修订茶树霜冻害气象指标对于科学客观地开展春季茶树霜冻灾害的监测预警和影响评估具有重要意义。本文以浙江省茶树4个主栽品种为材料,应用人工气候箱开展低温胁迫控制试验,模拟6组不同低温条件和持续时间(15℃/3℃、12℃/2℃、10℃/1℃、10℃/0℃、10℃/-1℃、10℃/-2℃,各设置组较高温度持续12 h,较低温度持续4 h;对照温度25℃),观测茶树叶片生理生化指标的变化,应用Logistic函数确定茶树的半致死温度。结果表明:茶树霜冻害的发生与低温强度和持续时间密切相关,各品种茶树叶片半致死温度为福鼎大白茶(-1.5℃)<乌牛早(-1.3℃)<鸠坑(-1.2℃)<龙井43(-0.7℃);结合历史灾情和茶园逐小时气温观测数据,提出了新的茶树春霜冻害等级标准,包括气象指标、茶树受灾症状和新梢芽叶受害率,其中气象指标为新梢生长期间每日的小时最低气温和持续小时数。应用2013年春季2次霜冻灾害验证,新标准的监测结果与实际情况基本吻合,并且比原有标准吻合率提高41.7%。研究成果可为茶叶气象定量化服务提供重要的技术支持。 Amending the meteorological indicators of tea tree frost is of great significance for the scientific and objective monitoring, early warning and impact assessment of tea tree frost disaster in spring. In this paper, four main cultivars of tea tree in Zhejiang Province were used as materials. The artificial climate chamber was used to carry out the low temperature stress control experiment. The effects of different low temperature conditions and duration (15 ℃ / 3 ℃, 12 ℃ / 2 ℃, 10 ℃ / 1 ℃ , 10 ℃ / 0 ℃, 10 ℃ / -1 ℃, 10 ℃ / -2 ℃, each set of high temperature for 12 h, the lower temperature for 4 h; control temperature 25 ℃) to observe the physiological and biochemical indexes The Logistic function was used to determine the lethal temperature of tea plant. The results showed that the incidence of frost damage in tea was closely related to the intensity and duration of low temperature, and the lethal lethal temperature of tea leaves of Fuding was 1.50 ℃ (-1.3 ℃) )