黑麦草分泌有机酸的生物特性对铅污染修复的影响

为了揭示根系分泌有机酸对植物修复效果的影响,该文采用液培试验研究根系分泌有机酸对黑麦草生理特性及重金属pb2+吸收转移的影响.结果表明,黑麦草根系分泌有机酸为草酸、酒石酸、苹果酸、冰乙酸和柠檬酸.0.1～1 mmol/L的内二酸和2～3 mmol/L冰乙酸有利于黑麦草地上和根系干质量的增加.0.1 mmol/L的洒石酸、0.5～l mmol/L的丙二酸、2～3 mmol/L的冰乙酸促进耐性指数的增加.1～3 mmol/L的丙二酸,酒石酸对地上部分Pb2+质量浓度起促进作用,1～3mmol/L的冰乙酸有利于黑麦草 生物量的增加,同时也有利于根系重金属pb2+质量浓度的增加.该研究可为重金属污染的植物修复技术提供参考.

Effect of biological nature of organic acid exudation from ryegrass on phytoremediation of lead pollution

In order to reveal the effect of organic acid exudation from root on phytoremediation effects, liquid culture experiment was adopted to study the effect of organic acid on physiological characteristics and Pb2+ absorption by ryegrass. It showed that organic acid from ryegrass root were oxalic acid, tartaric acid, malic acid, glacial acetic acid and citric acid. 0.1-1 mmol/L malonic acid and 2-3 mmol/L acetic acid increased the amount of dry matter. 0.1mmol/L tartaric acid, 0.5-1mmol/L malonic acid and 2-3 mmol/L acetic acid could increase the patience index. 1-3 mmol/L malonic acid and tartaric acid could increase the accumulation of Pb2+ in ryegrass shoot. 1-3 mmol/L glacial acetic acid could increase the biomass liveweight of ryegrass and the accumulation of heavy metal Pb2+ in root. The study could provide the certain reference foundation to phytoremediation polluted by heavy metal.