4种草本植物对酸性黄壤中铅的吸收特性研究

研究4种草本植物（黑麦草、狗牙根、早熟禾、翦股颖）对重金属铅的吸收积累规律,为生态环境建设提供科学依据。采用盆栽试验,分别测定地上部与根部铅含量,计算地上部铅含量/根系铅含量（S/R）,根系耐性指数,富集系数4个指标。4种植物地上部和根系中的铅含量与土壤中铅含量呈显著的正相关,相关系数都大于0.90;综合4个指标,对铅的抗性相对顺序为翦股颖〉黑麦草〉早熟禾〉狗牙根。在较高铅离子浓度处理下,4种植物外观没有表现出明显的胁迫现象,特别是黑麦草和翦股颖在重金属Pb含量高达3000 mg/kg的污染土壤上,能够忍耐并正常生长,更适合于Pb污染土壤的修复。

Characteristics of Pb Uptake by Four Herbaceous in Acid Yellow Soil

A study was carried out to explicate the characteristics of Pb uptake by four herbaceous(Lolium perenne,Cynodon dactylon,Poa annua,Agrostis stolonifera)in acid yellow soils,in order to provide scientific basis for improvement of the ecological environment.Adopt a pot experiment,determined the concentration of lead in the roots and shoots of the four herbaceous.S/R,bioaccumulation coefficient,total heavy metal translocation of lead,root tolerance index of the four herbaceous were also investigated.Correlation analysis between Pb contents in plants and Pb-added concentration in soil four kinds was marked,coefficient of correlation were greater than 0.90;To sum up the four indexes,the resistance to lead was Agrostis stolonifera>Lolium perenne>Poa annua>Cynodon dactylon,four plants without stress,especially can endure and grow normally in the pollution soil of 3 000 mg Pb/kg,suited much more for phytoremediation of Pb-contaminated soils.