【摘要】 以热带地区一种生物量极大的经济作物剑麻(AgaveSisalanaPerrineexEngelm)作为研究对象,采用网室砂培,对Pb在该植物体内的吸收特性、累积分布及迁移规律进行了初步的探索。试验表明,Pb处理浓度低于1300mg·kg-1时对剑麻生长影响较小,但Pb加入浓度达到15900mg·kg-1时,显著抑制了剑麻的生长,其生物量仅为对照的6.7%。剑麻对Pb有很强的吸收性,并分布在其植株的各个部位,其中根系的吸收性最强,是地上部的3.0～13.6倍。Pb处理浓度为12700mg·kg-1时,剑麻地上部和根系的吸收量最大,分别为2220.3和22544.8mg·kg-1,是对照的65.6和221.3倍,且地上部迁移量高达55.87mg·株-1,说明剑麻对修复Pb污染土壤有一定的潜力,因而为今后探明植物积累Pb的机理和Pb污染土壤的植物修复提供了一种新的种质资源。更多还原

【Abstract】 Sisals is an economical plant with high biomass,widely distributed in tropical area. Accumulation,distribution and transference of Pb ions in the plant were researched by using pot experiment in this study. The result showed that sisals grew normally when the lead concentration was below 1 300 mg·kg-1,but the growth of sisals was obviously restrained at 15 900 mg·kg-1 of lead,with the biomass being only 6.7% of CK. The sisals showed a strong ability to uptake lead. The absorbed Pb by sisal was mainly stored in the root system,3.0~13.6 times as many as in the shoots. The absorption amount of Pb reached a peak both in shoots and root at the lead concentration of 12 700 mg·kg-1,the maximum quantity being 2 220.3 mg·kg-1 in shoots and 22 544.8 mg·kg-1 in roots,65.6 and 221.3 times more than that of CK respectively,and the total translocation of heavy metal was up to 55.89 mg·plant-1. These suggested that sisal had the potential of remediation of Pb polluted soil,which provided a new genetic resource for phytoremediation of Pb polluted soil. More effective approaches of amendment and ecological restoration of polluted soil can be developed and put into practice.更多还原