中文摘要：

森林防火人员需要关注可燃物从雨后不燃变为可燃所需的时间和其后蔓延速率倍增所需的时间。这两个时间与可燃物失水速率直接相关,也会受风速影响。但关于风速对这些时间的影响还没有直接研究。为此,以红松针叶床层为研究对象,研究其在近恒温湿条件下不同风速时的失水过程,分析风速对这两个失水时间的影响,结果表明,在温度近20℃,湿度在25%~35%的条件下,有风条件显著减少了红松针叶床层从雨后不燃（含水率70%）到可燃所需的时间,时间可缩短1~1.3 h,减少比例近40%,最长可缩短5.2 h。但不同风速所缩短的时间差异不大。风的这种影响与红松针叶床层的密实度有关。风的影响可用风速的指数函数形式来描述。但风对于以0.3 g·g^-1为基点的蔓延速率倍增所需时间无显著影响。

英文摘要：

Two times concerned by forest fire managers are the time required for fuel to become ignitable from non-ignitable status after rain and the time required to increase its spread rate by one time. These times have been related with fuel drying rate. Generally speaking, wind affect fuel drying rate and should affect the two times. Although some works have been conducted on effects of wind on fuel moisture dynamics, no answers have ever been given to the question that to what extent wind can reduce the two times. Drying processes of fuelbeds composed of Korean pine needles were observed under nearly constant temperature and humidity but varied wind speeds. The two times of the processes were measured and effects of wind speed on the times investigated. Results show that under nearly 20℃ and 25%-30% humidity conditions, wind speed, fuelbed compactness and their interaction all have influences on the first time but not on the second time with benchmark set at fire spread rate of fuelbed with moisture content of 0.3 g.g^-1. Wind speed reduced the first time by 1-1.3 h, nearly 40% of the time at zero wind speed condition. The relationship between the time and wind speed can be depicted by a exponential function. A fitting function combining wind speed and fuelbed compactness was also established with satisfied accuracy.