1前言1993年的冷夏，1994年的酷暑成为连续二年的异常夏天。两年7、8月气温的平均年偏差：东北地区17个气象台平均为－2．3℃和2．6℃，两年的差值竟达到5℃左右，这相当于南北方向移动500Km以上的温差。因此在1993年国冷夏使水稻颗粒无收、1994年因酷暑使水稻发育过旺而倒伏的 1 Foreword The summer of 1993, the summer heat of 1994, became the unusual summer of two consecutive years. Average annual temperature deviation in July and August of two years: the average of 17 meteorological stations in Northeast China was -2.3 ℃ and 2.6 ℃, and the difference between the two years reached about 5 ℃, which is equivalent to moving north and south by more than 500Km Temperature difference. Therefore, in the summer of 1993, the rice grains were shut down during the cold summer in 1994, and the rice was over-developed due to the heat in 1994