安徽农业科学2017，Vol.45Issue(29)：174-179,6.
长沙地区干旱时空分布特征及其对森林火灾的影响
Spatial and Temporal Distribution of Drought and Its Impact on Forest Fire in Changsha Area
摘要
Abstract
Based on the conventional meteorological data of Changsha City from 1971 to 2016, the comprehensive meteorological drought index was calculated, and the temporal and spatial distribution characteristics of drought in Changsha area and meteorological factors were analyzed .The effects of drought on forest fires were further studied by using forest fires data from 2003 to 2015 .The results showed that the frequency of drought in Changsha area decreased in the past 46 years, and it had a obvious decadal variation of triple peak type .The annual variation of the longest consecutive dry days quite matches with the total dry days , the decadal variations of the longest annual consecutive dry days and the total annual dry days of Changsha, Ningxiang and Liuyang stations were consistent, and the consistency was found in hierarchical drought characteristics of the three stations.Drought of Changsha area occured mostly in summer and autumn,and lasted for a long time on account of atmospheric circulation. Under drought conditions,the forest vegetation water content decreased down to a certain extent, which was beneficial to forest fire.The correla-tion coefficient of the longest annual consecutive dry days and the numbers of forest fires and the affected area exceeded the reliability level of 0.05.Analysis of forest fire in 2007 showed that forest fire easily occured in a period of consecutive sunny days during a drought.关键词
干旱/时空分布特征/综合气象干旱指数/森林火灾/影响Key words
Drought/Temporal and spatial distribution characteristics/Integrated meteorological drought index/Forest fire/Effect分类
农业科技引用本文复制引用
兰明才,周莉,刘红武,周盛,丁玄,彭月,周长青..长沙地区干旱时空分布特征及其对森林火灾的影响[J].安徽农业科学,2017,45(29):174-179,6.基金项目
湖南省气象局预报预测能力建设项目"湖南省强天气指数和短期预报方法研究及应用""湖南干旱期人工增雨潜力研究" （）
湖南省气象局横向课题"湖南省分县地质灾害区划研究""湖南省精细化天气要素预报". （）
