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一、干热风在安西地区的发生规律及其危害。干热风是危害我县农业生产的严重灾害之一。特别对春小麦增产威胁很大。根据气象资料记载,从一九五九年至一九七七年,十九年中就有十年出现了中、强度干热风,次数达三十三次之多。一九七四年六月一日至八月十一日,连续出现六次,一九七七年六月十三日至七月三十一日,出现了七次,最长时间持续六天,最短两天。六月下旬至七月上旬,正是小麦灌浆,乳熟阶段,由于高温、低湿,并伴着强东风,形成大气干旱,若结合土壤墒情不足,
First, the hot and cold wind in the An-xi area of law and its harm. Dry hot air is one of the serious disasters that endanger the agricultural production in our county. In particular, a big threat to the increase of spring wheat. According to the meteorological data, a moderate to strong dry-hot wind occurred in 10 of the 19 years from 1959 to 1977, amounting to as many as 33 times. From June 1 to August 11, 1974, there were six consecutive occurrences, with seven occurrences from June 13, 1973 to July 31, 1977, the longest period lasting six days , The shortest two days. Late June to early July, it is wheat grouting, milky stage, due to high temperature, low humidity, accompanied by strong easterly, the formation of atmospheric drought, if combined with insufficient soil moisture,