贵州省主要粮食作物不同生长期的降水集中度时空演变

Temporal and Spatial Changes of Precipitation Concentration Degree at Different Growth Stages of Major Grain Crops in Guizhou Province

基于1961-2017年贵州省84个气象站点逐日降水数据,以贵州省主要粮食作物为例,利用降水集中度指数,分析了贵州省水稻和玉米不同生长期的降水集中度时空演变特征。结果表明:57 a间除水稻的拔节-孕穗期外,贵州省水稻和玉米的各生长期降水集中度均呈增加趋势。水稻的抽穗-成熟期和玉米的灌浆-成熟期是降水集中度增加突出时段。除水稻移栽-分蘖期和拔节-孕穗期外,贵州省大部分地区的水稻其他生长期以及玉米所有生长期的降水集中度均表现为增加特点。水稻和玉米各生长阶段的降水集中度在不同年代有所不同。水稻降水集中度变化的周期震荡频率高于玉米。

Based on the daily precipitation data of 84 meteorological stations in Guizhou province from 1961 to 2017,taking the main grain crops in Guizhou province as an example,the temporal and spatial evolution characteristics of precipitation concentration in different growing periods of rice and corn in Guizhou Province were analyzed by means of precipitation concentration index.The results showed that except the jointing-booting stage of rice,the precipitation concentration of rice and maize in each growing period increased in past 57 a.The heading-ripening period of rice and the filling-mature period of maize were the periods when precipitation concentration increased significantly.Except for transplanting-tillering stage and jointing-booting stage of rice,the precipitation concentration of rice and maize in most of Guizhou province was increased.The precipitation concentration of rice and maize at different growth stages varied in different years.The fluctuation frequency of precipitation concentration in rice is higher than that in maize.