摘要
探讨贵州省农业干旱时空演化特征,以期为农业干旱驱动机制研究提供理论参考。选取1961—2015年贵州省77个气象台站逐年降水资料,基于降水Z指数,识别贵州省农业干旱程度,结合空间插值与线性趋势方法,分析贵州省农业干旱等级及频率的时空特征。结果表明:1)近55年,贵州省农业干旱现象较为普遍,干旱面积百分比均值高达65%,干旱强度呈周期性"增强"、"减弱"交替出现的趋势; 2)重旱发生区域主要分布在贵州省东北部、中部、西南部,2011年重旱现象最为严重,重旱面积占全省总面积的26%; 3)贵州省农业干旱强度与干旱频率呈负相关,重旱频率为1. 26%~11. 39%,大旱频率为1. 55%~25. 74%,偏旱频率为1. 53%~29. 11%。
To explore the temporal and spatial evolution characteristics of agricultural drought in Guizhou province,is to provide a theoretical reference for the study of agricultural drought driving mechanism. This paper identified the agricultural drought in Guizhou province by the precipitation Z index based on the annual precipitation data of 77 meteorological stations from 1961 to 2015. Combining spatial interpolation and linear trend method were applied to analyze the spatial and temporal characteristics of agricultural drought level and frequency in Guizhou province. The results show that: 1) In recent 55 years,the phenomenon of agricultural drought is more common in Guizhou province,the average percentage of an arid area was as high as 65%,and the drought intensity showed a cyclical "enhanced"and"weakened"trend; 2) The areas with severe droughts are mainly distributed in the northeast,central and southwestern parts of Guizhou Province. In 2011,the phenomenon of severe drought was the most serious,and the area of heavy drought accounted for 26% of the total area of the province; 3) The agricultural drought intensity in Guizhou Province was negatively correlated with the drought frequency. The frequency of heavy drought was 1. 26% ~ 11. 39%,the frequency of drought was 1. 55% ~ 25. 74%,and the frequency of drought was 1. 53% ~ 29. 11%.
引文
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