摘要
应用"Z指数法"来判断"土壤-作物"系统法所确定的干旱事件并进行对比分析得出:两种方法的指标既相互联系又存在差异。桃源县1960~2001年27次中等和中等以上干旱事件中一致率为29 6%,基本一致率为44 5%,错误率为25 9%,"一致"的个例多出现在60年代,"基本一致"多出现在70~80年代,"错误"多出现在90年代;两者在夏季发生的旱灾中一致性较好,秋季一般,冬季较差;重灾一致性较好,中、轻灾一致性较差;用"土壤-作物"系统法指标判断干旱,重旱约每3年一遇、中旱约1 9年一遇;用Z指数方法标准判断,重旱每7年一遇、中旱约2 1年一遇。
The Zindex method was applied to judge the drought grades of 27 moderate or upward droughts determined by the 'soilplant' system method during 1960~2001 in Taoyuan County, Hunan Province Comparison results of two methods showed that the indices calculated by two methods were relative, but different from each other The ratio of consistency between both methods was 296%, basic consistency of 445% and wrong of 259% In which the droughts of 'consistency' happened in 1960s, 'basic consistency' in 1970s or 1980s, 'wrong' in 1990s The consistency of the calculated results by two methods was high for summer droughts, moderate for autumn droughts and low for winter droughts The better consistency was obtained in calculating heavy drought By comparing drought frequency using two methods, it concluded that the heavy droughts occurred every 3 years by 'soilplant' system method and every 7 years by Zindex method, while for moderate drought the frequency was 19 years by 'soilplant' system method and 21 years by Zindex method
出处
《中国农业气象》
CSCD
2003年第4期12-15,共4页
Chinese Journal of Agrometeorology
基金
中国科学院知识创新工程重要方向(KZCX2-SW-415)
国家杰出青年科学基金(49925102)
国家重点科技攻关(85-009-01-04
9-004-03-02)等项目资助
关键词
Z指数法
南方地区
季节性干旱
红壤丘岗区
Seasonal drought
drought of 'Soil-plant' system method
'Z-index' method drought
Comparison and analysis
Red soil hilly region