| 侯晓龙,刘爱琴,蔡丽平,周垂帆,吴鹏飞,邹显花,马祥庆.Pb胁迫对百喜草生长和Pb积累的影响[J].农业环境科学学报,2014,33(12):2303-2308. |
| Pb胁迫对百喜草生长和Pb积累的影响 |
| Effects of Pb Stress on Growth and Pb Accumulation of Paspalum notatum |
| 投稿时间：2014-08-08 |
| DOI：10.11654/jaes.2014.12.004 |
| 中文关键词: 百喜草 Pb胁迫 生长指标 根系形态 富集特征 |
| 英文关键词: Paspalum notatum lead stress growth index root morphology accumulation |
| 基金项目:国家自然科学基金项目(41401364);国家科技支撑计划项目(2014BAD15B02);国家林业局林业公益性行业科研项目(201304303);农业高校产学合作科技重大项目(2013N5002);福建农林大学林学院院青年基金项目(6112C039J) |
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| 中文摘要: |
| 以水土保持先锋植物百喜草为试验材料,设置不同Pb浓度的室内模拟胁迫试验,定量测定不同浓度Pb处理下百喜草生长及体内重金属含量,分析百喜草对Pb胁迫的耐性及其富集效果.结果表明:百喜草在土壤Pb浓度2500 mg·kg-1条件下仍可生长;Pb胁迫对百喜草各生长指标均有一定抑制作用,地上部分表现为分蘖能力>叶最大伸展>苗高,根系表现为根体积>根平均直径>总根长>根表面积;轻度Pb胁迫条件下百喜草根系生物量分配较多,随Pb浓度的增大,生物量分配倾向于地上部分;百喜草对Pb具有一定富集能力,根系和地上部分最高分别为3384.56 mg·kg-1和200.70 mg·kg-1,根系对Pb的富集能力远大于地上部分,表现出较弱的转移能力. |
| 英文摘要: |
| Paspalum notatum is a saline- and drought-tolerant perennial grass and is often used as an erosion-controlling soil stabilizer. However, little information is available about its tolerance to Pb. Here we designed a pot experiments to examine the growth and metal content of Paspalum notatum under various Pb stress. The results showed that the maximum tolerance of P. notatum to Pb stress was 2500 mg·kg-1, but Pb stresses had inhibitory effects on plant growth and development. The inhibition was in order of tillering capacity > maximum leaf elongation > seedling height, and root volume > average root diameter > total root length > root surface area. In low Pb levels, plant biomass allocated more in the roots than in the aboveground; however, biomass accumulation in the aboveground increased with increasing Pb stress. Paspalum notatum accumulated Pb in root biomass, with relatively low Pb transfer. The maximum concentrations of Pb in roots and aboveground were 3 384.56 mg·kg-1 and 200.70 mg·kg-1, respectively. |
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