
AM真菌对蜈蚣草根围土壤砷形态及其砷吸收的影响
Effects of arbuscular mycorrhizal fungi on arsenic fractionation in rhizosphere soil and arsenic accumulation by Pteris vittata
为探明AM真菌对蜈蚣草Pteris vittata根围土壤砷形态及其吸收砷的效应,采用盆栽实验,接种摩西管柄囊霉Funneliformis mosseae(Fm)、幼套近明球囊霉Claroideoglomus etunicatum(Ce)和变形球囊霉Glomus versiforme(Gv)。实验结果表明:接种Ce处理对蜈蚣草根围pH影响不显著,但提高了根围土壤中非专性吸附态砷、结晶水合铁铝氧化物结合态砷比例,分别达35%和13%,同时降低了无定形和弱结晶水合铁铝氧化物结合态砷、残渣态砷比例,分别达3%和11%。蜈蚣草生物量及其体内砷浓度分别提高了111%和15%。研究表明接种Fm或Ce处理相比接种Gv处理对提高根围土壤中弱吸附态砷比例或降低较强吸附态砷比例的效果更好。而与接种Fm和Gv处理相比,接种Ce处理对提高蜈蚣草生物量及砷浓度、砷累积量的效果更显著。接种Ce可显著提高蜈蚣草对砷的提取效率,研究结果为蜈蚣草-AM真菌联合修复As污染土壤提供了技术指导。
Potted Pteris vittata plants were inoculated with Funneliformis mosseae (Fm), Claroideoglomus etunicatum (Ce) and Glomus versiforme (Gv) for observing the effects of arbuscular mycorrhizal fungi on arsenic fractionation in rhizosphere soil and arsenic accumulation in plants. The experiment results showed that the effect of inoculating Ce on the rhizosphere pH of Pteris vittata was not significant, but Ce could increase the proportion of non-specifically sorbed arsenic and well-crystallized hydrous oxides of Fe- and Al-associated arsenic by 35% and 13% and simultaneously decreased amorphous and poorly-crystallized Fe and Al (hydr) oxide-associated arsenic by 3% and 11% respectively. Ce could also significantly increase the biomass and arsenic concentration of Pteris vittata by 111% and 15% respectively. As compared with Gv, inoculation of Fm or Ce was more effective on increasing soil weakly adsorbed arsenic or reducing strongly adsorbed arsenic. Ce had more significant effects on increasing the biomass and arsenic concentration and accumulation of Pteris vittata than Fm and Gv. The results come to the conclusion that the extractive efficiency of arsenic by Pteris vittata inoculated with Ce is evident and AM fungi-Pteris vittata combination is feasible for bioremediation of As contaminated soil.
砷 / AM真菌 / 蜈蚣草 / 形态分级 {{custom_keyword}} /
arsenic / AM fungi / Pteris vittata / fractionation {{custom_keyword}} /
表1 砷胁迫下接种不同AM真菌对根围土壤As形态的影响Table 1 Effects of inoculation with different AM fungi on As speciation in rhizosphere soil under arsenic stress |
处理 Treatment | F1 (mg/kg) | F2 (mg/kg) | F3 (mg/kg) | F4 (mg/kg) | F5 (mg/kg) |
---|---|---|---|---|---|
CK | 1.50±0.12b | 38.49±1.11a | 126.36±2.32a | 183.11±5.74a | 222.93±14.20a |
Fm | 1.58±0.04ab | 33.45±1.40b | 106.12±0.95b | 176.83±3.20a | 172.15±8.46b |
Ce | 1.73±0.04a | 36.22±1.01ab | 104.99±4.22b | 177.25±2.40a | 169.86±0.87b |
Gv | 1.45±0.08b | 21.90±2.09c | 108.38±1.82b | 193.34±3.55a | 179.25±6.67b |
Note: Different lowercases in same list indicate significant difference (P<0.05). | |
注:表中数据为平均值±标准误差,同列数据不同小写字母表示处理间差异显著(P<0.05) |
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The authors have declared that no competing interests exist.
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