Fire behaviour in a semi-arid Baikiaea plurijuga savanna woodland on Kalahari sands in western Zimbabwe
Fire behaviour in a semi-arid Baikiaea plurijuga savanna woodland on Kalahari sands in western Zimbabwe
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津巴布韦西部卡拉哈里沙漠半干旱Baikiaea plurijuga稀树草原林地的火灾行为
DOI：
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发表时间：
2005
影响因子：
2.4
通讯作者：
P. Frost
中科院分区：
文献类型：
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作者：
J. Gambiza;B. Campbell;S. Moe;P. Frost
上午的相对湿度一般高于下午晚些时候，而环境温度则相反。旱季后期相对湿度低于旱季前期。相比之下，热带稀树草原旱季初期的风速一般低于旱季中期或后期。火势蔓延速度在0.01-0.35m S-1之间。火的强度和蔓延速度与火焰高度、烧焦高度和烧毁面积比例呈正相关。这些关系表明，可以使用焦烧高度等变量来回溯确定火灾特征。草地燃料负荷、风速、相对湿度和次要的燃料水分是影响火势蔓延速度、火焰高度、焦叶高度和燃烧面积比例的重要因子，凋落物燃料负荷对其影响不大。草燃料负荷和风速对扩散速度有正向影响，相对湿度和燃料湿度对扩散速度有负影响。这些发现表明，管理者可以通过评估燃烧时的草燃料负荷和天气条件来预测早期旱季燃烧对木本植物可能造成的损害。
Relative humidity in the morning is generally higher than in the late afternoon, whereas ambient temperature is the opposite. Relative humidity during the late dry season is lower than in the early dry season. In contrast, wind speed during the early dry season is generally lower than in the mid or late dry season in savannas. 13 -1 , while rate of spread of fire varied between 0.01 and 0.35 m s -1 . Fire intensity and rate of spread were positively related to flame height, leaf-scorch height and proportion of the area burnt. The relationships suggest that fire characteristics can be retrospectively determined using a variable such as scorch height. The grass fuel load, wind speed, relative humidity and to a lesser extent fuel moisture were important predictors of rate of spread, flame height, leaf-scorch height and proportion of the area burnt, with no impact due to the litter fuel load. The grass fuel load and wind speed had a positive effect on rate of spread, whereas relative humidity and fuel moisture had a negative effect. These findings indicate that managers can predict the likely damage to woody plants during an early dry season burn by assessing the grass fuel load and weather conditions at the time of burning.