中国农业气象

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滤减UV-B辐射强度对植烟环境小气候要素的影响

田先娇;陈宗瑜;张德国;董陈文华;纪鹏;   

  1. 云南农业大学农学与生物技术学院;西南林业大学资源与环境学院;
  • 出版日期:2011-04-10 发布日期:2011-04-10
  • 基金资助:
    国家烟草专卖局“烟叶品牌导向原料体系研究”(110200801034)子课题“低纬高原生态环境对烤烟品牌原料影响的机理研究”

Impacts of Attenuated UV-B Radiation on Microclimate Factors of Cultivating Flue-cured Tobacco

TIAN Xian-jiao1,CHEN Zong-yu1,ZHANG De-guo2,DONG Chen-wen-hua1,JI Peng1(1.College of Agronomy and Biotechnology,Yunnan Agricultural University,Kunming 650201,China;2.College of Resource andEnvironment,Southwest Forestry University,Kunming 650224)   

  • Online:2011-04-10 Published:2011-04-10

摘要: 以烤烟(Nicotiana tabacum L.)品种‘K326’为试验材料,采用盆栽方法,以覆盖3种不同厚度透明薄膜滤减UV-B辐射的处理方式进行试验。在成熟初期,于试验设定时间点分别测定50cm和150cm高度处烤烟环境小气候要素,应用多元统计岭回归分析方法分析了滤减自然条件下25%(T1)、50%(T2)和65%(T3)的UV-B辐射强度对各要素的影响。结果表明:叶片周围空气温度(Ta)、光合有效辐射(PAR)和饱和水汽压亏缺(VPD)的日变化曲线总体呈上升趋势,而二氧化碳浓度(Ca)、相对湿度(RH)则呈下降趋势。岭回归分析表明,滤减UV-B辐射对植烟环境小气候要素作用显著,具体表现在T1、T2、T3处理对Ca和RH总体上均具有抑制作用,滤减50%的UV-B辐射对叶片周围Ca的抑制作用最大;滤减UV-B辐射对Ta有明显的促进作用,滤减50%的UV-B辐射对Ta促进作用最强;相对于自然条件而言,滤减65%的UV-B辐射更有利于烟叶对辐射能的吸收和利用;T1处理对VPD具有明显的促进作用,T2处理在不同高度上对VPD作用方向不一致,T3处理的抑制效应则表现不明显,即在不同处理的UV-B辐射强度水平下,植烟环境小气候要素对UV-B辐射的响应存在一定的差异。

关键词: 烤烟, 滤减UV-B辐射, 小气候要素, 岭回归分析

Abstract: Potted experiment for flue-cured tobacco(Nicotiana tabacum L.)K326 was conducted with 3 different attenuated UV-B radiation treatments.The impacts of different treatments on microclimate factors were analyzed at early maturity stage of flue-tobacco by using ridge regression analysis.The results showed that the diurnal curve of air temperature(Ta),photosynthetic active radiation(PAR) and vapor pressure deficit(VPD) around tobacco leaf increased,and the diurnal curve of Carbon-dioxide concentration(Ca) and air relative humidity(RH) decreased.All treatments inhibited Ca and RH,but promoted Ta,especially in treatment 2.Treatment 3 was helpful for tobacco leaf absorbing and utilizing radiation.To sum,the impacts of UV-B radiation on microclimate factors were different with different attenuated UV-B radiation treatments.

Key words: Flue-cured tobacco, Flue-cured tobacco, Attenuated UV-B radiation, Microclimate factors, Ridge regression analysis