近50年宁夏酿酒葡萄晚霜冻日数及变化趋势分析

利用1961—2010年宁夏16个气象站的逐日最低气温资料,根据酿酒葡萄霜冻气候指标统计了终霜日、霜冻日数等。采用统计和气候诊断分析方法,研究了宁夏酿酒葡萄的晚霜冻日数和变化趋势。结果表明:近50 a全区酿酒葡萄晚霜冻平均日数为1.8 d/a;近50 a全区酿酒葡萄霜冻日数呈现减少趋势,引黄灌区霜冻日数的线性倾向率与全区接近;全区轻、中、重霜冻日数与50年平均相比,在20世纪70年代偏多,60和80年代基本持平,90年代及以后偏少;气候突变检验结果表明霜冻日数的突变年为1984年。

Wine Grapes Last Frost Days and Its Change Trend during Past 50 Years in Ningxia

Based on the daily minimum temperature data at 16 meteorological stations across Ningxia during the years from 1961 to 2010 and according to the wine grape frost climate index,the dates and days of the last frosts were counted using statistical and diagnostic analysis method. The wine grapes last frost days and their change trends were studied. The results showed that during the past 50 years, the average days of the last frost of the wine grape across Ningxia was 1.8d/a. and the days of wine grape frost across Ningxia showed a decreasing trend and the linear tendency rate of the frost days in Yellow River Irrigation Area was close to the average level of the whole Ningxia. Comparing with the average of the past 50 years, the days of the light,medium and heavy frost during 1970＆#39;s were more,those during the 1960＆#39;s and 1980s＆#39; were ba-sically at the same level and that during the 1990＆#39;s and later were less. The climate change test results showed that the mutation year of the frost days was the year 1984.