On Total Salt Amount and Salt Accumulation in Surface Soil in Tobacco Fields in Hunan
湖南植烟土壤盐分及其表聚特征研究

Surface soils of tobacco fields in Hunan Province were collected to analyze total salt concentrations and composition of ions. The results showed that a remarkable salt accumulation occured in surface soils after tobacco leaves were harvested. Total salt concentration reached up to 4.17 g/kg, near the intensely salinized soil. Higher salt accumulation in surface soil occured in tobacco-rice rotation than in tobacco dryland. Moreover, the highest total salt amount of surface soil in tobacco-rice rotation fields happened in Hengyang, and followed by Yongzhou and Chenzhou. In addition, NO3-, SO42-, Ca2+ and K+ consisted of main ions in surface soils in the tobacco-rice rotation fields, which accounted for 95.21% of total salt amount.