Abstract
Flue-cured tobacco in Yunnan plays an important role in formula of Chinese cigarette.Polyphenol is one of the main aroma precursors in tobacco leaf,so researchers highly focus on polyphenol compound.The objective of the study was to investigate spatial distribution of polyphenol content in flue-cured tobacco in Yunnan,and to provide references for layout of tobacco planting and using of tobacco leaf.The tobacco planting areas in Yunnan were selected as the experiment sites.1 410 flue-cured tobacco samples of C3F grade in 2007 and 2008 were collected from 705 sites via Global Position System (GPS).Polyphenol contents of tobacco samples were determined,and the original data of tobacco polyphenol contents were taken from the samples mean in every site.The original data,data of logarithmic transformation and data of Box-Cox transformation were tested for normal distribution.Surface trend and spatial distribution of tobacco polyphenol content were analyzed by Geostatistics Analyst.The results showed that the data of logarithmic transformation showed normal distribution.The integrative comparisons of semi-variogram parameters of the ordinary kriging prediction with different trends and theoretical models indicated that 0-order trend effect and gaussian model were preferable.There was moderate spatial correlation (C0/C0+C=35.71%) and no surface trend (0-order)for tobacco polyphenol content in Yunnan.In most tobacco growing areas of Yunnan,the tobacco polyphenol content ranged from 3.50% to 4.00% (acted as background value).The growing areas that the polyphenol content was over 4.00% were mainly located in the west,centre and east of Yunnan.The growing areas that polyphenol content was over 4.50% were sporadically distributed in the areas,with polyphenols contents of 4.00-4.50%.Polyphenol content showed gradient-like distribution with high-to-low trend from center to surroundings in the growing areas.The areas with polyphenol contents of 5.50-6.73% were located in Nanjian county,the northern Yongping county,the north-west of Longling county and the western Wuding county,and the area in Nanjian county was the biggest one among them.
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