白银市霜冻气候变化及对农业生产的影响

利用1971～2005年甘肃省白银市辖区4个台站逐日地面最低温度资料,统计分析了早、晚霜冻发生的气候特征和时间变化规律.结果表明,白银市晚霜冻平均结束日期在5月上旬,南晚北早,山区晚于川区,年际变化南北小中部大.早霜冻平均开始日期在10月上旬,南早北晚,山区早于川区,年际变化从北向南增大.晚霜冻结束日期具有13 a和5 a左右的周期,受气候变暖影响近35 a来晚霜冻提前了17 d左右,早霜冻变化不大.并分析了霜冻对农业生产的影响,提出了防御对策.

The Climatic Change and Frost Influence on Agriculture in Baiyin Area

By using the surface minimum temperature of 4 observational stations in the period 1971-2005 in Baiyin area, the spatial features and frost evolution were analyzed. The results show that late frost ends at first ten days of May, and that it is later in the south than in thc north, and also later in the mountains than in the lower reaches. Early frost begins at first ten days of October and it is later in the north than in the south, but it is earlier in the mountains than in the lower reachcs. The late frost ending datc has a phase of about 13 years and 5 years. Affected by climate warming the date is advanced by 17 days, but the data of early frost is not advanced. The influence of frost on agriculture is discussed and defensive srategies are suggested.