基于MODIS数据的2001—2015年江西省林火时空特征分析

Analysis on temporal and spatial characteristics of forest fires in Jiangxi province based on MODIS Data from 2001 to 2015

基于MODIS火产品数据(MCD14ML),采用数理统计、空间分析和信息熵理论,研究了江西省2001—2015年林火发生的时空分布特征。结果表明:2001—2015年江西省林火发生的年际波动较大,其中在2004年和2008年出现两个高峰值;季节性变化明显,主要集中在冬季和春季;林火发生有3个显著的空间热点区,分别位于赣州市西南部、吉安市西北部和抚州市南部;林火时空综合分布为聚集模式,且聚集程度较高。可见,在区域尺度上林火的发生不是完全随机分布的,而是呈现出显著的时空聚集性特征。林业部门需要重视对林火聚集分布的赣中南地区的监测和管理,并加强防火宣传力度,以提升民众的森林防火意识。

Based on MODIS fire product data（ MCD14 ML）,this paper analyzed the spatial-temporal distribution characteristics of forest fires in Jiangxi province from 2001 to 2015 using mathematical statistics,spatial analysis and information entropy theory. The results showed that the number of fire occurrence had an evident interannual fluctuation,which were two peaks in 2004 and 2008. Forest fires varied seasonally,mainly occurred in winter and spring;there were three obvious hot-spots of fire occurrence,which were located at southwestern Ganzhou city,northwestern Ji＇an city,and southern Fuzhou city. The spatial-temporal comprehensive distribution of forest fires presented a high-level aggregation pattern. It could be seen that the occurrence of forest fires on the regional scale was not completely random,on the contrary,it presented significant spatial-temporal aggregation characteristics.Forest managers should pay more attention to monitor fires in central and southern Jiangxi province,where forest fires were aggregately distributed. In practical,local managers should take various measures to strengthen fire prevention publicity and enhance the people＇s awareness of forest fire prevention.