接种AM真菌对Cu污染土壤中紫云英吸收N P K的影响

以盆栽试验法分析了在土壤Cu水平为0、20、50、100、150mg·kg-1的条件下,接种Glomusintraradices,接种Glomusmosseae及混合接种Glomusintraradices、Glomusmosseae对宿主植物紫云英吸收N、P、K的影响。结果表明,与不接种相比,接种AM真菌显著提高了宿主植物对N、P、K的吸收,土壤中Cu浓度越高,接种处理对紫云英吸收N、P、K的效果越显著。在Cu污染土壤中接种AM真菌增加宿主植物对N、P、K等营养元素的吸收有可能是宿主植物对Cu污染抗性提高的原因之一。

Effect of Arbuscular Mycorrhizal Fungi on Uptake of N, P and K by Astragalus sinicus L. in Copper Polluted Soil

In a pot experiment we examined the effect of inoculating Astragalus sinicus L with Glomus intraradices, Glomus mosseae and their mixture on the uptake of nitrogen, phosphorus and potassium in copper polluted soil. The result showed that the uptake of nitrogen, phosphorus and potassium decreased both in aboveground part and underground part of Astragalus sinicus L with the increase of copper content in the soil. Compared to the non-inoculated control, the inoculation increased the uptake of nitrogen, phosphorus and potassium, which varied with the inoculation fungi, Glomus intraradices was more effective than Glomus mosseae, suggesting Glomus intraradices had more resistance to copper than Glomus mosseae. In polluted soil the symbiosis of AM fungi and the plant can extend the area of root and improve the nutrition of plant. Inoculating the AM fungi which can resist heavy polluted soil could help the remediation of polluted environment, since the inoculation improved the plant growth by increasing the uptake of nutrients such as nitrogen, phosphorus and potassium.