武夷山市林火时空格局及其与气象因子的关系

Temporal and spatial patterns of forest fires in Wuyishan City and their relationship with meteorological factors

基于1999—2013年武夷山市林火统计数据及其相应的气象数据,运用描述性统计法、点格局分析法、皮尔森相关性分析法、线性回归法及主成分分析法对武夷山市林火进行时空动态研究,并探讨其林火发生次数与年气象因子的关系。结果表明:(1) 1999—2013年武夷山市累计发生火灾74次,过火面积1 398.36 hm^2,林火发生次数与过火面积均呈下降趋势;(2)冬、春季节是武夷山市林火高发期,特别是12月至翌年4月最为严重,且林火在空间尺度上呈现聚集分布,主要集中在中部的崇安街道、新丰街道、武夷街道和南部的兴田镇;(3)林火发生仅与年降水量线性相关(r=-0.613; P<0.05),年均气温及相对湿度对林火也有较大影响,但不构成线性关系。

Based on the statistics of forest fires in Wuyishan City from1999to2013and their corresponding meteorological data,descriptive statistics,point pattern analysis,Pearson correlation analysis,linear regression and principal component analysis were used to carry out a time and space dynamics research study on the forest fires in Wuyishan City.The relationship between the number of forest fire occurrence and annual meteorological factors was also explored.The results showed as followed.(1)From1999to2013,there were74fires in Wuyishan City with a total fire area of1398.36hm^2.The number of fires and the area of fires showed a downward trend.(2)The winter and spring seasons had high incidences of forest fires in Wuyishan City,especially during December to April of the following year.The forest fires were clustered on the spatial scale,mainly concentrated in Chong'an Street,Xinfeng Street,and Wuyi Street in the middle of Wuyishan,and Xingtian Town in the south of Wuyishan.(3)Forest fire occurrence was only linearly related to annual precipitation(r=-0.613;P<0.05).The annual average temperature and relative humidity also had a larger effect on forest fire,but it did not constitute a linear relationship.