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林火是森林生态系统重要干扰因子并对大气环境和人类健康有显著影响.该研究基于2000—2014年中国亚热带地区卫星火点数据,结合林业统计年鉴,估算各区域林火燃烧生物量,运用排放因子法,估算15年间中国亚热带地区林火排放颗粒物总量.研究结果表明,亚热带地区林火存在季节性差异,福建、广东、广西、湖南和江西林火主要集中在春、秋两季;贵州和云南林火主要集中在春季;浙江林火集中在春、夏两季.亚热带地区森林可燃物总燃烧量为333.92 Mt,污染物PM2.5、OC、EC和TC总量分别为:698.33、338.18、40.04和378.22 kt,此外,各污染物排放在时间和空间上不均衡,各污染物排放量多集中在云南南部和东南部,湖南、贵州和广东交汇处,广东东南部和福建中部等区域;PM2.5、OC、EC和TC在浙江、云南、贵州、湖南和江西呈显著增长趋势.林火释放PM2.5与工业粉尘的排放比变化趋势总体呈上升趋势,说明森林火灾导致的颗粒物排放对大气环境影响力呈逐年增长趋势.该文通过对中国亚热带地区林火释放污染物的时空变化研究,为深入揭示林火对区域环境的影响提供数据支持.
Forest fire is an important disturbance factor of forest ecosystem and has a significant impact on the atmospheric environment and human health.This study estimated the biomass of forest fires burning in different regions based on satellite fire point data of China’s subtropical regions from 2000 to 2014 and forestry statistical yearbook The results show that there are seasonal differences in forest fires in subtropical regions, while the fires in Fujian, Guangdong, Guangxi, Hunan and Jiangxi are mainly concentrated in spring and autumn. The forest fires in Guizhou and Yunnan mainly concentrated in the spring, while the forest fires in Zhejiang were concentrated in the spring and summer. The total combustibles burned in the subtropical area were 333.92 Mt and the total PM2.5, OC, EC and TC pollutants were 698.33 , 338.18, 40.04 and 378.22 kt respectively. In addition, the discharge of pollutants was not balanced in time and space. The discharge of pollutants was mainly concentrated in the south and southeast of Yunnan, the confluence of Hunan, Guizhou and Guangdong, southeastern Guangdong and central Fujian Etc. PM2.5, OC, EC and TC showed a significant increase trend in Zhejiang, Yunnan, Guizhou, Hunan and Jiangxi.The trend of release ratio of PM2.5 and industrial dust released by forest fire The body upward trend indicates that the influence of particulate matter emission caused by forest fire on the atmospheric environment is increasing year by year.Based on the research on the spatial and temporal changes of pollutants released by forest fires in the subtropical regions in China, data support.