2种城市绿化树种根系分泌物对芘胁迫的响应  

Response of root exudates in two greening tree species exposed to pyrene

作　　者：章帆[1,2] 闫文德 王姣龙[1,3] 李际平 ZHANG Fan;YAN Wende;WANG Jiaolong;LI Jiping(Central South University of Forestry&Technology,Changsha 410004,Hunan,China;Shenzhen-Hongkong Institution of Industry,Education&Research Environmental Technique Co.,Ltd.,Shenzhen 518057,Guangdong,China;National Engineering Laboratory for Applied Technology of Forestry and Ecology,Changsha 410004,Hunan,China)

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]深圳市深港产学研环保工程技术股份有限公司,广东深圳518057 [3]南方林业生态应用技术国家工程实验室,湖南长沙410004

出　　处：《中南林业科技大学学报》2018年第11期123-130,共8页Journal of Central South University of Forestry & Technology

基　　金：湖南省科技计划项目(2015SK2002);国家林业公益性科研专项(201404316)

摘　　要：为分析不同浓度芘胁迫下植物根系分泌物的变化情况,进一步研究多环芳烃污染环境的植物修复机理提供科学理论和参考。选取栾树、樟树为试验对象,测定在不同芘浓度胁迫下(L_0:0 mg/kg;L_1:500 mg/kg;L_2:2 000 mg/kg)两种树种的根系分泌物的组成成分、总碳、总氮含量及根系活力吸收面积、磷酸酶活性吸收面积及其生长形态。结果表明:不同浓度芘胁迫下,2种绿化树种根系分泌物种类均发生明显变化,栾树根系分泌物中检测到化合物种类顺序为:L_1(20种)> L_2(19种)> L_0(15种);樟树根系分泌物中检测到化合物种类顺序为:L_1(14种)> L_2(9种)> L_0(7种)。不同浓度的芘胁迫改变了植物根系的活性吸收能力,且低浓度的胁迫可以促进植物的生长。本研究可为城市绿化树种去除土壤中的多环芳烃提供科学参考。The changes of plant root secretion under different concentrations of pyrene stress were analyzed to provide scientific theories and references for further study on phytoremediation mechanism of PAHs(polycyclic aromatic hydrocarbons)pollution environment.Koelreuteria paniculata and Cinnamomum camphora were selected as experimental objects,and tested under different concentrations of pyrene(L0:0 mg/kg;L1:500 mg/kg;L2:2 000 mg/kg).The components of root secretion,the contents of TC(technetium),TN(total nitrogen),the absorption area of root activity,the absorption area of phosphatase activity and the growth morphology of root secretion of the two species were studied.The results showed that:the species of root secretion of two greening tree species changed obviously under different concentrations of pyrene stress,and the order of species of compounds detected in the root secretion of Koelreuteria paniculata was as follows:L1(20 Kinds)>L2(19 Kinds)>L0(15Kinds);The order of compounds detected in root exudates of Cinnamomum camphora was as follows:L1(14 Kinds)>L2(9 Kinds)>L0(7 Kinds).Different concentrations of pollutants of stress changed the active absorption ability of plant roots,and low concentration stress could promote the growth of plants.This study will serve as a scientific reference for the removal of PAHs(polycyclic aromatic hydrocarbons)from soil of urban greening trees.

关 键 词：栾树 樟树 芘 根系分泌物 根系活性 根际修复 

分 类 号：S792[农业科学—林木遗传育种]