内蒙古东部夏季低温冷害的遥因子及其对农业的影响

The Macro-Factor of the Low-Temperature and COld-Harm in the Summer and ItsInfluence on the Agricultural Production in the East Inner Mongolia

低温冷害是我区东部主要的农业灾害之一，本文统计分析了四十年来ＶＥＩ≥４级强大山喷发指数与我区东部夏季（６—８月）低温的关系，发现了强火山喷发与本区夏季低温有较好的遥相关系。分析结果表明，强火山爆发后当年或次年引起气温下降。平均下降幅度４．０—７．０℃，致使农业减产，减产率一般为２０—２５％。

The low-temperature and cold-harm is one of the most mainly agriculturalharm in the east Inner Mongolia,This paper analyse the relationship betwwen the highvolcanic cruption index of VEI≥4 degree and low-temperature in the summer(June toAugust).The result show that the volcanic cruption index and low-temperature has agood macrocoorelationship in the studied area,And after high volcanic explode,it wouldcause drop in temperature in this year or next year. The temperature go down about 4.0 to7.0℃and it would lead to drop in agricultural production. The reduction rate is 20 to25%.