湖南植烟土壤盐分及其表聚特征研究

对湖南主要植烟区表层土壤总盐及主要盐分离子的组成进行了分析.结果表明:烟叶收获后,植烟土壤盐分表聚现象严重,表层土壤总盐量达4.17 g/kg,与强度盐化土相当.烟-稻轮作土壤盐分表聚明显强于早地烟土壤,同时,在烟-稻轮作区又以衡阳土壤盐分含量最高,永州和郴州其次:烟-稻轮作区植烟土壤表层盐分离子以N03-、SO42-、Ca2 和K 为主,占总盐量的95.21%.

On Total Salt Amount and Salt Accumulation in Surface Soil in Tobacco Fields in Hunan

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.