叶面喷施纳米羟基磷灰石对苗期小麦生长和镉吸收的影响  

Influence of nano-hydroxyapatite foliar application on wheat growth and cadmium accumulation

作　　者：杨杰 王霞[1] 仓龙[1] YANG Jie;WANG Xia;CANG Long(Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Sciences,Chinese Academy of Sciences,Nanjing 210008,China;College of Resource and Environment,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院南京土壤研究所土壤环境与污染修复重点实验室,南京210008 [2]中国科学院大学资源与环境学院,北京100049

出　　处：《安全与环境学报》2019年第5期1745-1751,共7页Journal of Safety and Environment

基　　金：国家科技支撑计划项目(2015BAD05B04);江苏耕地质量提高与污染防治研究项目(【2015】447号)

摘　　要：纳米羟基磷灰石(NHP,Nano-hydroxyapatite)具有较强的吸附和固定重金属的能力,近年来在重金属污染土壤的钝化修复领域得到重视和应用,但叶面喷施NHP对作物重金属吸收和积累的影响并不清楚,也未见相关报道。通过水培试验对小麦幼苗叶面喷施不同质量分数的NHP(0. 123%、0. 369%、0. 615%),同时与喷施不同质量浓度的KH2PO4溶液和去离子水的处理进行对比,研究其对于小麦生长和Cd吸收积累的影响。结果表明,喷施NHP和KH2PO4没有显著影响小麦的生长速率和生物量;喷施处理显著降低了新叶中的Cd质量比和Cd向新叶的转移系数,NHP处理要明显优于KH2PO4处理,这与叶片中P质量比的增加密切相关。结果表明,NHP有望成为一种新型的叶面阻隔剂,但其对小麦全生育期Cd的吸收和积累影响仍需进一步研究。In this paper,the author intends to apply nanohydroxyapatite( NHP),a immobilization remediation material,to foliar the spray to reduce the transfer of Cd in the wheat plant.For the above purpose,a hydroponic experiment has been conducted to investigate the foliar spray effects with NHP on the growth of the wheat plant and the Cd accumulation at the different concentration rates of NHP,e. g. 0. 123%,0. 369%,and 0. 615%, as compared with the different concentrations of KH2PO4 solution and deionized water. Furthermore,the correlation analysis between Cd and other elements has been investigated to check the effect of the Cd accumulation. The results of our experiment indicate that the growth rate and the biomass of the wheat plant have not been significantly affected by the said spray of KH2PO4 and NHP. And,roughly speaking,the Cd concentration in the root and the originally left-over leaves( the first 3 leaves and their stems) tend to grow significantly taller than those in the control group and the Cd concentration in the new leaf( to be more exact,the 4th leaf) all significantly may turn to be lower than that in the control group due to the different concentrations of NHP spray in the percentages of 0. 3% KH2PO4 and 0. 615% NHP. On the contrary,the spray treatment tends to increase the Cd accumulation in the roots and the originally leftover leaves,which tend to significantly reduce the Cd content in the new leaf and the transfer coefficient of Cd from the root to the new leaf,which would mean much more significance for the NHP treatment than for the KH2PO4 treatment. At the same time,since the spray of KH2PO4 and NHP can increase the content of P that helps to reduce the content of Cd in the 4th leaf of the wheat,it would mean a significant negative correlation between the content of Cd and P by NHP spray. Nevertheless,the introduction of NHP into the plant may impede the transfer of Cd to the new leaf. In addition,the spray of KH2PO4 and NHP treatment ought to increase the content of Cu,Zn,Fe and Mn in the new l

关 键 词：环境科学技术基础学科 镉 纳米羟基磷灰石 小麦 积累 叶面阻隔剂 

分 类 号：X53[环境科学与工程—环境工程]