柠檬酸对间作小花南芥和玉米的铅富集特征  

Effect of Citric Acid on Characteristics of Lead Enrichment by Intercropping A.alpina and Zea mays

作　　者：牛婷婷 杨昌浪 刘翠 祖艳群[1] 王吉秀 NIU Tingting;YANG Changlang;LIU Cui;ZU Yanqun;WANG Jixiu(College of Resources and Environment,Yunnan Agricultural University,Kunming 650201,China)

机构地区：[1]云南农业大学资源与环境学院,云南昆明650201

出　　处：《环境科学与技术》2025年第3期87-95,共9页Environmental Science & Technology

基　　金：国家自然科学基金项目(41967049,41761073)。

摘　　要：为了验证间作体系下根系分泌柠檬酸对超富集植物小花南芥(Arabis alpina L.var.parviflora Franch)和玉米(Zea mays L.)铅(Pb)富集特征的影响,文章设置Pb(1000 mg/kg)胁迫下,外源添加不同浓度柠檬酸(0、5、25、50 mmol/kg)的盆栽实验,研究外源添加柠檬酸对土壤pH、有效态Pb含量,植物根系形态、株高、生物量、Pb富集特征的影响。结果表明:与对照相比,随着柠檬酸浓度增加单作和间作根际土壤pH显著降低,5 mmol/kg柠檬酸处理,间作土壤中有效态Pb的含量显著(P<0.05)增加6.16%;间作小花南芥的株高、地上部、地下部生物量均显著增加15.32%、41.21%、22.22%,玉米的株高、地上部、地下部生物量显著增加32.25%、184.82%、173.08%;间作小花南芥地下部Pb含量显著增加10.14%。50 mmol/kg柠檬酸处理下,间作玉米地上部和地下部Pb含量显著降低14.18%和48.39%。25 mmol/kg柠檬酸处理下,间作小花南芥和玉米地上部柠檬酸含量分别增加118.55%和114.29%。外源添加柠檬酸能够改变土壤pH和有效态Pb的含量,显著增加植物体内柠檬酸浓度,提高间作小花南芥地下部对Pb的富集,抑制间作玉米对Pb的富集。This study highlights the verification of the response of citric acid secreted from root to the characteristics of Pb enrichment by A.alpina and Zea mays in intercropping system.Thereby,pot experiments were performed with test condition set up:respective addition of 0,5,25 and 50 mmol/kg citric acid,under Pb stress(1000 mg/kg),investigating the effects of citric acid on pH value of soil,available Pb content,root morphology,plant height,biomass and Pb enrichment characteristics.The results obtained showed that in contrast to the control,in the condition of mono-culture and intercropping,pH value of the rhizosphere soil decreased significantly with the increase of citric acid concentration;when citric acid concentration was 5 mmol/kg,the content of available Pb in intercropping soil went up significantly(P<0.05),an increase of 6.16%.the plant height,shoot and root biomass of intercropping A.alpina remarkably increased by 15.32%,41.21%and 22.22%,respectively,and plant height,shoot and root biomass of Zea mays considerably increased by 32.25%,184.82%and 173.08%,respectively;when citric acid content increased to 50 mmol/kg,Pb content of the shoot and root parts of intercropping Zea mays decreased by 14.18%and 48.39%,respectively;as citric acid content was 25 mmol/kg,the citric acid content in the root part of intercropping A.alpina and Zea mays rose by 118.55%and 114.29%,respectively.In brief,the addition of citric acid can alter the pH value of soil and the content of available Pb;in addition,the concentration of citric acid in plants increased consider⁃ably,which could enhance the enrichment of Pb in the root part of intercropped A.alpina,and thus could inhibit the enrich⁃ment of Pb in intercropped Zea mays.

关 键 词：柠檬酸 PB 间作 植物生长 累积特征 

分 类 号：X53[环境科学与工程—环境工程] X173