摘要
旱灾一直影响中国农业可持续发展,抗旱减灾是我国粮食安全的重要保证。近几十年来,中国南方旱灾风险性有增强趋势,探究中国南方旱灾形成机理对农业防旱减灾具有重要的理论意义。以2013年衡阳市旱灾为案例,从致灾因子、孕灾环境与应急管理等方面综合分析了旱灾风险性形成机理。利用CI指数法,对2013年衡阳市干旱过程进行了诊断,并计算了7个县域干旱危险度。结果表明,衡阳县干旱日数最大,达150d,常宁市干旱日数最小,为98d。干旱危险度最高是衡南县,衡阳县次之。这种干旱危险性的区域差异,使得衡南县、衡阳县、祁东县成为旱灾高风险区,而常宁市、耒阳市为旱灾低风险区。水利设施不足,抗旱措施不得力,强化了旱灾风险性及其区域差异。
Drought is a limiting factor of agricultural sustainable development in China. Against the drought and disaster mitigation is an important guarantee of food security in our country. In recent decades, the drought risk in southern China is inclined to strength, so study about formation mechanism of the drought in southern China has important theoretical significance to control drought. With the examples of drought in Hengyang in 2013, the forming mechanism of drought risk was analyzed comprehensively from disaste-deducing factors environment of developing drought hazards and emergency management. The drought process diagnosis and drought hazard were studied by CI in Hengyang in 2013. The results show that the maximum number of drought days in Hengyang County, up to 150 days, the minimum number of drought days in Changning City, up to 98 days. The drought risk degree was the highest in Hengnan County and the drought risk degree in Hengyang County came the second. Research showed that Hengnan County, Hengyang County, Qidong County were the high risk area and Changning City, l.eiyang City were low risk region. Lack of water conservancy facilities and negative measure of against the drought underscored the drought risk and its regional differences.
出处
《衡阳师范学院学报》
2014年第3期49-53,共5页
Journal of Hengyang Normal University
基金
国家自然科学基金资助项目(41171075
71273081)
湖南省科技厅计划资助项目(2012FJ3019)
湖南省高校科技创新团队支持计划资助项目
湖南省重点学科人文地理支持项目
关键词
南方干旱
旱灾风险
旱灾形成机理
drought in southern China
drought risk
formation mechanism of drought risk
