2种菜心根系分泌物低分子有机酸组成特征及对土壤邻苯二甲酸正二丁酯解吸的影响  

Characteristics of low molecular organic acid composition in the root exudates of two cultivars of Brassica parachinensis L.and their impacts on DBP desorption in soil

作　　者：黄世聪 高嘉辉 周铭基 陈澄宇 曾巧云[1,2] HUANG Shicong;GAO Jiahui;ZHOU Mingji;CHEN Chengyu;ZENG Qiaoyun(College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642,China;Guangdong Provincial Key Laboratory of Agricultural&Rural Pollution Abatement and Environmental Safety,Guangzhou 510642,China)

机构地区：[1]华南农业大学资源环境学院,广州510642 [2]广东省农业农村污染治理与环境安全重点实验室,广州510642

出　　处：《环境工程学报》2023年第11期3629-3636,共8页Chinese Journal of Environmental Engineering

基　　金：广东省自然科学基金资助项目(2022A1515010703);广东省科技计划资助项目(2021B1212040008-20210301)。

摘　　要：为探究邻苯二甲酸正二丁酯(DBP)高/低累积型菜心对DBP吸收累积差异的机理,采用溶液培养和室内批量实验方法,对比研究DBP污染下DBP高/低累积型菜心根系分泌物中低分子有机酸组成特征及其对土壤DBP解吸的影响。研究结果表明,2种菜心根系分泌物中均检测出甲酸、乙酸、草酸和苹果酸,其中草酸和苹果酸为2种菜心根系分泌物中主要的低分子有机酸,其在2种菜心根系分泌物中的质量浓度分别为1.56~9.28和1.06~15.38 mg·L^(-1)。总体来看,特青根系分泌物中低分子有机酸的质量浓度低于油青。添加2种菜心根系分泌物土壤DBP的解吸率分别为45.8%~81.1%(油青)和34.0%~52.5%(特青),显著高于添加蒸馏水处理(17.0%),特青根系分泌物对土壤DBP的解吸率显著低于油青。相关性分析表明,2种菜心根系分泌物对土壤DBP的解吸程度与其草酸或苹果酸质量浓度相关性较弱(r<0.146,P>0.05),这说明低分子有机酸不是2种菜心根系分泌促进土壤DBP解吸作用的主要因素。本研究结果可为DBP低累积作物品种的筛选提供参考。To explore the mechanisms for different absorption and accumulation of the high/low DBP(din-butyl phthalate)-accumulation Brassica parachinensis L.cultivars for DBP,this study used solution culture and indoor batch experiments to compare the composition characteristics of low molecular organic acid in root exudates of high/low DBP-accumulation Brassica parachinensis L and their effects on the desorption of DBP in soil.The results showed that formic acid,acetic acid,oxalic acid,and malic acid were detected in the root exudates of two cultivars of Brassica parachinensis L.,among which oxalic acid and malic acid were the main low-molecular organic acids in the root exudates of the two cultivars.The concentrations of oxalic acid and malic acid were1.56~9.28 and 1.06~15.38 mg·L^(-1),respectively,in the root exudates of the two cultivars.Overall,the mass concentrations of low-molecular organic acids in the root exudates of Teqing were significantly lower than those of Youqing.The desorption percentages of DBP in soil supplemented with the root exudates of the two cultivars were 45.8%~81.1%(Youqing)and 34.0%~52.5%(Teqing),which were significantly higher than those supplemented with distilled water(17.0%).The desorption percentages of the root exudates of Teqing were significantly lower than those of Youqing.Correlation analysis showed that the effects of root exudates of the two cultivars on desorption percentages of DBP from soil were weakly correlated with the mass concentrations of oxalic acid or malic acid in the root exudates(r<0.146,P>0.05),indicating that low-molecular organic acids were not major factors in promoting DBP desorption from soil by the root exudates of the two cultivars.The research conclusions provide scientific basis for the screening of low DBP-accumulation crop species.

关 键 词：根系分泌物 低分子有机酸 解吸 农产品安全 邻苯二甲酸正二丁酯 

分 类 号：X53[环境科学与工程—环境工程]