• ISSN 1008-505X
  • CN 11-3996/S
谭长强, 何琴飞, 秦玉燕, 申文辉, 刘秀, 曹艳云. 施氮对镉胁迫下杂交相思树生长及镉吸收分配的影响[J]. 植物营养与肥料学报, 2017, 23(5): 1326-1334. DOI: 10.11674/zwyf.17011
引用本文: 谭长强, 何琴飞, 秦玉燕, 申文辉, 刘秀, 曹艳云. 施氮对镉胁迫下杂交相思树生长及镉吸收分配的影响[J]. 植物营养与肥料学报, 2017, 23(5): 1326-1334. DOI: 10.11674/zwyf.17011
TAN Zhang-qiang, HE Qin-fei, QIN Yu-yan, SHEN Wen-hui, LIU Xiu, CAO Yan-yun. Effect of nitrogen application on seedling growth and cadminm uptake and distribution in Acacia mangium × Acacia auriculiformis under cadmium stress[J]. Journal of Plant Nutrition and Fertilizers, 2017, 23(5): 1326-1334. DOI: 10.11674/zwyf.17011
Citation: TAN Zhang-qiang, HE Qin-fei, QIN Yu-yan, SHEN Wen-hui, LIU Xiu, CAO Yan-yun. Effect of nitrogen application on seedling growth and cadminm uptake and distribution in Acacia mangium × Acacia auriculiformis under cadmium stress[J]. Journal of Plant Nutrition and Fertilizers, 2017, 23(5): 1326-1334. DOI: 10.11674/zwyf.17011

施氮对镉胁迫下杂交相思树生长及镉吸收分配的影响

Effect of nitrogen application on seedling growth and cadminm uptake and distribution in Acacia mangium × Acacia auriculiformis under cadmium stress

  • 摘要:
    目的研究不同水平氮的供应对木本固氮植物杂交相思树适应镉环境胁迫及其生物修复能力的影响,可为有目的地进行相思树栽培提供施肥依据。
    方法以杂交相思树 (Acacia mangium × Acacia auriculiformis) 为试材进行了盆栽试验。Cd2+ 设3个水平(0、30、60 mg/kg),在Cd2+ 30 mg/kg的基础上设施尿素2个水平(0.4、0.8 g/kg) ,共5个处理。研究了杂交相思幼苗的干物质、氮(N)、磷(P)、钾(K)、镉(Cd)的积累和分配规律。
    结果Cd2+ 胁迫显著抑制了杂交相思幼苗根、茎、叶和总干物质的积累,限制了N、P、K等元素的吸收和积累;杂交相思Cd转移系数为0.044~0.224,根Cd含量明显高于茎和叶,并且根部Cd累积能力要大于地上部;但Cd2+ 60 mg/kg胁迫下,杂交相思通过向地上部分转移Cd以更好地适应强胁迫环境。Cd2+ 30 mg/kg胁迫下,高氮 (0.8 g/kg) 较低氮 (0.4 g/kg) 更显著地促进了茎、叶和植株总的P、K积累,而低氮更有效地增加了根的N、P、K积累量;高氮较低氮更显著地提高了茎、叶干重以及干物质在茎叶中的分配比例,低氮则提高了根干重以及干物质在根中的分配比例和根冠比;Cd2+ 胁迫下施氮显著促进了杂交相思对Cd的吸收和积累,提高了Cd转移系数;低氮更显著地促进了根、叶和总Cd的积累,高氮更显著地促进了茎Cd的积累及Cd在茎、叶中的分配比例。
    结论Cd2+ 胁迫下杂交相思通过改变干物质及N、P、K、Cd积累和分配规律以及提高N、P和K利用率的方式,保证根系生长,以更好地适应胁迫环境。低Cd2+ 胁迫下 (30 mg/kg),施氮可缓解杂交相思由镉胁迫所引起的对N、K吸收的抑制,促进杂交相思各器官干物质以及N、P、K、Cd的积累。低施氮量 (尿素 0.4 g/kg) 促进相思树生长的效果更佳,高施氮量 (尿素 0.8 g/kg) 促进Cd向地上部的运转,提高其对Cd生物修复能力。

     

    Abstract:
    ObjectivesThe adaptation and bioremediation capability of Acacia mangium × Acacia auriculiformis were studied under different nitrogen and cadmium stress levels for providing support for scientific fertilization of the target cultivation of Acacia mangium × Acacia auriculiformis.
    MethodsA pot experiment was carried out with two cadmium stress levels of Cd2+ 30 and 60 mg/kg and two urea levels of 0.4 and 0.8 g/kg soil. The accumulation and distribution of dry matter, N, P, K and Cd in shoots and roots of the trees were analyzed.
    ResultsThe cadmium stress significantly inhibited dry matter accumulation in roots, stems and leaves of Acacia mangium × Acacia auriculiformis, and also reduced the N, P and K absorption and accumulation. The Cd transfer coefficients of the plant were from 0.044 to 0.224 when treated with different Cd concentrations. The concentrations of Cd in roots were significantly higher than those in stems and leaves, and the accumulation ability of Cd in roots was higher than that in shoots. In order to adapt to the environment better, the Acacia mangium × Acacia auriculiformis transferred more Cd from roots to shoots under the high Cd stress. Under the Cd2+ stress of 30 mg/kg, the high N increased P and K contents and accumulations in shoots, while the low N increased P and K contents in roots. The high N was more efficient in accumulation and distribution of dry matter in shoots, while the low N showed the same performance in roots. The nitrogen fertilization promoted the absorption and accumulation of Cd in the plants and improved the Cd transfer coefficients when treated with different Cd concentrations. The low nitrogen significantly promoted the Cd accumulation in roots, leaves and plants, and the high nitrogen significantly promoted the Cd accumulation in stems and the allocation proportion of Cd in stems and leaves.
    ConclusionsNitrogen fertilization could alleviate the limitation of N and K absorption of Acacia mangium × Acacia auriculiformis in 30 mg/kg Cd concentration and promote accumulation of dry matter, N, P, K and Cd. The low nitrogen is good for better growth of the plant, and the high nitrogen performs better in promoting the transferring of Cd to the aboveground of Acacia mangium × Acacia auriculiformis, which is required for the ability of the Cd bioremediation.

     

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