The Estimation Of Temporal And Spatial
Fluctuations In A Forest Fire Hazard Index –
The Case Of A Forested Public Area In Japan
Author(s)
K. Tamai & Y. Goto
Abstract
Few studies have estimated the risk of forest fire in individual forest stands using
forest data, such as the leaf area index. Mapped estimates of the risk of forest fire
would benefit forest management, and could be used to decide restrictions on the
public use of forest areas.
In this study, the litter moisture content ratio was predicted with this model
and forest fire hazard was estimated in Tatsunokuchi-yama Green Shower Park,
with around 40ha forested area for 2 litter drying periods as a trial. This park is
located in central Japan. The model was adapted to the area of around 40ha in
this park classified into 9 stands with tree height, tree species and slope direction.
The solar radiation on the forest floor and surface soil moisture at 5cm depth
was recorded in each stand. Precipitation above the canopy was measured with a
rain gauge at a weather station in the base area of the Park.
Litter moisture was simulated every 30minutes. Fuel moisture decreased with
litter drying speed for each forest stand among simulated days depending on the
solar radiation on the each stand floor. Firstly, the simulated result in the
defoliate period (24 February–3 May, 2005) is discussed. Litter moisture was
less than 0.2g g-1 and fire risk is judged to be highest in 7 out of the 9 forest
stands on 2 May. On the other hand, spatial variation of litter moistue was widest
at 0.198–0.811g g-1 on 27 February. This means that the litter drying speed and
fire risk is different for each forest stand. Thus, it is significant to construct the
forest fire warning system for each forest stand and to manage people’s activities
in this public forested area to prevent forest fire.
Keywords: water budget, solar radiation, forest stand, public forest.
Keywords
water budget, solar radiation, forest stand, public forest.
Related Book
Other papers in this volume
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