湖南烟区土壤水溶性氯的地区分布特点及其与烤烟氯含量的关系

Geographic distribution of soil water-soluble chlorine content and its relations to chlorine content in flue-cured tobacco leaves in Hunan tobacco-growing areas

分析了湖南烟区1341个土壤样品的水溶性氯含量与209个烤烟样品氯含量的空间分布特点。结果表明:湖南烟区土壤水溶性氯含量变幅为1.20～72.10mg·kg-1,平均为(13.55±7.75)mg·kg-1,有40.6%的土样氯含量较低,尤以湘西地区土壤水溶性氯含量最低,为(8.88±8.04)mg·kg-1;湖南烟区烤烟氯含量变幅为0.15%～0.49%,平均为0.31%±0.09%,不同等级烤烟氯含量呈现出X2F>C3F>B2F的趋势,但等级之间差异不显著;根据土壤水溶性氯含量把样品分组后,对应的烤烟样品氯含量在组间差异达到了显著水平;烤烟氯含量与土壤水溶性氯含量之间存在极显著的线性关系(R2=0.8106,P<0.01)。

A total of 1341 soil samples and 209 flue-cured tobacco leaf samples were collected from Hunan tobacco-growing areas, and their chlorine contents were determined. The soil water- soluble chlorine content in these areas ranged from 1.20 to 72. 10 mg·kg^-1 , and averaged （ 13.55 ± 7.75 ） mg·kg^-1. 40. 60% of the soil samples had a lower water-soluble chlorine content, with the lowest （8.88 e8.04） mg·kg^-1 in western Hunan. The chlorine content of fluecured tobacco leaves was from 0. 15% to 0. 49% , and averaged 0. 31% ±0. 09%. The chlorine content of different grades flue-cured tobacco leaves had a trend of X2F 〉 C3F 〉 B2F, but the difference was not significant. After soil samples were grouped according to their water-soluble chlorine content, a significant difference was found in the chorine content of corresponding fluecured tobacco leaves. There was a significant linear relationship between the chlorine content of flue-cured tobacco leaves and the water-soluble chlorine content of soil （ R^2 = 0. 8106, P 〈 0.01）.