贵州省水稻抽穗灌浆期低温冷害和高温热害时空变化

Temporal and spatial variation of cold and heat disasters at rice heading-filling stage in Guizhou Province

利用贵州省1961—2017年逐日气温观测资料,分析了气候变化背景下贵州省水稻抽穗灌浆期低温冷害和高温热害时空变化特征。结果表明:57 a间,水稻低温冷害发生频次和站次比分别呈现下降和增加趋势。发生频率空间格局基本呈现中西部较高,东部较低的特点。低温冷害变化存在2个时间尺度周期震荡,21 a是变化主周期。高温热害发生频次和站次比均呈现增加趋势。全省东部是高温热害发生频率高值区。高温热害变化存在2个时间尺度周期震荡,10 a是变化主周期。

The temporal and spatial variation characteristics of cold and heat disasters at rice heading-filling stage in Guizhou Province against the background of climate change were analyzed based on the daily temperature observation data from1961to2017in Guizhou Province.The results showed that occurrence frequency and station ratio of rice cold disasters showed a decreasing and increasing trend respectively in the past57years.The spatial pattern of occurrence frequency of cold disasters was basically higher in the central and western regions and lower in the eastern regions.There were two time scale periodic oscillations for cold disasters change,and21a was the main cycle for cold disaster change.The occurrence frequency and station ratio of rice heat disasters showed an increasing trend in the past57years.The eastern part of the province was a high-value area with high frequency of heat disasters.There were two time scale periodic oscillations for heat disasters change,and10a was the main cycle for heat disaster change.