干热风是小麦灌浆到成熟期间由于气温高、燥、并伴有一定风力而形成的一种灾害性天气.它将直接影响小麦的产量。一、为害机理及气象指标小麦于开花、灌浆至乳熟期要求最适宜的温度是2℃—22℃正常成熟的小麦呈现黄叶、绿鞘、金黄穗,粒多粒饱产量高。若在这个时期遇到干热风,就会使小麦植株蒸腾强度骤然加大,因根系活力所不及而造成水分平衡失调,各种酶类系统的正常活动受到干扰,从而引起小麦正常生理过程的破坏。最显著的表现是呼吸强度明显提高,叶绿素分解增 Dry and hot wind is a kind of disastrous weather that wheat is formed from grain filling to ripening due to high temperature, dryness and certain wind, which will directly affect the yield of wheat. First, the damage mechanism and meteorological indicators Wheat flowering, filling to milky maturity requirements of the most suitable temperature is 2 ℃ -22 ℃ normal mature wheat presents yellow leaves, green sheath, golden ear, grain and more grain full high yield. If encountered in this period of dry and hot wind, it will suddenly increase the transpiration of wheat plants due to lack of vitality of the root cause of water balance disorders, the normal activities of various enzyme systems are disturbed, causing the normal physiological processes of wheat damage . The most significant performance is significantly increased respiratory intensity, increased chlorophyll decomposition