摘要
研究植物对的铀耐受性及其富集特性对修复铀污染土壤具有重要意义。研究在外源施加铀浓度150 mg·kg^(–1)土壤环境中,研究5种十字花科(芥菜、小白菜、红油菜、花菜、白萝卜)植物在高浓度铀胁迫下的耐受性,对铀的富集及提取特性,并采用赋值法比较各植物的综合富集能力。结果表明:高浓度铀条件对不同植物的影响有明显的差异,其中白萝卜的耐受性最好;红油菜的地上部、地下部和单株铀含量最高分别为126.65 mg·kg^(–1)(干重)、770.84 mg·kg^(–1)(干重)、241.9 mg·kg^(–1)(干重)。红油菜的单株富集系数最大为1.61,白萝卜的铀积累量最大为0.24 mg,且转运系数都小于0.5,最大的白萝卜也只有0.42。通过综合评价分析,红油菜的综合评价值最高,在修复土壤铀污染方面具有潜在利用价值。
Studies of the resistance and accumulation ability of different plant species to uranium（U） has important influence on the bioremediation of U contaminated soil. The research was conducted to study the five cruciferous plants（Brassica juncea（L.） Czern. et Coss., Brassica rapa L.Chinensis Group, Brassica compestris L. var.purpurea Bailey, Brassica oleracea L. var. botrytis L., Raphanus sativus L.） biomass, enrichment amount and extraction property of U under soil culture with the addition of 150 mg·kg^（-1）. Moreover, this study took advantage of evaluating method to deal with enriching properties of plants. Results showed that different plant species reacted apparent differences under the treatment of high concentration uranium, and the tolerance of Raphanus sativus L. was the best among all of the species. The U content in the shoots, roots and per plant of Brassica compestris L. var. purpurea Bailey was the highest and amounted to 126.65 mg·kg^（-1）（dry weight）, 770.84 mg·kg^（-1）（dry weight） and 241.91 mg·kg^（-1）（dry weight）. And its individual enrichment coefficient also was the highest. The accumulation amount of Raphanus sativus L. was the highest and amounted to 0.24. Uranium contents in roots were bigger than shoots among all the species and all of the translation coefficients were under 0.5. Raphanus sativus L. had the best result but only reached 0.42. According to the comprehensive evaluation and analysis, the highest comprehensive evaluation value of Brassica compestris L.var.purpurea Bailey is the highest and has potential utilization value in the bioremediation of U contaminated soil.
出处
《生态科学》
CSCD
2017年第4期58-63,共6页
Ecological Science
基金
国防基础科研项目资助(16zg6101)
四川省物质资源利用与改性工程中心项目(14tdgc01)
西南科技大学生命科学与工程学院本科生创新实践项目
关键词
十字花科植物
铀
富集
cruciferae plants
uranium
enrichment
