The complex evaluating index for main crops’drought disasters and its multiple time scales analysis in Longdong loess plateau
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DOI：10.7606/j.issn.1000-7601.2009.02.04
Key Words: agricultural drougth index  main crop  wavelet analysis  Longdong loess plateau
Author NameAffiliation
YANG Xiaoli Lanzhou Institute of Arid Meteorology China Meteorological Administration Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster，Lanzhou，Gansu 730020，China；Pingliang Meteorological Bureau，Pingliang，Gansu 744000，China 
YANG Xingguo Lanzhou Institute of Arid Meteorology China Meteorological Administration Gansu Key Laboratory of Arid Climatic Change and Reducing Disaster，Lanzhou，Gansu 730020，China 
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Abstract:
      A complex index of evaluating agricultural drought disasters was explored considering some factors such as water shortage degree the duriation and sensitivity of crops to water shortage etc． and the index can be applied in monitoring and evaluating agricultral drought disasters．Multiple time scales charateristics of main crops’drought index was further analysed by using the wavelet analysis method which can provide some references for rational use of climatic resources and making decisions.
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