红叶甜菜-花生和油葵-花生轮作修复土壤Cd的能力

利用生物量高的经济作物进行轮作，可在加快修复土壤Cd污染进程的同时获得一定的经济效益。本研究在长沙市望城区群力村Cd轻度污染的土壤进行冬季种植红叶甜菜、夏季复种植花生和春末种植油葵、夏季复种植花生的轮作模式试验，探究重金属修复潜力。结果表明：花生、油葵、红叶甜菜各部位Cd富集系数除花生果实外均大于1，对Cd均有较强的富集能力。油葵-花生、红叶甜菜-花生轮作模式种植一季可提取土壤Cd总量分别为40.80 g·hm^-2和53.34 g·hm^-2。红叶甜菜-花生轮作将土壤Cd含量由0.316 mg·kg^-1降至0.286 mg·kg^-1，油葵-花生轮作一季将土壤Cd含量由0.316 mg·kg^-1降至0.283 mg·kg^-1。研究表明，红叶甜菜-花生、油葵-花生轮作模式均对土壤重金属Cd有较好的修复潜力。

Ability of red leaf beet-peanut and oil sunflower-peanut rotation patterns to remediate soil Cd

Rotation of cash crops with large biomass can accelerate the process of soil Cd pollution remediation and achieve certain economic benefits. In this study, two plant rotation patterns were carried out in soil mildly contaminated with Cd (Qunli Village, Wangcheng District, Changsha City, China) to explore their remediation potential for heavy metal pollution in soil. The red leaf beet and peanuts were grown in winter and summer, respectively, for the first pattern and the oil sunflower and peanuts were planted in late spring and summer, respectively, for the second pattern. The experiment results demonstrated that, except peanut seed, the Cd bioaccumulation coefficients in all parts of peanut, oil sunflower, and red leaf beet were greater than 1, exhibiting superior Cd accumulation ability. The total amount of soil Cd extracted in the rotation cultivation mode of oil sunflower-peanut and red leaf beet-peanut was 40.80 g·hm^-2 and 53.34 g·hm^-2, respectively. Red leaf beet-peanut rotation could reduce the content of Cd from 0.316 mg·kg^-1 to 0.286 mg·kg^-1, and oil sunflower-peanut rotation could reduce the content of Cd from 0.316 mg·kg^-1 to 0.283 mg·kg^-1 in soil. Both rotation patterns showed considerable capability for the remediation of Cd contaminated soil.