朔州市干旱特征及其对农作物产量的影响

旨在量化表征晋北半干旱地区的干旱强度及其时空特征以及对农作物产量的影响,基于朔州市6个气象站点1972-2017年的实测气象资料,分析该地区的降水、气温的变化趋势,利用标准化降水蒸散指数(SPEI)定量分析了朔州市不同时间尺度的干旱频率及强度的时空特征.结果 表明:朔州市年均降水量变化趋势不显著,季节平均降水量规律中,...

Analysis of Drought Characteristics and Effect on Crop Yield in Shuozhou City

To quantify the spatio-temporal variation in drought intensity and its effects on crop yield in semi-arid area of northern Shanxi Province, based on the measured meteorological data (1972 to 2017) from 6 meteorological stations in Shuozhou, the variation trends of precipitation and temperature were investigated whilst the spatial and temporal characteristics of drought frequency and intensity at different time scales were analyzed using standardized precipitation evapotranspiration index (SPEI). The results indicated that the variation in annual average precipitation was insignificant. Average precipitation showed increasing trends in spring, autumn and winter, but a decreasing trend in summer. Specifically, only the average precipitation in autumn increased significantly. Meanwhile, the annual average temperature showed a significant upward trend, in which the most significant increment was discovered in spring. The drought frequency was the highest in 1992-2001, which was also the high frequency period of extreme drought. At the 10-year scale, the longest drought duration of SPEI-3 which represented the SPEI at short time scale (3 months) was 8 months between 1992 and 2001, while the longest drought duration of SPEI-12 was 7 months between 1982 and 1991. In Shuozhou City, crop yield was directly affected by drought characteristics with the relationship in the form of a quadratic function. Our results are expected to provide reference for the development of regional rain-fed agriculture.