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强化青葙修复镉污染土壤的柠檬酸施用方式优化试验研究
傅校锋, 刘杰, 龙玉梅, 孟德佳
桂林理工大学
摘要:
采用盆栽试验,研究了以不同时间和次数共10种方式施用柠檬酸对青葙(Celosia argentea Linn.)修复Cd污染土壤及地上部Cd积累量的影响,为筛选最佳的柠檬酸施用方式,提高青葙Cd修复效率提供参考。结果表明:所有处理的青葙各部分生物量均增加,其中移栽前施加柠檬酸,混匀后平衡两周(CA+Bal)处理可显著增加青葙各部分生物量,叶、茎、根及地上部分别比对照(CK)处理增加66.18%、67.22%、65.58% 和66.92%;第4周单次施加柠檬酸(CA+4)处理和第4、5周等量分两次施加柠檬酸(CA+4/5)处理显著增加青葙地上部Cd含量,分别较CK处理增加67.18% 和66.82%;CA+Bal和CA+4/5处理显著增加了青葙地上部Cd积累量,分别比CK处理高139.62%和129.59%。可见,移栽前施加柠檬酸,混匀后平衡两周和第4、5周等量分两次施加柠檬酸处理更有利于提高青葙对Cd污染土壤的修复效率。
关键词:  柠檬酸  施用方式    青葙
DOI:10.13758/j.cnki.tr.2020.01.022
分类号:X53
基金项目:广西科技重大专项(桂科AA17204047)和广西高等学校高水平创新团队及卓越学者计划项目(桂财教函[2018]319号)资助。
Experimental Study on Optimization of Citric Acid Application Method for Remediation of Cadmium-contaminated Soil by Celosia argentea Linn.
FUXIAOFENG, LIUJIE, LongYuMei, MengDeJia
Guilin University of Technology
Abstract:
A pot experiment was conducted to study the effects of applying citric acid at different time and times in 10 ways for remediation of Cd-contaminated soil and cadmium accumulation in shoot by C. argentea for providing the reference for screening the best citric acid application method to improve Cd remediation efficiency by C. argentea. Results revealed that the biomass of each section of C. argentea was increased after the experiment, in which citric acid was applied before transplanting, and balanced for two weeks after mixing (CA+Bal) had the largest effects, the biomass of leaves, stems, roots and aboveground increased than CK treatment by 66.18%, 67.22%, 65.58%, and 66.92%, respectively. In the treatment of citric acid applied a single in the fourth week (CA+4) and the treatment of two equal amounts in the fourth and fifth weeks (CA+4/5), Cd contents in the aboveground were significantly increased than CK treatment by 67.18% and 66.82%, respectively; Cd accumulation in the aboveground parts of C. argentea under the treatments of CA+Bal and CA+4/5 were significantly increased than CK treatment by 139.62% and 129.59%, respectively. Therefore, citric acid can be applied prior to transplanting, and balanced two weeks after mixing and two times in equal in the fourth and fifth weeks to increase the remediation efficiency of Cd-contaminated soil by C. argentea.
Key words:  Citric acid  Application method  Cadmium  Celosia argentea Linn

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