湖南烟区气候因素分析及对烟叶化学成分的影响

分析了湖南烟区气候因素特点及热量与降雨条件对烟叶化学成分的影响，结果表明：湖南烟叶生长季节大田期具有平均温度适宜、日均温≥20℃持续天数较长、≥10℃活动积温大于2600℃·d和昼夜温差较小等特点，但大田期降雨量和空气相对湿度较高，日照百分率较低。在一定范围内，减小旺长期降雨量和昼夜温差，提高伸根期、旺长期平均气温和≥10℃活动积温，有利于优质烟叶品质的形成。利用聚类分析方法将湖南主要产烟县市分为3类，第1类主要包括湘南、湘中和湘东烟区，第2类主要包括湘西烟区，第3类主要包括湘西北烟区，并对各类烟区气候因子和烟叶品质特点进行了描述。

Analysis of Climate Factors and Theirs Influence on Chemical Components of Flue-cured Tobacco Leaves at Tobacco growing Areas of Hunan Province

Climate factors at tobacco-growing areas in Hunan Province and the influence of heat and precipitation on chemical components of fluecured tobacco leaves were analyzed. The results indicated that Hunan tobacco growing areas had suitable temperature, a long periods of time with daily average temperature of ≥ 20℃, more than 2600℃ for accumulated temperature of ≥ 10℃ and small temperature difference between day and night. But precipitation and air humidity were high and sunlight percentage was low during growing periods. With total precipitation during vigorous growing stage and day-and-night temperature difference decreasing, and with average temperature during root extending and vigorous growing stages and accumulated temperature of ≥ 10℃ increasing, it could be helpful for the development of high quality flue-cured tobacco leaves. Hunan tobacco-growing areas could be classified into three groups by cluster analysis method. The first group mainly included areas of South, Middle and East Hunan; The second group mainly included areas of West Hunan ; The third group mainly included areas of Northwest Hunan. The climate factors and the tobacco quality traits for different groups were briefly described.