35份草本植物镉吸收与富集特征比较

Cadmium tolerance and absorption characteristic of herbaceous plants

选取35份常见草本植物,在室外遮雨条件下采用盆栽方法,研究10mg·kg^(-1)镉(Cd)胁迫下草本植物Cd耐性和富集特征。研究表明:草本植物对10mg·kg^(-1) Cd胁迫有较高耐性,所选35份植物中仅9种植物生长明显受到抑制,根冠比显著降低(P<0.05)的仅有2种;不同植物间Cd吸收和积累差异较大,豆科植物以及暖季型草Cd转运能力优于冷季型草,地上部和地下部Cd含量最高的分别为百脉根(Lotus corniculatus)和草地早熟禾(Poa pratensis),Cd转运系数最大的为披碱草(Elymus dahuricum);聚类分析得出,两种一年生黑麦草(Lolium multiflorum)地上部积累量较高,属于高积累类型草本植物。

Thirty-five varieties of herbaceous plants were selected for studying tolerance and accumulation characteristics of cadmium in pot experiments using 10 mg·kg-1 cadmium treatments.The plants were grown under conditions sheltered from rain.We found that the herbaceous plants had good tolerance against 10 mg·kg-1 cadmium stress,and that the growth of only nine species was significantly inhibited in the experiment on herbaceous plants.In addition,root/shoot ratio decreased significantly(P<0.05)in two species only.Cadmium absorption and accumulation differed among the experimental plants,and the translocation capacity of leguminous plants and warm-season turfgrass were superior to that of cool-season turfgrass.The highest cadmium content in shoots and roots were found in Crowtoe(Lotus corniculatus)and Kentucky bluegrass(Poa pratensis),respectively.The highest cadmium translocation factor was found in Lyme grass(Elymus dahuricum).The result of clustering analysis based on cadmium accumulation in shoots indicated that two varieties of annual ryegrass(Lolium multiflorum)have the highest cadmium accumulation among the herbaceous plants studied.