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冻害是茶树在生育过程中难以避免的自然灾害之一,常会给茶叶生产造成或多或少的损失。茶树冻害通常有以下两种情况:一是发生在12月至翌年1月的茶树越冬期间,由于气温降到-5～-10℃左右,甚至更低,造成茶树上部枝杆的叶片卷缩、脱落,严重的则造成光杆枯白,茶丛成“洗帚状”,此时若有西北大风的影响,往往加剧冻害。二是发生在3月～4月的茶树萌芽期间,由于北方冷空气侵扰或在明朗无风的夜间或清晨,地面和茶树表面辐射散热变冷,使近地面温度骤然降到0℃以下而发生。此时因茶芽已解除休眠,开始萌发生长,若发生晚霜危害,轻者芽尖发黑,新芽弯曲发育不良,有焦头焦边现象,
Frost damage is one of the natural disasters that can not be avoided in the process of fertility. It often causes more or less loss of tea production. Tea tree frost damage is usually the following two situations: First, occurred in December to January next year during the winter tea, the temperature dropped to about -5 ~ -10 ℃, or even lower, causing the upper branches of tea tree leaves curling, Fall off, the serious is caused by light pole withered, tea Cong into “broom-like”, at this time if the impact of northwestern winds, often aggravating frost damage. Second, during the sprouting period of tea plants from March to April, radiation from the surface of the ground and the tea tree cooled due to the cold air in the north or the night or early morning in a clear and windless manner, causing the temperature near the surface to suddenly drop below 0 ° C. . At this point because tea buds have been lifted dormancy, began to germinate and grow, if the night cream damage, light buds black, sprouting malformations, there are coke focal phenomenon,