番茄对酸性黄壤中铅的吸收特性与富集效果

通过盆栽试验,研究番茄对酸性黄壤中铅(Pb)的吸收和积累效应。试验结果表明,当土壤中加入不同比例的铅时(0～200mg/kg),基本没有观察到铅对番茄的毒害病症,铅对作物的生长发育没有明显的影响;但番茄具有强烈吸收土壤中铅的特性,并在番茄体内积累。随土壤中铅添加量的提高,番茄铅吸收量增加,其中根系的吸收最强,明显高于叶、茎和果实,特别是当土壤中铅添加量较高时,差异更为显著。在土壤铅浓度较低时,番茄对土壤铅的富集率较高(4.38%),当酸性黄壤中铅的浓度大于50mg/kg时,可引起番茄中铅含量超标。

Characteristics of Pb absorption and accumulation by tomato in acid yellow soil

A pot experiment was conducted to study the absorption and accumulation characteristics of tomato to lead (Pb) in acid yellow soil. The results showed that added Pb to soil with the rates of 0—200mg/kg did not cause obvious adverse effects on tomato seedlings. Pb in the soil could easily be absorbed by tomato and accumulated in different parts. The Pb uptake increased with the Pb added in soil, and the Pb content in root of tomato was higher than that in stem, leaf and fruit, especially at high rate of Pb added. There was a higher accumulation rate (4.38%) of Pb in tomato in lower Pb content soil. The Pb content in tomato fruits might be over than the regulation of food limit, when the Pb (content) exceeded 50mg/kg in soil.