摘要
林火是生态系统重要干扰因子,对生态系统结构和功能有重要影响。本研究基于2005—2017年黑龙江和江西两省卫星火点数据并采用Mann-Kendall检验和滑动t检验的方法分析林火时空及火险期变化。结果表明:两省全年林火年际变化呈现先上升后下降的趋势;黑龙江省突变年份在2011年前后;江西省突变年份在2016年前后;江西省法定火险期设定较黑龙江省更加合理;黑龙江省林火主要发生在春秋两季,春季林火发生期有向早春偏移的趋势,秋季林火发生期向夏季偏移并延长,春、夏和秋三季突变年份分别为2010年、2014年和2011年,冬季无突变年份;江西省林火主要发生在冬季,林火发生期有向冬季偏移并缩短的趋势,春、夏、秋、冬四季突变年份分别为2010年、2015年、2014年和2016年前后;两省林火密度呈相反的递增趋势;黑龙江省林火密度由东南向西北呈递增趋势,集中于黑河市和大兴安岭地区;江西省林火密度由东北向西南呈递增趋势,集中于赣州市和吉安市;两省各地区林火次数整体均呈下降趋势;其中黑龙江省大庆市、佳木斯市和大兴安岭地区林火次数下降趋势显著;黑龙江省法定火险期伊春市和鸡西市林火次数呈上升趋势。本研究揭示了中国南北方林火的时空变化及南北两省火险期的偏移现象,为揭示林火对区域环境的影响和林火管理提供数据支持。
Fire is a critical disturbance factor in forests,with consequences on ecosystem structure and function.Based on the satellite fire point data in Heilongjiang and Jiangxi provinces of China from 2005 to 2017,we analyzed the spatial-temporal variations of fire occurrences and fire risk period using Mann-Kendall test and sliding t-test methods.The annual variation of forest fire occurrences in both provinces showed a trend of first rising and then falling.The mutation year of forest fire occurrences in Heilongjiang was around 2011 and that in Jiangxi was around 2016.The statutory fire risk period in Jiangxi was more reasonable than that in Heilongjiang.Forest fire in Heilongjiang mainly occurred in spring and autumn.The occurrence period of forest fire in spring shifted to early spring,and the occurrence period of forest fire in autumn shifted to summer and extended,the mutation years of spring,summer,and autumn were 2010,2014,and 2011 respectively,and there was no mutation year in winter.Forest fire in Jiangxi mainly occurred in winter,the occurrence period of forest fire tended to shift to winter and shortened,and the mutation years of spring,summer,autumn and winter were around 2010,2015,2014 and 2016,respectively.The density of forest fires in both provinces showed an opposite increasing trend in the spatial perspective.In Heilongjiang,the density of forest fires increased from southeast to northwest,dominantly distributed in Heihe(a northern city of the province)and Daxinganling(a northwest part of the province).In contrast,the density of forest fires increased from northeast to southwest in Jiangxi,concentrated in Ganzhou(a southern city of the province)and Ji’an(a southwest city of the province).The overall number of forest fires showed a downward trend in both provinces.The number of forest fires in Daqing,Jiamusi and Daxing’an Mountains in Heilongjiang had a significant downward trend,while the number of forest fires in Yichun and Jixi during the statutory fire danger period was on the rise.This study d
作者
朱贺
张珍
杨凇
朱忠盼
曾爱聪
郭福涛
ZHU He;ZHANG Zhen;YANG Song;ZHU Zhong-pan;ZENG Ai-cong;GUO Fu-tao(College of Forestry,Fujian Agriculture and Forestry University,Key Laboratory of 3S Technology and Optimal Utilization of Resources in Colleges and Universities of Fujian Province,Fuzhou 350002,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2023年第1期198-207,共10页
Chinese Journal of Ecology
基金
国家重点研发计划战略性国际科技创新合作重点专项(2018YFE0207800)资助。
