三种植物对土壤镉的富集效果研究

Research on enrichment effect of cadmium by three plants in soil

为筛选出适应中轻度重金属镉(Cd)污染农田的富集植物,以生物质高粱、甜高粱(Sorghum bicolor‘Dochna’)和蓖麻(Ricinus communis L.)为材料,通过田间试验研究这3种植物的生长情况及其对Cd的富集特征。结果表明,生物质高粱地上部生物量为22.5748 t/hm^(2),是甜高粱和蓖麻地上部生物量的1.2、5.1倍。3种富集植物各器官中Cd的富集含量均表现为茎秆>叶片>穗,生物质高粱和甜高粱茎秆和叶片中Cd的富集系数均超过1。生物质高粱、甜高粱和蓖麻当季地上部可移除Cd的总量分别为24.66、17.72、1.57 g/hm^(2)。在3种富集植物中,生物质高粱生物量最大,对Cd富集能力强,是一种潜在的Cd污染修复植物资源。

In order to screen out cadmium-enriched plants that can adapt to slightly and moderately heavy metal contaminated farmland,field experiments were carried out to study the growth and the enrichment characteristics of cadmium of three plant species(biomass sorghum,sweet sorghum and castor)in a cadmium contaminated farmland.The results showed that the above-ground biomass of biomass sorghum was 22.5748 t/hm^(2),which was 1.2 and 5.1 times that of sweet sorghum and castor.The Cd concentrations in each organ of the three plants were in the order of stalk>leaf>ear.The Cd enrichment coefficients in the stalks and leaves of biomass sorghum and sweet sorghum all exceeded 1.The total amount of Cd that can be removed from the shoots of biomass sorghum,sweet sorghum and castor in the season was 24.66,17.72 and 1.57 g/hm^(2),respectively.Among the three plants,biomass sorghum has the largest biomass and has a strong ability to accumulate Cd,and is a potential plant resource for the remediation of Cd contaminated farmland.