Spatial Distribution of Rice Drought Frequency during Different Growth Periods in Sichuan Basin

doi:10.3969/j.issn.1000-6362.2016.02.014

Abstract

Abstract: Drought significantly influences rice growth and development and has caused great loss of rice production in the Sichuan basin. The basin was divided into five rice growing regions based on its landforms and cropping systems in this paper. Authors analyzed the spatial distribution characteristics of drought frequency for each growth period of rice in the basin in terms of drought assessment index, using historic daily weather data from 102 meteorological monitoring stations between 1980 and 2014 and the phonological data from 32 agro-meteorological observation stations. The results showed that drought frequency was over 90% during the transplanting and tillering stages in parts of the middle and southern basin. During the periods from tillering to jointing stage and from jointing to booting stage, the drought frequency varied between 50% and 90% over the majority area of the basin. The frequency occurred during the periods from booting to heading stage and from heading to mature stage was lower compared with that during the other stages. It was about 50% during the period from booting and heading stage over most of the basin, apart from parts of the western, central basin and northeastern basin where the frequency was around 70%-84%. And the frequency was about 50%-70% during the period from heading to mature over most of the basin.

Key words: Sichuan basin, Rice, Drought assessment index

LIU Yan-yan, ZHANG Yu-fang, WANG Ming-tian, CHEN Chao, PAN Xue-biao, ZHOU Xue-hui. Spatial Distribution of Rice Drought Frequency during Different Growth Periods in Sichuan Basin[J]. Chinese Journal of Agrometeorology, 2016, 37(02): 238-244.

References

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