外源铁对铅污染土壤中宽叶香蒲铅积累的影响

采用温室盆栽方法，研究添加外源铁对不同铅浓度(0、100、500和1000 mg·kg^-1)污染土壤中宽叶香蒲铅积累的影响.结果表明： 各铅浓度条件下，与添加100 mg Fe·kg^-1相比，添加500 mg Fe·kg^-1处理的宽叶香蒲地上部和根的铅含量均增高.土壤铅浓度为1000 mg·kg^-1时，添加500 mg Fe·kg^-1处理根的铅含量比100 mg Fe·kg^-1处理增加33.7%，地上部铅含量增加50.5%.添加500 mg Fe·kg^-1处理的根际土壤中可交换态铅比100 mg Fe·kg^-1处理增加77.0%～114.6%.除500 mg·kg^-1铅浓度外，各铅浓度条件下添加500 mg Fe·kg^-1理根干质量均显著低于100 mg Fe·kg^-1处理.在铅污染的湿地环境中添加适量铁可以提高铅的有效性，促进铅积累.

Ectomycorrhiza formation on Pinus tabulaeformis through Rhizopogon luteolus infection

A pot experiment was conducted to study the effects of adding 100 and 500 mg·kg^-1 of exogenous iron (Fe) on the lead (Pb) accumulation in Typha latifolia growing on a soil with 0, 100, 500 and 1000 mg·kg^-1 of Pb, respectively. In treatment 500 mg Fe·kg^-1, the Pb concentration in T. latifolia shoots and roots was higher, compared with that in treatment 100 mg Fe·kg^-1. When the soil Pb concentration was 1000 mg·kg^-1, the Pb concentration in T. latifolia shoots and roots in treatment 500 mg Fe·kg^-1 increased by 33.7% and 50.5%, respectively, compared with that in treatment 100 mg Fe·kg^-1. The exchangeable Pb concentration in rhizosphere soil was 77.0%-114.6% higher in treatment 500 mg Fe·kg^-1 than in treatment 100 mg Fe·kg^-1. When the soil Pb concentration was 0, 100 and 1000 mg·kg^-1, the root dry mass in treatment 500 mg Fe·kg^-1 had a significant decrease, compared with that in treatment 100 mg Fe·kg^-1. It was suggested that adding appropriate amount of Fe to Pb contaminated wetland soil could increase the availability of soil Pb and improve the Pb accumulation in plants.