微生物强化蜈蚣草累积土壤砷能力的研究

Enhancement of As-Accumulation by Pteris vittata L. Affected by Microorganisms

研究了外源添加微生物对蜈蚣草吸收砷能力及其根系参数的影响．通过室内盆栽试验研究表明，施放线菌PSQ、shf2和细菌Ts37、C13处理能明显促进植物生长．其中，shf2处理效果最显著，其生物量、根系活力和根系体积分别达11．5g／pot、2．01μg/（g·h）、38．3mL．施菌处理蜈蚣草植株砷含量均高于对照（CK）处理，其中Ts37处理地上部砷含量达最高837mg／kg，比同期CK处理高出206％；shf2处理地下部砷含量最高，达427mg／kg，比同期CK处理高出88％．施用shf2菌的蜈蚣草砷积累总量最高，达5804μg／pot，比同期CK处理高出136％．4种微生物处理在45d内植物修复效率为8．9％-11．3％．施用微生物可有效提高蜈蚣草累积砷的能力，且以放线菌shf2效果最好．

A pot experiment was carried out to study the root character and As accumulation of Pteris vittata L. affected by actinomycete PSQ, sht2 and bacteria Ts37, C13. The results indicated that growth of the fern was improved by the microorganisms. The biomass, root activity and root volume of shf2 treatment were 11.5 g/pot, 2. 01 μg/（g · h） , 38.3 mL,which were higher than those of other microorganisms treatments. Arsenic concentrations in the plants treated by the microorganisms were higher than that of the control treatment. The As concentration of leaves in Ts37 treatment was up to 837 mg/kg, 206% more than that of the control. The As concentration of root treated by shf2 is 427 mg/kg, 88% more than that of the control. The arsenic accumulation by the plant in microorganism treatments was higher than that of the control, especially shf2 treatment up to 5 804 μg/pot, 136% more than that of the control. The phytoremediation efficiency of the fern in greenhouse experiment after 45d was from 8.9% to 11.3%. The ability of Asaccumulation of Pteris vittata is greatly enhanced by application of microorganism, and actinomycete shi2 is proved as the perfect one.