甜高粱对镉污染农田的植物修复效果

Phytoremediation Effectiveness of Sweet Sorghum on Cadmium-Contaminated Farmland

本文旨在研究甜高粱对重金属胁迫的生理响应及其结合生物质炭和菌根用于Cd污染农田土壤的修复效果。试验用土采自湖南长沙县北山镇的表层污染农田土壤,以探明3个水平的生物炭添加量以及接种与不接种摩西球囊霉菌处理对甜高粱产量、含糖量和重金属含量的影响。结果表明,接种菌根和添加生物炭均能够明显增加甜高粱的产量,在生物炭添加量为1%并接种菌根的情况下效果最好,增产幅度达到了50%;接种菌根促进了甜高粱根系对土壤中有效态镉的吸收,降低土壤中有效态镉的含量,且其降低效果随着生物炭添加量的增加而增加,添加生物炭和接种菌根能够提高甜高粱蔗糖含量,对还原糖含量没有影响。结合甜高粱产量、含糖量以及土壤修复效果,采用添加1%生物质炭并接种菌根的处理效果最为理想。

This paper was to investigate the physiological response of sweet sorghum to heavy metals stress and validate the effectiveness for phytoremediation of Cd-contaminated soils by this energy plant combined with biochar and mycorrhizae. The test soil was collected from Beishan Town, Changsha County, Hunan Province of China. The effects of three biochar additions and inoculation with Glomus mosseae on the yield, sugar content and heavy metal content of sweet sorghum were evaluated via a greenhouse study. The results showed that inoculation with mycorrhizal fungi and addition of biochar exerted a positive effect in terms of the yield, sugar content and heavy metal content of sweet sorghum. Both mycorrhizal and biochar additions significantly increased the yield of sweet sorghum, up to 50% increase rate, which was achieved in the treatment of 1% biochar addition associated with mycorrhizal inoculation. The addition of biochar and inoculation of mycorrhizae increased the sucrose content in the stem of sweet sorghum, but had no influence on the reducing sugar content. Taking into the yield, sugar content and soil remediation effect into account, the treatment of 1% biochar addition associated with mycorrhizal inoculationwas recommended due to its ideal performance.