四川农业大学学报 ›› 2021, Vol. 39 ›› Issue (5): 575-581.doi: 10.16036/j.issn.1000-2650.2021.05.002

• 林学 • 上一篇    下一篇

氮添加对美洲黑杨镉吸收、富集与分配的影响

雷浩, 高陈晨, 陈良华*, 陈娜, 郝林婷, 柳奇, 舒锟, 杨林凯   

  1. 长江上游林业生态工程四川省重点实验室/长江上游森林资源保育与生态安全国家林业和草原局重点实验室/华西雨屏区人工林生态系统研究长期科研基地/四川农业大学生态林业研究所,成都 611130
  • 收稿日期:2021-06-11 出版日期:2021-10-30 发布日期:2021-11-01
  • 通讯作者: *陈良华,副教授,主要从事植物生理研究,E-mail:sicauchenlh@126.com。
  • 作者简介:雷浩,本科生。
  • 基金资助:
    四川省科技计划资助(2021YFYZ0032, 2019YJ0416); 国家级大学生创新创业训练计划资助项目(201910626050)

Effects of Nitrogen Application on Cadmium Absorption, Enrichment and Distribution in Populus deltoides

LEI Hao, GAO Chenchen, Chen Lianghua*, CHEN Na, HAO Linting, LIU Qi, SHU Kun, YANG Linkai   

  1. Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province & National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River & Rainy Area of West China Plantation Ecosystem Permanent Scientific Research Base, Institute of Ecology & Forestry,Sichuan Agricultural University,Chengdu 611130,China
  • Received:2021-06-11 Online:2021-10-30 Published:2021-11-01

摘要: 【目的】 研究氮添加条件下美洲黑杨不同器官Cd富集和分配的变化,探讨氮沉降对美洲黑杨重金属富集、转移、分配的影响。【方法】 以美洲黑杨(Populus deltoides)为对象,采用盆栽控制实验的方法,研究不同Cd污染处理(0、2.5和5 mg/kg)下,不同氮添加水平(0、5、10和15 g/(m2·a))对美洲黑杨各器官中Cd含量、积累量及分配模式的影响。【结果】 镉污染条件下,氮添加对美洲黑杨多数器官的镉富集具有促进作用,这种促进效应因污染程度的不同有一定的差异;氮添加会增加美洲黑杨镉的富集系数,并降低镉向地上部分的转移;不同Cd污染条件下,美洲黑杨根系中镉含量随根序的增加而降低,适度添加氮(如10 g/(m2·a))能促进镉在低级根中的富集。【结论】 在不同重金属污染条件下,适度的外源氮添加有利于促进美洲黑杨的生长,提高美洲黑杨的镉富集效率,有利于提高其对重金属污染土壤的修复能力。

关键词: 镉污染, 氮沉降, 美洲黑杨, 生物富集

Abstract: 【Objective】 To study the changes of Cadmium (Cd) enrichment and distribution in different organs of P. deltoides under nitrogen addition, and to explore the effects of nitrogen deposition on the enrichment, transfer and distribution of heavy metals in P. deltoides. 【Method】 Taking P. deltoides as material, a pot control experiment was conducted to study the effects of different nitrogen levels (0, 5, 10 and 15 g/(m2·a)) on Cd concentration, accumulation and distribution. pattern in different organs of P. deltoides under different Cd pollution treatments (0.12, 2.5 and 5 mg/kg). 【Result】 Under Cd pollution,nitrogen addition can promote Cd enrichment in most organs of P. deltoides, and this promotion effect depended on Cd pollution degree; nitrogen addition can increase the bio-concentration factors of Cd in P. deltoides and reduce the transfer rate of Cd to aerial parts; under different Cd pollution conditions, Cd content in roots of P. deltoides decreased with the increase of root order, and moderate addition of nitrogen (such as 10 g/(m2·a)) promoted the enrichment of Cd in low-grade roots. 【Conclusion】 Under different heavy metal pollution conditions, moderate addition of exogenous nitrogen is beneficial to promote the growth of P. deltoides, improve Cd enrichment efficiency of P. deltoides and improve its remediation ability to heavy metal contaminated soil.

Key words: Cd pollution, N deposition, Populus deltoides, bio-accumulation

中图分类号: 

  • S718.43