陕西省冬小麦干旱时空变化特征分析  

Analysis of spatiotemporal variation characteristics of winter wheat drought in Shaanxi Province

作　　者：王连喜[1,2] 缪淼[1,2] 李琪[1,2] 薛兴权 孙晓宇[1,2] 吴东丽[3] 

机构地区：[1]江苏省农业气象重点实验室,江苏南京210044 [2]南京信息工程大学应用气象学院,江苏南京210044 [3]中国气象局气象探测中心,北京100081

出　　处：《自然灾害学报》2016年第2期35-42,共8页Journal of Natural Disasters

基　　金：国家公益性行业(气象)科研专项(重大专项)(GYHY20156001-6)~~

摘　　要：利用陕西省1981-2013年22个气象站点的逐日气象数据、冬小麦生育期及产量资料,在考虑水分敏感系数与底墒期降水的基础上,分生育期构建了陕西省冬小麦的干旱指数,并且采用统计模型分离干旱对产量的影响程度,按关键生育期划分干旱指数等级范围并分析其时空变化规律。结果表明:陕西省冬小麦整个生育期干旱频率与干旱减产率有北高南低的分布规律;陕北、关中及陕南部分地区近30a冬小麦干旱有增强趋势,而各生育期的减产率变化趋势则不尽相同。Based on daily meteorological data and the information about breeding period and yield of winter cheat from 22 stations of shaanxi Province for different growth period during 1981 -2013, the winter wheat drought index of the province was established according to growth period and in consideration of sowing water sensitive coefficient and precipitation before planting. Also, statistical model was used to separate the degree of drought impact on pro- duction. The drought index level range was divided on the basis of key growth period and its spatiotemporal change law was analyzed. The results showed that, drought frequency and drought output reduction rate of winter wheat in Shaanxi Province in whole growth period had a distribution law that higher values showed in north and lower values showed in south; there was an increasing trend of winter wheat drought in north Shaanxi, Guanzhong and part of south shaanxi in recent 30 years, and the change trend of output reduction rate in different growth period was com- pletely different.

关 键 词：陕西 冬小麦 干旱指数 时空变化 特征 

分 类 号：S16[农业科学—农业气象学]