干旱地区农业研究
榦旱地區農業研究
간한지구농업연구
AGRICULTURAL RESEARCH IN THE ARID AREAS
2015年
3期
260-266
,共7页
综合气象干旱指数(CI)%改进的综合气象干旱指数(CInew )%干旱频率%干旱强度%降水强度%土壤相对湿度%陕西省
綜閤氣象榦旱指數(CI)%改進的綜閤氣象榦旱指數(CInew )%榦旱頻率%榦旱彊度%降水彊度%土壤相對濕度%陝西省
종합기상간한지수(CI)%개진적종합기상간한지수(CInew )%간한빈솔%간한강도%강수강도%토양상대습도%합서성
comprehensive meteorological drought index ( CI )%improved comprehensive meteorological drought in-dex ( CInew )%drought frequency%drought intensity%precipitation intensity%soil relative moisture%Shaanxi Province
利用陕西4个站点2002—2012年逐日降水、气温资料和气象干旱指数，结合测墒站建站至2012年墒情数据，通过增加变量和调整权重系数对 CI进行改进，统计分析改进前后的综合气象干旱指数在陕西干旱过程描述、频率及强度等方面的应用情况和改进效果，并比较了与同期土壤相对湿度的相关性差异。结果表明：改进的综合气象干旱指数（ CInew ）监测的干旱日数较CI偏少，春夏季尤为明显。各等级干旱发生频率CInew较CI偏低0．1％～8％，年干旱强度较 CI平均偏低64．2，但改进前后的综合气象干旱指数在年干旱日数、频率、强度的总体变化特征方面并没有显著差异，均能反映出陕西干旱频率及强度的变化特征。CInew 在具体干旱过程监测中的不合理跳跃次数明显减少，克服了 CI对弱降水的骤然反应，保留了对强降水的敏感性，CInew与土壤相对湿度的相关性达0．9，较CI明显偏好，监测过程更符合实际干旱的演变规律，程度更贴近实际。因此，CInew可以作为陕西干旱监测与评估指标之一在业务中推广应用。
利用陝西4箇站點2002—2012年逐日降水、氣溫資料和氣象榦旱指數，結閤測墑站建站至2012年墑情數據，通過增加變量和調整權重繫數對 CI進行改進，統計分析改進前後的綜閤氣象榦旱指數在陝西榦旱過程描述、頻率及彊度等方麵的應用情況和改進效果，併比較瞭與同期土壤相對濕度的相關性差異。結果錶明：改進的綜閤氣象榦旱指數（ CInew ）鑑測的榦旱日數較CI偏少，春夏季尤為明顯。各等級榦旱髮生頻率CInew較CI偏低0．1％～8％，年榦旱彊度較 CI平均偏低64．2，但改進前後的綜閤氣象榦旱指數在年榦旱日數、頻率、彊度的總體變化特徵方麵併沒有顯著差異，均能反映齣陝西榦旱頻率及彊度的變化特徵。CInew 在具體榦旱過程鑑測中的不閤理跳躍次數明顯減少，剋服瞭 CI對弱降水的驟然反應，保留瞭對彊降水的敏感性，CInew與土壤相對濕度的相關性達0．9，較CI明顯偏好，鑑測過程更符閤實際榦旱的縯變規律，程度更貼近實際。因此，CInew可以作為陝西榦旱鑑測與評估指標之一在業務中推廣應用。
이용협서4개참점2002—2012년축일강수、기온자료화기상간한지수，결합측상참건참지2012년상정수거，통과증가변량화조정권중계수대 CI진행개진，통계분석개진전후적종합기상간한지수재협서간한과정묘술、빈솔급강도등방면적응용정황화개진효과，병비교료여동기토양상대습도적상관성차이。결과표명：개진적종합기상간한지수（ CInew ）감측적간한일수교CI편소，춘하계우위명현。각등급간한발생빈솔CInew교CI편저0．1％～8％，년간한강도교 CI평균편저64．2，단개진전후적종합기상간한지수재년간한일수、빈솔、강도적총체변화특정방면병몰유현저차이，균능반영출협서간한빈솔급강도적변화특정。CInew 재구체간한과정감측중적불합리도약차수명현감소，극복료 CI대약강수적취연반응，보류료대강강수적민감성，CInew여토양상대습도적상관성체0．9，교CI명현편호，감측과정경부합실제간한적연변규률，정도경첩근실제。인차，CInew가이작위협서간한감측여평고지표지일재업무중추엄응용。
The improved comprehensive meteorological drought index ( CInew ) was proposed in view of shortages of comprehensive meteorological drought index ( CI ) by adding new variables and changing the weight coefficients of vari-ables based on the daily precipitation ,daily temperature ,meteorological drought index at 4 stations from 2002 to 2012 , and soil moisture data from the start of record to 2012 .Compared with CI index ,applicability characteristics and effects of CInew were analyzed through the descriptions of the drought course ,frequency ,and intensity .The correlation between the soil moisture data and monitor data from CI and CInew was also analyzed .The results showed that the number of drought days monitored by CInew was fewer than that by CI ,especially during spring and summer .Frequency of drought at different levels monitored by CInew was lower by 0 .1% ~8% than that of CI .Annual average drought intensity by CInew was 64 .2 lower than that by CI . However , no statistical significant differences between CI and CInew during drought days were observed on distribution of drought frequency and drought intensity change ,both of which could reflect the characteristics of drought frequency and drought intensity variation .The unreasonable jumping times were found to be decreased significantly by CInew monitoring ,which coped with CI on the drought abrupt change to weak precipitation and retained sensitivity to heavy rainfall .Correlation coefficient between CInew and soil moisture was 0 .9 ,better than that be-tween CI and soil moisture .Compared with CI index , CInew could objectively reflect the drought degree and the process to evaluate .Hence , CInew could be used as an index for drought monitoring and evaluation in Shaanxi Province .
