Regional Crop Growth Stages Drought Frequency Analysis Based on Copula Function
The precipitation at crop growth stage and its space-time distribution are the main factors of agricultural drought. So analysis of precipitation probability distribution characteristics at crop growth stage and study area plays an important role in guiding the agricultural drought control. In this study, taking the corn planting in Puyang Qucun Irrigation Area as an example, the probability distribution characteristics of precipitation at different growth stages of maize were analyzed and calculated. Firstly,according to the maize growth stage, the distribution function of precipitation at each stage was fitted; then the combined distribution function of rainfall in the adjacent growing stages was constructed by using the function Archimedean Copula, which described the characteristics of drought distribution during the growth stages of corn in this area. This paper fully considers the precipitation statistical rule in the adjacent growing stages,so it is possible to provide more comprehensive and accurate drought information.
crop growth stages droughtCopula functionfrequency analysisreturn period
NETL
NSTL
万方数据
维普
