农业环境科学学报2012，Vol.31Issue(2)：284-291,8.
Pb胁迫对红椿(Toona ciliata Roem)生长发育及Pb富集特性的影响
Effects of Pb Stress on the Growth, Development and Pb Enrichment Properties of Toona ciliata Roem Saplings
摘要
Abstract
To character the growth and Pb enrichment properties of Toona ciliata under Pb polluted soils, leaf length, leaf area, biomass, and Pb concentration in organs of one-year-old T. Ciliata samplings were investigated under different Pb treatments (0 mg·kg-1, 200 mg·kg-1, 450 mg·kg-1 and 2 000 mg·kg-1) in acid purple soil, alkaline purple soil and alluvial soil in western Sichuan, China. T. Ciliate showed good growth characteristics in three soil types, especially in alkaline purple soils. Increased Pb stress obviously inhibited leaf growth regardless of soil substrate. The highest Pb stress(2 000 mg·kg-1) significantly(P＜0.01) reduced leaf length and area in comparison with control. Pb stress obviously changed the root/shoot ratio of the samplings and increased leaf litters. The total biomass was decreased significantly (P＜0.01) with the increase of Pb stress but the biomass in the highest Pb stress only decreased to 81.47% of the biomass in control. Pb concentration in T. Ciliate samplings was positively(P＜0.01) related to Pb concentration in soil. Compared with other organs, fine roots displayed the highest Pb concentration. Few obvious variations of Pb concentration were observed among leaf, shoot, petiole and litter. The Pb tolerance indices of T. Ciliate samplings were from 0.67 to 1.06 depending on Pb stress and soil substrates. The tolerance index decreased with the increase of Pb stress. The enrichment and transfer efficiencies were lower than 0.3. The results revealed that T. Ciliate could have a good growth in the soils with severe Pb pollution, wich could be a potential tree specie for Pb phytoremediation in western Sichuan.关键词
红椿/Pb胁迫/耐性/植物修复/土壤类型Key words
Toona ciliata Roem/ Pb stress/ patience/ phytoremediation/ soil type分类
资源环境引用本文复制引用
胡方洁,张健,杨万勤,吴福忠,刘洋,刘凯,闫邦国,黄旭..Pb胁迫对红椿(Toona ciliata Roem)生长发育及Pb富集特性的影响[J].农业环境科学学报,2012,31(2):284-291,8.基金项目
国家"十二五"科技支撑计划(2011BAC09B05) （2011BAC09B05）
"十一五"科技支撑计划项目(2006BAC01A11) （2006BAC01A11）
国家自然科学基金项目(30872014) （30872014）
四川省"十一五"重大公益性项目(2007NGY006) （2007NGY006）
