【摘要】 调查分析了重庆市植烟土壤氯素含量及其与土壤农化特性的关系。结果表明:重庆植烟土壤含氯量低,平均为13.4mg/kg,变幅为痕量～99.7mg/kg,有90%的土壤含氯量在烟草种植区划规定的最适宜植烟的土壤含氯量(≤30mg/kg)范围内,土壤含氯量>45mg/kg不适宜烟草种植的土壤样本仅占3.7%,土壤含氯量≤2mg/kg的缺氯土壤样本占19.2%。重庆植烟土壤类型主要是黄壤,占植烟土壤的75.6%,不同类型土壤平均含氯量依次为黄壤15.2mg/kg>石灰土12.8mg/kg>黄棕壤5.6mg/kg>紫色土5.3mg/kg>水稻土1.8mg/kg。从不同植烟区县土壤含氯量看,以丰都、石柱最低,平均为2.6mg/kg,缺氯土壤占57.0%,55.7%;其次是武隆,平均含氯量为5.8mg/kg;其他区县土壤含氯量在10～22mg/kg范围内。更多还原

【Abstract】 Field investigation and laboratory analysis were carried out to study Cl content in tobacco-planting soils in Chongqing and its relationship with pH organic matter and available NPK in them. Cl content averaged 13.4 mg/kg with the range of trace to 99.7 mg/kg. Cl in 90% of the soil samples was lower than 30 mg/kg, indicating that they are fit for tobacco cultivation. 3.7% of the soil samples had a Cl content higher than 45 mg/kg and were identified as un-suitable for tobacco cultivation, as stipulated in Handbook of Tobacco Planting Division. In 19.2% of the soil samples Cl appeared to be deficient, with a content of <2 mg/kg. The yellow soil, the dominant tobacco-planting soil in Chongqing, accounting for 75.6% of the total, had the highest average Cl content (15.2 mg/kg), followed in sequence by lime soil (12.8 mg/kg), pale brown soil (5.6 mg/kg), purple soil (5.3 mg/kg) and paddy soil (1.8 mg/kg). Of the tobacco-planting counties and districts of Chongqing, Fengdu and Shizhu had the lowest average soil Cl, being 2.6 mg/kg, and 57.0% and 55.7% of the soils there were found to be Cl-deficient. Soil Cl was relatively low in Wulong, being 5.8 mg/kg. In the other counties of Chongqing Municipality, soil Cl varies in the range of 10～22 mg/kg.更多还原