光照强度对两种土壤类型烟叶褪色的影响

Effect of light intensity on fading of tobacco leaves in two soil types

【目的】探究烟叶存放过程中光照强度对不同土壤类型烤烟褪色程度的影响。【方法】以"粤烟97"烤后烟叶C3F为试验材料,研究了3种光照强度对2种土壤类型产出的烤后烟叶色素含量、色度和色差值的影响,并对烟叶褪色程度进行划分。【结果】在不同光照条件下,烤烟的各色素含量、色差值和色度值均有所下降,随着光照强度的提高,烤烟的各指标下降越明显。而在同一光照强度处理下,沙泥田烤烟各指标下降量大于紫色土田烤烟,其烟叶在强光处理30d时,类胡萝卜素下降91.14μg/g,色差b值下降13.9,色度Y值下降15.1。通过聚类分析的结果建立了MLP神经网络模型,将烟叶褪色程度分为轻度、中度和重度。【结论】光照强度会导致烤烟色素分解,且光照强度越大,褪色越严重;紫色土田烤烟较沙泥田烤烟不易褪色。

【Objective】This study explored the effect of light intensity on the discoloration of flue-cured tobacco leaves with different soil types during tobacco storage.【Method】The C3F tobacco leaves of Yueyan 97 was used to investigated the effects of three light intensities on the pigment content,chroma and color difference of tobacco leaves from two kinds of soils and the fading degree of tobacco leaves was studied.【Result】Under different light conditions,the contents of various pigments,color difference and chroma of flue-cured tobacco decreased.With the increase of light intensity,the decreases of flue-cured tobacco indexes increased.Under same light intensity,the decreases of flue-cured tobacco indexes from sandy muddy field were larger than that of purple soil.The carotenoid from sandy muddy field decreased by 91.14μg/g,the color b value dropped by 13.9,and the chromaticity Y decreased by 15.1.The clustering analysis established MLP neural network model,and divided the fading degree of tobacco leaves into mild,moderate and severe.【Conclusion】Light could cause the decomposition of flue-cured tobacco pigment,and the fading increased with the increase of light intensity.The fading of flue-cured tobacco in purple soil was less than that in sand soil.