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林业科学 ›› 2014, Vol. 50 ›› Issue (7): 23-30.doi: 10.11707/j.1001-7488.20140704

• 论文与研究报告 • 上一篇    下一篇

不同种源麻栎幼苗对Cd2+-Pb2+复合污染的吸收累积特性

王君, 严小莉, 李凌   

  1. 西南大学园艺园林学院 重庆 400716
  • 收稿日期:2013-09-11 修回日期:2013-11-12 出版日期:2014-07-25 发布日期:2014-07-04
  • 基金资助:

    “十二五”国家科技支撑计划项目“重庆市麻栎良种繁育基地建设和丰产栽培技术示范”(2011BAD22B08)。

Absorption and Accumulation Characteristics of Quercus acutissima Seedlings in Different Provenances Under the Combined Pollution of Cd2+ and Pb2+

Wang Jun, Yan Xiaoli, Li Ling   

  1. College of Horticulture and Landscape Architecture, Southowest University Chongqing 400716
  • Received:2013-09-11 Revised:2013-11-12 Online:2014-07-25 Published:2014-07-04
  • Contact: 李凌

摘要:

在田间试验条件下,研究重庆巫山、武隆和河南灵宝种源麻栎幼苗在土壤Cd2+-Pb2+复合污染下对Cd2+和Pb2+的吸收累积特性。结果表明:在土壤不同程度Cd2+-Pb2+复合污染下,3个种源麻栎幼苗根中Cd2+,Pb2+平均含量分别为0.235~12.460,7.428~370.268 mg·kg-1;茎中Cd2+,Pb2+平均含量为0.115~7.588,4.757~142.960 mg·kg-1;叶中Cd2+,Pb2+平均含量为0.072~4.772,2.873~61.923 mg·kg-1。3个种源麻栎幼苗体内Cd2+,Pb2+的含量和富集系数均表现为根>茎>叶。Cd2+-Pb2+共存对麻栎幼苗吸收累积Cd2+ 和Pb2+似有明显的交互作用,Pb2+促进幼苗各器官对Cd2+的吸收累积;Cd2+促进幼苗根部对Pb2+的吸收积累,抑制地上部对Pb2+的吸收累积。Cd2+-Pb2+复合污染下,麻栎幼苗对Cd2+的富集和转移能力大于Pb2+。河南灵宝种源麻栎可尝试用于修复土壤重度Cd2+污染,重庆巫山种源麻栎可尝试用于修复土壤中度Pb2+污染。

关键词: 麻栎, Cd2+, Pb2+, 复合污染

Abstract:

This article investigated the absorption and accumulation characteristics of Q. acutissima seedlings of different provenances (Wushan and Wulong, Chongqing and Lingbao, Henan) under the combined pollution of Cd2+ and Pb2+ in the field. The result showed that, under the combined pollution of Cd2+ and Pb2+ in soil, the average contents of Cd2+ and Pb2+ in roots of Q. acutissima seedlings were 0.235-12.460 mg·kg-1, 7.428-370.268 mg·kg-1, the average contents in the stem were 0.115-7.588 mg·kg-1, 4.757-142.960 mg·kg-1, and the average contents in the leaf were 0.072-4.772 mg·kg-1, 2.873-61.923 mg·kg-1. The contents and bioconcentration coefficient of Cd2+ and Pb2+ in the seedlings of the three provenances were in an order of root > stem > leaf. Under the Cd2+ and Pb2+combined pollution, there was an obvious interaction between Cd2+ and Pb2+ for the absorption and accumulation in Q. acutissima seedlings. Pb2+ promoted the accumulation of Cd2+ in each organ of the seedlings. Cd2+ promoted the accumulation of Pb2+ in the root, and inhibited Pb2+ to accumulate in aboveground part. The accumulation and transport capacities of Cd2+ were greater than that of Pb2+ in the seedlings. The seedlings of Lingbao,Henan provenance could be applied to repair the heavily polluted soil by Cd2+, while the seedlings of Wushan,Chongqing provenance could be applied to repair the moderately polluted soil by Pb2+.

Key words: Quercus acutissima, Cd2+, Pb2+, combined pollution

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