重庆市农作物生长季干旱时空分布规律研究

Research of the Temporal and Spatial Distribution of Drought During the Crop Growing Season in Chongqing

利用重庆市11个国家气象站1960-2013年的逐日降水量资料,按照《重庆市气象灾害标准》统计1960-2013年农作物生长季的干旱次数和强度,并采用数理统计、地统计分析、小波分析等方法,研究重庆市农作物生长季干旱时空分布规律.结果表明:干旱发生次数年代际差异明显,且干旱长期变化具有阶段性和周期性;近10年来,高强度等级干旱发生频率有上升趋势;重庆市干旱主要发生在渝西南地区和中部地区以及渝东北地区.研究成果可为重庆市不同区域农作物布局和防旱避灾提供科学依据.

In order to provide a scientific basis for crop layout in different regions and protection against drought and disaster avoidance in Chongqing,a study reported in this paper was made,in which frequency and intensity of drought occurring during the crop growing season were calculated,based on the daily precipitation data from 1960 to 2013recorded at 11 national meteorological stations in Chongqing municipality and according to the Meteorological Disaster Standard in Chongqing,and mathematical statistical analysis,geostatistical analysis and wavelet analysis were used to study the temporal and spatial distribution of drought in the crop growing season in this municipality.The results revealed an obvious interdecadal variation in drought frequency and showed a periodic and cyclical feature of long-term changes of drought.In the recent 10 years,the frequency of high-intensity drought appeared to be on the rise.Drought in Chongqing occurred mainly in its southwestern,central and northeastern regions.