湖南植烟土壤有效硫及烟叶硫研究初报

Preliminary Study on Available Sulfur in Tobacco-planting Soils and Sulfur Content in Flue-cured Tobacco Leaves in Hunan Province

通过对湖南不同植烟生态区土壤进行野外采样和相应区域烤后烟叶的收集，对湖南植烟土壤有效硫及烟叶硫含量状况进行了系统的研究。结果表明，湖南植烟生态区土壤有效硫和烟叶硫含量分别为34．74mg／kg和0．849％。有效硫含量较高的土壤占80％，仅有20％左右在适宜范围内。烟叶硫含量仅有30％在0．20％～0．70％正常范围内，70％烟叶硫含量超标，尤其是浏阳和宁乡植烟区的烟叶硫含量超过了1．00％。湖南植烟土壤有效硫和烟叶硫含量的变化幅度及变异系数都较大，土壤有效硫的极差为70．38mg／kg，变异系数为41．85％；烟叶硫含量的极差为1．412％，变异系数为34．28％。由此可见，湖南植烟生态区土壤有效硫和烟叶硫含量普遍偏高，且植烟生态区之间差异较大。

Soil available sulfur and flue-cured tobacco leaf sulfur contents were determined in soil and leaf samples from tobacco-planting areas in Hunan. The results indicated that the average contents of available sulfur in tobacco-planting soil were 34.74 mg/kg, only 20% of soil samples were in optimum soil sulfate range. About 80% of total tobacco planting areas was on the high sulfate range. The average flue-cured tobacco leaf sulfur contents were 0.849 %, only 30% of leaf samples were in optimum sulfate range, about 70% of flue-cured tobacco leaves sulfitr content were over 0.70%, especially in Liuyang and Ningxiang county where flue-curd tobacco leaf sulfur contents were above 1.00 %. The range and coefficient of variability of soil available sulfur contents in tobacco-planting soil were huge. The range and coefficient of variability of soil available sulfur contents in tobacco-planting soil were 70.38 mg/kg and 41.85% respectively. At the same time, The range and coefficient of variability of flue-cured tobacco leaves sulfur contents were huge too. The range and the coefficient of variability of flue-cured tobacco leaves sulfur contents were 1.412% and 34.28%, respectively. The results suggested the contents of available sulfur in tobacco-planting soil and sulfur in flue-cured tobacco leaves were high with huge variation in Hunan.