【摘要】 研究了烟田地膜覆盖栽培和裸栽条件下烟田土壤中镁、硼、铜、锌、氯等中微量元素变化规律。结果表明,土壤中交换性镁、水溶性硼、有效锌有一定的迁移性,但土壤对其的吸持能力相对较强,使肥料附近土壤持续维持较高的含量。土壤有效铜移动性较差,试验中3种栽培方式下,各有效铜在土层中分布较为均匀。有效氯在土壤中有一定的移动性,这在覆膜条件下表现较为明显。地膜覆盖条件下,0～2cm表土层的养分较难被烟株利用;裸栽条件下,除肥料附近土壤外,各土层中微量元素含量基本相似,且随时间变化不大。更多还原

【Abstract】 The movement of magnesium, boron, zinc, copper and chlorine in tobacco field covered and uncovered by plastic film was investigated. Result show that the exchangeable magnesium, soluble boron and available zinc moves easier, but they also can be absorbed or fixed by soil easily, which led to their higher contents in the soil layer where fertilizer applied. Available copper does not move so easily and is well-distributed in soil under three different cultivating practices. Available chlorine moves easily while tobacco field is covered by plastic film. Mineral nutrients on top soil(0～2cm) is difficult to be absorbed by plant if tobacco field is covered by plastic film. While tobacco field is uncovered by plastic film, contents of microelements in different soil layers except where fertilizer applied are similar and change little in the period of tobacco growing.更多还原