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Fuel properties and fire behaviour characteristics of prescribed fire in pine-dominated forests at Nam Nao National Park, Thailand

Author:
Wanthongchai, K., Tarusadamrongdet, V., Chinnawong, K., Sooksawat, K.
Source:
International journal of wildland fire 2013 v.22 no.5 pp. 615-624
ISSN:
1049-8001
Subject:
coniferous forests, ecosystems, fire behavior, forest fires, fuel loading, fuels, fuels (fire ecology), national parks, plant litter, prescribed burning, soil temperature, stand characteristics, surface temperature, sward, Thailand
Abstract:
Anthropogenic burning has become a common phenomenon throughout Thailand’s pine-dominated ecosystems. This study investigated fuel loads and experimental fire behaviour characteristics in a degraded pine forest (PF) and a pine–oak forest (O-PF), at Nam Nao National Park, Thailand in three replicate 50×50-m plots of each forest type. Pre-burn fuel loads, fire behaviour descriptors, fire and soil temperature, the residues left after burning and post-burn fuel recovery for 1 year were investigated. The aboveground fuel load in PF (1.29kgm-2) was significantly higher than in O-PF (0.87kgm-2). The main fuel components in the PF stand were grass (45%) and litter (44%), whereas leaf litter was the predominant fuel in the O-PF stand (55%). The fire behaviour characteristics in the PF stand were significantly greater than those in the O-PF stand. Burning at the O-PF and the PF was respectively classified as low (48kWm-1) and medium intensity (627kWm-1). During the burning experiment, the surface soil temperatures at all sites were higher than 250°C. However, fire did not cause temperature changes in the deeper soil layers. In the pine forest the post-burn fuel loads 1 year after the fire remained lower than the pre-burn level. These results may imply that a pine forest at Nam Nao National Park requires more than 1 year of fire-free period to recover back to the pre-burn conditions.
Agid:
601296