丽水低温霜冻的气候变化特征及其对春茶始采日的影响

发布时间：2018-03-30 18:38

  本文选题：应用气象学　切入点：低温霜冻　出处：《河南农业科学》2017年02期

【摘要】：利用1954—2015年丽水冬季、春季逐日气温观测资料以及2001—2015年丽水市农业局茶叶站资料,根据茶叶低温冻害的气象灾害指标,统计丽水茶叶低温冻害的发生发展情况,并采用多尺度趋势等方法分别从年、月尺度分析低温冻害的气候变化特征,利用相关分析等统计方法研究丽水低温冻害对春茶始采日的影响。结果表明:近62 a来,1月发生冬季冻害的频次最高;2月发生早春霜冻的概率最高,2月茶叶发生轻度、中度和重度早春霜冻的年平均日数分别达到4.8 d、3.9 d和3.9 d。早春霜冻日数呈显著递减趋势,气候倾向率为每10 a减少1.3 d;极端最低气温呈增加趋势,约每10 a升高0.3℃。3种早春霜冻等级,以轻度霜冻为主,占霜冻总日数的53.8%,中度霜冻和重度霜冻日数分别只占霜冻总日数的27.4%和18.8%。低温霜冻对春茶采摘的影响,主要以早春霜冻为主,且以轻度霜冻对始采日的影响最显著,霜冻日数与春茶始采日呈正相关,极端最低气温与始采日呈负相关,即霜冻日数越多,气温越低,春茶达到萌芽的时间越长,始采日也相应推迟。
[Abstract]:Based on the observation data of daily air temperature from 1954 to 2015 in Lishui winter and spring, and the data of tea station of Lishui City Agriculture Bureau from 2001 to 2015, the occurrence and development of low temperature freezing injury of Lishui tea were counted according to the meteorological disaster index of low temperature freeze injury of tea. The characteristics of climate change caused by low temperature and freezing injury were analyzed from year scale and month scale by means of multi-scale trend. The effect of low temperature freezing injury in Lishui on the beginning of spring tea harvest was studied by means of correlation analysis. The results showed that in recent 62 years, the frequency of winter frost injury in January was the highest, the probability of early spring frost in February was the highest, and that of tea in February was mild. The average annual days of moderate and severe early spring frost were 4.8 d / 3.9 d and 3.9 d respectively. The number of early spring frost days decreased significantly, the climatic tendency rate decreased 1.3 days per 10 years, and the extreme minimum temperature increased. The grade of early spring frost increased by 0.3 鈩，

本文编号：1687135