微咸水灌溉对农田土壤镉污染植物修复效率的影响  

Effect of irrigation with saline water on phytoremediation of soil contaminated by Cadmium

作　　者：沈兴凤 郝英君 任翊卓 唐希望 SHEN Xingfeng;HAO Yingjun;REN Yizhuo;TANG Xiwang(Beidaihe District River Lake Chief Service Center,Qinhuangdao 066000,China;Hebei Engineering Research Center for Ecological Restoration of Seaward Rivers and Coastal Waters,Hebei University of Environmental Engineering,Qinhuangdao 066102,China)

机构地区：[1]河北省秦皇岛市北戴河区河湖长服务中心,河北秦皇岛066000 [2]河北环境工程学院入海河流及近岸海域生态修复河北省工程研究中心,河北秦皇岛066102

出　　处：《灌溉排水学报》2024年第11期100-106,共7页Journal of Irrigation and Drainage

基　　金：河北省高等学校科学技术研究项目(BJ2021049);河北省自然科学基金项目(D2019415034);秦皇岛市科学技术研究项目(202301A053)。

摘　　要：【目的】探究高矿化度水灌溉对植物镉修复效率的影响。【方法】采用盆栽试验方法,探究不同镉污染条件下(外源镉质量分数为0、5、10、15 mg/kg)3种灌溉水(W1:去离子水、W2:天然微咸水、W3:与W2等矿化度的氯化钠盐水)对玉米植株镉吸收及植株镉累积的影响。【结果】(1)W2、W3处理玉米幼苗株高、根长、地上部干质量、地上部鲜质量、根干质量、根鲜质量均低于W1处理;土壤外源镉质量分数从0增加到15mg/kg时,W1处理各生长指标呈下降趋势,W2、W3处理各生长指标下降趋势不显著;(2)当土壤外源镉质量分数为5、10、15 mg/kg时,玉米地上部和根部镉质量分数表现均为W3处理>W2处理>W1处理;(3)当土壤外源镉质量分数较低(5、10 mg/kg)时,W2、W3处理玉米地上部镉累积量均显著低于W1处理(P<0.05);当土壤外源镉质量分数较高(15 mg/kg)时,W1、W2、W3处理玉米地上部镉累积量均无显著差异(P>0.05),而W1、W2、W3处理玉米根部镉累积量在土壤外源镉质量分数为5、10、15mg/kg时均无显著差异(P>0.05)。【结论】盐分和镉胁迫均会抑制玉米植株生长和镉吸收从而影响单株镉累积量,但当土壤镉质量分数较高时,盐分对玉米植株镉累积量影响可以忽略。因此在淡水缺乏而微咸水丰富地区可以考虑在高镉污染土壤植物修复过程中采用微咸水灌溉以节约淡水资源。【Background and Objective】Cadmium contamination is a ubiquitous soil environmental problem facing agricultural production in many countries.Phytoremediation is an environmentally friendly technique.Since bioavailability of Cd varies with biogeochemical environment which,in turn,is regulated by soil water,irrigation is likely to have an important influence on efficacy of phytoremediation.This paper presents the results of an experimental study on the effect of irrigation with saline water on phytoremediation of Cd-contaminated soil.【Method】Pots filled with soil containing Cd at content of 0,5,10 and 15 mg/kg were used in the experiment.All pots were grown with maize and were irrigated with deionized water(W1),natural saline water(W2),and water with NaCl at the same salinity as W2(W3).In each treatment,we measured Cd absorption by the maize.【Result】①When the soil Cd content was low,irrigation with saline water resulted in a reduction in plant height,root length,as well as in dry and fresh biomasses of both above and below-ground parts.However,an increase in soil Cd content significantly inhibited maize plant growth only in treatment W1,while no significant effects were observed in treatments W2 and W3.②When Cd content was 5,10,or 15 mg/kg,the impact of irrigation water on Cd content in the above-and below-ground parts of the maize seedlings was ranked in the order of W3>W2>W1.③When soil Cd content was 5 and 10 mg/kg,Cd accumulation in the above-ground parts of the maize seedlings was significantly lower in W2 and W3 than in W1(P<0.05),while when soil Cd content was 15 mg/kg,there were no significant differences in Cd accumulation in the above-ground parts of the maize between the three water treatments(P˃0.05).When soil Cd content was 5,10 or 15 mg/kg,there was no significant difference in Cd accumulation in the roots of the maize between the three water treatments(P˃0.05).【Conclusion】Irrigating maize with saline water reduces phytoremediation efficiency of Cd-contaminated soil when soil Cd

关 键 词：微咸水 土壤镉污染 灌溉 植物修复 

分 类 号：X53[环境科学与工程—环境工程]