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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 the daily meteorological data of 22 meteorological stations from 1981 to 2013 in Shaanxi Province and the growth period and yield data of winter wheat, the drought index of winter wheat in Shaanxi Province was constructed based on the moisture sensitivity coefficient and precipitation at the end of soil moisture, The statistical model separated the degree of drought impact on the yield, according to the key growth stages of drought index level range and analysis of its temporal and spatial variation. The results showed that the drought frequency and drought reduction rate of winter wheat in North Shaanxi Province had the distribution pattern of north high south and low rainfall. The drought in the northern part of Shaanxi, Guanzhong and parts of southern Shaanxi tended to increase in the past 30 days, while the decreasing rate in each growth period Is not the same.