湖南烟区烤烟硫含量与土壤有效硫含量的分布特点

Distribution characters of sulfur in flue-cured tobacco leaf and available sulfur in soil in Hunan tobacco-growing areas

采用野外调查、田间试验与室内分析相结合的方法,分析了湖南烟区烤烟硫含量与土壤有效硫含量的分布特点及相互关系.结果表明:湖南烟叶硫含量较高,平均为(0.81±0.26)%,变幅为0.34%～1.49%,有39.29%的烟叶硫含量小于0.70%;不同等级烟叶硫含量的变化规律为上橘二(B2F)>中橘三(C3F)>下橘二(X2F).湖南种植烤烟土壤有效硫含量较丰富且变异范围大,平均为(37.16±27.59)mg.kg-1,变幅为2.20～217.60mg.kg-1;有22.58%的土壤在不同程度上缺硫(≤16.0mg.kg-1),有26.08%的土壤有效硫含量偏高(>50.0mg.kg-1),满足优质烟叶生长发育的正常土壤占51.34%;不同土壤类型有效硫含量的变化规律为鸭屎泥>黄泥田>红黄泥>青泥田>沙泥田>黄灰土>黄壤土.相关分析表明,烟叶硫含量与土壤有效硫含量呈极显著正相关(r=0.469,P<0.01).

Through field survey and laboratory analysis, this paper studied the distribution characters and interrelationships of sulfur in flue-cured tobacco leaf and available sulfur in soil in Hunan tobacco-growing areas of China. The results indicated that in Hunan tobacco-growing areas, the sulfur content in flue-cured tobacco leaf was relatively high as compared with other tobacco-growing areas in China, which ranged from O. 34% to 1.49% with the mean of （0. 81 ± 0.26）%. 39. 29% of the leaf samples had a sulfur content of 〈 0.70%, and the sulfur content in different grades of flue-cured tobacco leaves was B2F 〉 CsF 〉 X2F. The available sulfur content in soil was rich, which ranged from 2. 20 to 217.60 mg·kg^-1, with the mean of （37. 16 ± 27.59） mg·kg^-1. Among the soil samples collected, 22.58% of them were considered as lack of sulfur （ ≤16. 0 mg·kg^-1 ）, 26. 08% had an available sulfur content exceeding 50. 0 mg·kg^-1 , and 51.34% could satisfy the sulfur demand of high quality tobacco. The available sulfur content in different types of soil was in the order of duck feces mud 〉 yellow mud field 〉 red yellow mud 〉 blue mud field 〉 sand mud field 〉 yellow ash soil 〉 yellow soil. There was a very significant positive correlation between the contents of sulfur in flue-cured tobacco leaf and available sulfur in soil （r =0. 469, P 〈 0. 01 ）.