Study on the variation characteristics of boundary temperature and growth period temperature in Ningxiang tobacco area
Based on the daily meteorological observation data of Ningxiang from 1991 to 2020,the variation character-istics of boundary temperature and growth period temperature in Ningxiang tobacco region were analyzed by trend analysis and Mann-Kendall mutation detection.The results show that:① In recent 30 years,the first day when the temperature was stable through 8 and 13 ℃ is significantly advanced,and the number of days when the daily average temperature is less than 8 and 13 ℃ was significantly reduced;The first day when the maximum temperature exceeded 35 ℃ was signifi-cantly advanced,and the number of days when 35 ℃ appears is increasing.② The average temperature in the root exten-sion stage,the long-term average temperature and the mature stage average temperature all showed an increasing trend,and the linear fitting tendency rates per 10-year reached 1.51,0.57 and 1.18 ℃ respectively.Among them,the average temperature changes in the root extension stage and the mature stage reached a significant level,and mutations occurred after 1999 and 2007 respectively.In general,the rise of temperature in the root extension period and the advance of the first day through 8 and 13 ℃ in Ningxiang tobacco area will be conducive to the early growth and rapid development of flue-cured tobacco,while the rise of temperature in the maturity period and the advance of the first day of 35 ℃ will in-crease the risk of high temperature forced ripening of flue-cured tobacco;According to the above changes,it is necessary to optimize the phenological period of flue-cured tobacco production on the basis of experiments.
flue-cured tobaccoboundary temperaturetemperature during growth periodvariation characteristics
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