Spatiotemporal Change in Drought and Waterlogging during Maize Growth Season in Jilin Province

Abstract

【Objective】 Drought and waterlogging are two abiotic stresses impacting crop growth in many regions across the world. Understanding their variation is a prerequisite to their management and safeguarding agricultural production. Taking Jilin province in northeast China as an example, this paper analyzes spatiotemporal change of drought and waterlogging during maize growth season over the past 60 years. 【Method】 Daily meteorological data measured from 1961 to 2020 at 27 weather stations across the province were used to calculated the modified crop water deficit index (mCWDI). The daily crop coefficient (Kc) was estimated using the piecewise function. The characteristics of the drought and waterlogging were calculated using the climatic variation trend method and the center of gravity transfer method. 【Result】 Spatially, the frequency of drought shows a decreasing trend from the northwest to the southeast. Temporally, the frequency of drought decreases from the early stage to the development stage, with the drought occurring more frequently in the middle and late stages of the maize. The waterlogging occurred more frequently in the southeast and in the early and late growth stage, and less frequently in the development stage of the maize. We also found that the occurrence of waterlogging in the central province increased faster than in other regions. 【Conclusion】 Drought and waterlogging in Jilin province vary temporally and spatially. The results presented in this paper provide guidelines for improving their management and safeguarding maize production in this region.

Keywords

• modified crop water deficit index
• drought and waterlogging
• maize
• jilin province