trees throughout the simulation, by keeping their basal area below the threshold associated with the maintenance of the heathland cultural landscape.
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Keywords: Calluna vulgaris (L.) Hull; Fire and Fuel Extension; Forest Vegetation Simulator; grazing; prescribed burning

Document Type: Research Article

Publication date: 2014-04-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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