| 摘要: |
| 【目的】分析青海省东部农业区区域干旱指标的变化特征，为区域干旱预警和抗旱减灾提供科学依据。【方法】利用青海省东部农业区12个气象站点近46年（1961-2006年）的气象资料，计算相对湿润度指数，并结合Arc GIS空间插值方法，将基于站点的相对湿润度指数网格化得出区域干旱指标，对其年际变化和季节变化进行分析，采用游程理论提取区域干旱历时和干旱强度，并对其变化进行分析。【结果】1961-2006年，青海省东部农业区近46年来平均月区域干旱指标呈线性减小趋势，干旱呈现出缓解趋势；春季和夏季区域干旱指标呈减小的线性趋势，秋季区域干旱指标呈线性增大趋势。与夏季干旱和秋季干旱相比，春季干旱历时长且干旱强度大。【结论】区域干旱指标所反映的干旱情况与青海省东部农业区实际旱情基本相符，且降雨和蒸发是青海省东部农业区季节性干旱频发的主要气候原因。 |
| 关键词: 区域干旱指标 干旱历时 干旱强度 青海省东部农业区 |
| DOI： |
| 分类号: |
| 基金项目:国家高技术研究发展计划（“863”计划）项目（14110209）；旱区节水型生态灌区关键技术研究与应用项目（2011BAD291301）；西北农林科技大学基本科研创新重点项目（Z109021202） |
|
| Regional drought index and its variation in east agricultural region of Qinghai province |
|
YAO Yao,ZHANG Xin,MA Quan,et al
|
| Abstract: |
| 【Objective】The study analyzed the variation characteristics of regional drought index in the eastern agricultural area of Qinghai province to provide scientific basis for regional drought warning and drought mitigation.【Method】The relative moisture index was calculated by using meteorological data of latest 46 years (1961-2006) at 12 meteorological stations in east agricultural region of Qinghai province.Then the regional drought index was obtained by combining the Arc GIS spatial interpolation to grid the relative moisture index,and analyzing its seasonal and inter annual changes.The changes of extract regional drought duration and intensity of drought extracted using run-length theory were also analyzed.【Result】The average monthly regional drought index in east agricultural region of Qinghai province had a decreasing trend during the recent 46 years (1961-2006) and drought was easing.Regional drought index in spring and summer decreased but increased in autumn.Comparing to summer and autumn drought,spring drought had longer duration and larger drought severity.【Conclusion】Drought conditions reflected by regional drought index were consistent with the actual drought in east agricultural region of Qinghai province.Rainfall and evaporation were the main climate reason for more frequent seasonal droughts in this area. |
| Key words: regional drought index drought duration drought severity east agricultural region of Qinghai province |
