SOIL AND AIR TEMPERATURES DURING PRESCRIBED CERRADO FIRES IN CENTRAL BRAZIL
SOIL AND AIR TEMPERATURES DURING PRESCRIBED CERRADO FIRES IN CENTRAL BRAZIL
复制标题
DOI：
10.1017/s0266467400007367
复制
发表时间：
1993-08-01
影响因子：
1.4
通讯作者：
DIAS, BFD
中科院分区：
文献类型：
--
作者：
MIRANDA, AC;MIRANDA, HS;DIAS, BFD
在旱季抽穗火灾期间，对巴西中部常见的三种不同地貌形式的本土植被进行了空气和土壤温度的测量：cerrado sensu stricto（灌木和乔木的茂密灌木丛）、campo cerrado（开阔的灌木丛）和campo sujo（散布着灌木的开阔草地）。一些地区的植被防火保护长达15年，每两年燃烧一次，其他地区每年燃烧一次。使用 k 型热电偶测量温度并以 22.5 秒的间隔记录。在 1、60 和 160 厘米处进行空气温度测量。最高气温范围为 85 摄氏度至 840 摄氏度，高于 60 摄氏度的持续时间为 20 至 270 秒。在土壤中，5 厘米深度以下记录的温度升高可以忽略不计，而在 2 厘米深度处，最高土壤温度为 29 至 38 摄氏度。讨论了燃料负荷和湿度对记录数据以及塞拉多生态系统火灾行为的可能影响。
Air and soil temperatures were measured during dry season heading fires in three different physiognomic forms of native vegetation common in Central Brazil: cerrado sensu stricto (dense scrub of shrubs and trees), campo cerrado (open scrub), and campo sujo (open grassland with scattered shrubs). The vegetation was protected from fire for 15 y in some areas, had been burned once every two years, and once each year in other areas. The temperatures were measured with type-k thermocouples and recorded at intervals of 22.5 secs. Air temperature measurements were taken at 1, 60 and 160 cm. Maximum air temperatures ranged from 85-degrees-C to 840-degrees-C, and the duration above 60-degrees-C varied from 20 to 270 seconds. In the soil, negligible temperature increases were recorded below 5 cm depth, whereas at 2 cm maximum soil temperatures varied from 29 to 38-degrees-C. Possible influences of fuel load and moisture on the recorded data and on the behaviour of fire in the cerrado ecosystems are discussed.