| 外源柠檬酸、苹果酸和草酸对披碱草镉耐受及富集的影响 |
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| 引用本文： | 薛博晗,李娜,宋桂龙,李诗刚,濮阳雪华,李金波.外源柠檬酸、苹果酸和草酸对披碱草镉耐受及富集的影响[J].草业学报,2018,27(6):128-136. |
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| 作者姓名： | 薛博晗 李娜 宋桂龙 李诗刚 濮阳雪华 李金波 |
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| 作者单位： | 1.北京林业大学草坪研究所,北京 100083; 2.深圳市铁汉生态环境股份有限公司,广东 深圳 518040 |
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| 基金项目： | 深圳市铁汉生态环境股份有限公司(THRD008)，中央高校基本科研业务费专项资金(YX2015-10) |
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| 摘 要： | 采用盆栽试验研究了不同浓度(1、2、4 mmol·L-1)外源柠檬酸、苹果酸、草酸处理下,披碱草地上部和根部生物量、Cd含量的变化,披碱草根系形态参数变化以及生长状况变化,为揭示有机酸影响披碱草吸收、转运和富集Cd的机理提供理论依据。结果表明:Cd50处理,披碱草株高、根长和各部分生物量均显著降低(P<0.05);3种外源有机酸处理,均可以提高披碱草Cd含量和生物量。在镉积累方面,草酸效果最佳,Cd50+OA2处理时,披碱草转运系数达1.38,地上部Cd积累量达到最大值268.511 μg·plant-1。从改善植物生长状况方面,柠檬酸处理效果更好,Cd50+CA4处理时,根系和地上部生物量分别是Cd50处理组的1.82和1.53倍。综合分析表明,外源有机酸能强化披碱草修复Cd污染土壤,提高植物修复效率。
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| 关 键 词： | 披碱草 有机酸 Cd胁迫 植物修复 |
| 收稿时间： | 2017-10-31 |
| 修稿时间： | 2018-01-11 |
Effects of exogenous citric,malic and oxalic acids on the tolerance and enrichment efficiency of Elymus dahuricus under cadmium-stress |
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| XUE Bo-han,LI Na,SONG Gui-long,LI Shi-gang,PUYANG Xue-hua,LI Jin-bo.Effects of exogenous citric,malic and oxalic acids on the tolerance and enrichment efficiency of Elymus dahuricus under cadmium-stress[J].Acta Prataculturae Sinica,2018,27(6):128-136. |
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| Authors: | XUE Bo-han LI Na SONG Gui-long LI Shi-gang PUYANG Xue-hua LI Jin-bo |
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| Affiliation: | 1.Institute of Turfgrass Science, Beijing Forestry University, Beijing 100083,China; 2.Shenzhen Techand Ecology & Environment Co.,Ltd, Shenzhen 518040,China |
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| Abstract: | A study has been undertaken to investigate the effects on Elymus dahuricus of different concentrations (1,2,4 mmol·L-1) of exogenous citric, malic and oxalic acids on the biomass, Cd content in above-ground plant and root, and changes in morphological parameters and plant growth. Pot culture tests were carried out under Cd stress to reveal how organic acids affect the absorption, transport and accumulation of Cd. The main results are as follows. When treated with Cd50, plant height, root length and biomass significantly reduced (P<0.05). The three exogenous organic acids could increase the content of Cd and biomass in the roots and shoots of E. dahuricus. In terms of cadmium accumulation, oxalic acid had the strongest effects; under Cd50+OA2 treatment conditions, the E. dahuricus translocation coefficient was 1.38 and Cd concentration in shoots reached the maximum value of 268.511 μg·plant-1. On the other hand, from the point of view of improving plant growth, the citric acid treatment performed best; under Cd50+CA4 treatment conditions, the root and shoot biomass were 1.82 and 1.53 times higher than that of Cd50. Comprehensive analysis shows that the three exogenous organic acids can strengthen Cd-contaminated E. dahuricus. The use of these acids is likely to be an effective way to improve the phytoremediation efficiency of soils contaminated by heavy metals. |
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| Keywords: | Elymus dahuricus organic acid Cd stress phytoremediation |
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