镧-铅复合污染下AM真菌对玉米生长和镧、铅吸收的影响

发布时间：2018-02-10 09:40

本文关键词： 丛枝菌根真菌镧铅吸收转运　出处：《环境科学》2017年09期 　论文类型：期刊论文

【摘要】：采用温室盆栽试验的方法,模拟不同程度的镧-铅复合污染土壤(50、200、800 mg·kg~(-1)),研究接种丛枝菌根(arbuscular mycorrhizal,AM)、真菌Claroideoglomus etunicatum(CE)和Rhizophagus intraradices(RI)对玉米(Zea mays L.)菌根侵染率、生物量、矿质营养元素吸收、C∶N∶P生态化学计量比、稀土镧(La)和重金属铅(Pb)吸收、转运的影响,旨在为稀土-重金属复合污染土壤的治理和修复提供科学依据.结果表明,AM真菌CE和RI均与玉米建立了共生关系,平均菌根侵染率为26.7%~95.8%;随着La-Pb复合污染含量的增加,玉米植株菌根侵染率、地上部和根部生物量以及N、P、K、Ca、Mg这5种矿质营养元素含量显著降低,而玉米植株C∶P和N∶P以及地上部和根部La、Pb含量显著增加.接种2种AM真菌使玉米植株生物量显著提高了17.8%~158.9%,地上部和根部P含量显著提高了24.5%~153.8%,降低了C∶P和N∶P,符合生长速率假设.在3种程度La-Pb复合污染含量土壤上,AM真菌使玉米植株根部Pb含量显著增加了51.3%~67.7%,地上部Pb含量显著降低了16.0%~67.7%,Pb从玉米根部向地上部的转运率降低了31.5%~54.7%;同时,接种AM真菌显著增加了轻度LaPb复合污染土壤上玉米植株的La含量,在中度La-Pb复合污染土壤上却显著减少了玉米地上部的La含量,增加了玉米根部的La含量,抑制了La从根部向地上部的转运,重度La-Pb复合污染土壤上均没有显著影响.试验结果初步证明,AM真菌具有促进稀土-重金属复合污染土壤植物修复的潜力,对于稀土-重金属复合污染土壤生态系统的植被恢复具有潜在应用价值.
[Abstract]:Pot experiment in greenhouse was used to simulate the infection rate and biomass of mycorrhizal fungi inoculated with arbuscular mycorrhizal rhizome (AMN) and Rhizophagus intraradicus (Ri) on maize (Zea mays L.) at different levels of lanthanum and lead in the soil of 800 mg 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) ~ (-1), and inoculated with arbuscular mycorrhizal mycorrhizal rhizome (AMN), fungi (Claroideoglomus et Unicom) and Rhizophagus intraradica (Ri). The effects of absorption and Transport of Mineral nutrient elements on absorption and Transport of rare Earth La (La) and heavy Metal Pb (Pb), C: n: P Eco-stoichiometric ratio, The results showed that the symbiotic relationship between CE and RI was established with maize, and the average mycorrhizal infection rate was 26.775%. The mycorrhizal infection rate, aboveground and root biomass, and the contents of five mineral nutrient elements, N, P, K, Ca, mg, were significantly decreased in maize plants. The biomass of maize plant increased significantly by inoculation with two AM fungi, the biomass of maize plant increased by 17.8% and 158.9%, the P content of shoot and root increased significantly by 24.53.8%, and decreased the content of CP and N: P, which was in line with the growth of maize plant, and increased significantly the contents of C: P and N: P in maize plant, and increased the biomass of maize plant by inoculation with two kinds of AM fungi, and the content of P in shoot and root increased significantly by 24.53.8. Rate hypothesis. The root Pb content of maize plant was significantly increased by AM fungi at three levels of La-Pb compound pollution soil, and the aboveground Pb content was significantly decreased by 16.0% ~ 67.7%. The transport rate of Pb from maize root to shoot decreased by 31.5% ~ 54.7%; at the same time, Inoculation with AM fungi significantly increased La content of maize plants in mildly polluted soil with LaPb, but significantly decreased La content in upper part of maize field and increased La content in maize root in moderate La-Pb compound polluted soil. The La transport from root to shoot was inhibited, and there was no significant effect on the soil polluted by La-Pb. The results showed that AM fungi had the potential of promoting phytoremediation of the soil contaminated by rare earth and heavy metals. It has potential application value for vegetation restoration of soil ecosystem polluted by rare earth and heavy metals.
【作者单位】：内蒙古大学生态与环境学院;
【基金】：国家自然科学基金项目(41461071,31200421,40861018) 内蒙古自然科学基金项目(2012MS0603) 教育部科学技术研究重点项目(210032) 中国博士后科学基金项目(20100471489)
【分类号】：X17;X53

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