龙眼对镉的吸收分布特性及耐性研究

以三年生可开花结果的盆栽松风本龙眼为试材,研究镉处理后龙眼体内镉含量变化及植株生长效应。结果表明,龙眼吸收的镉,大部分停留在根内,少量向地上的叶和果转移,各器官镉的含量依次为根> 叶> 果。龙眼对镉具有较强的耐性,即使土壤外加镉量达400 mg/kg,其植株外观也未出现明显的毒害症状,但果的镉含量已严重超标。

Cadmium Absorption, Distribution and Tolerance in Longan

The experiment was carried out using pot-cultured three-year-old longan trees to determine the variation of cadmium(Cd) content and growth of longan plant after Cd applied to soil.The results showed that more of the absorbed Cd assembled in the roots and less transferred to the leaves and fruits.The order of Cd content from high to low in different parts of longan was root,leaves and fruit.Longan tree had strong tolerance to Cd stress.When applied Cd 400mg/kg to soil,there was no significant toxic symptom on the plant,but the content of Cd in fruit was seriously excessive.