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植物根系活性对菲浓度的响应——以栾树、樟树为例
荆诚然, 姚文艺, 肖培青, 申震洲, 焦鹏, 马力
黄河水利科学研究院 水利部黄土高原水土流失过程与控制重点实验室, 河南 郑州 450003
摘要:
[目的]分析栾树、樟树根系分泌物在菲胁迫下的变化特征,为筛选抗多环芳烃污染树种,进一步开展植物修复多环芳烃污染提供科学依据。[方法]设置3种菲处理浓度[L0(CK,0 mg/kg);L1(100 mg/kg);L2(1 000 mg/kg)],通过盆栽试验的方法,对栾树、樟树的根系分泌物中总有机碳(TOC)、全碳(TC)、全氮(TN)含量及根系活性进行测定。[结果]①随着菲浓度的升高,栾树与樟树根系分泌物中TOC与TC含量均呈下降趋势,TN含量则呈先升后降的趋势;②随着菲浓度的升高,栾树和樟树根系的总吸收面积和活跃吸收面积总体呈下降趋势;③3个处理水平下,栾树根系分泌物中TC,TOC,TN含量均高于樟树,且栾树根系总吸收面积和活跃吸收面积也高于樟树。[结论]通过菲胁迫下栾树与樟树根系分泌量和根系活性的比较,表明栾树相较于樟树对菲具有更好的耐受性。
关键词:  根系分泌物  根系活性  菲浓度
DOI:10.13961/j.cnki.stbctb.2019.04.027
分类号:S714;S719
基金项目:国家重点研发计划项目"鄂尔多斯高原砒砂岩区生态综合治理技术与示范"(2017YFC0504503);自然资源部地质调查项目"砒砂岩风化机理与侵蚀防治技术"(DD20190504);国家自然科学基金项目"黄丘区草被对坡面产流过程的调控机理及临界研究"(41601301)
Response of Plant Root Activity on Phenanthrene Concentration—Taking Koelreuteria Paniculata and Cinnamomum Camphora as Examples
Jing Chengran, Yao Wenyi, Xiao Peiqing, Shen Zhenzhou, Jiao Peng, Ma Li
Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau of Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou, He'nan 450003, China
Abstract:
[Objective] The changes of root exudates of Koelreuteria paniculata and Cinnamomum camphora under phenanthrene(PHE) were analyzed in order to provide scientific basis for screening tree species resistant to polycyclic aromatic hydrocarbons pollution and further phytoremediation of polycyclic aromatic hydrocarbons pollution.[Methods] Three concentrations of phenanthrene[L0(CK, 0 mg/kg), L1(100 mg/kg), L2(1 000 mg/kg)] were set up in this experiment. Total organic carbon(TOC), total carbon(TC), total nitrogen(TN) and root activity in root exudates of Koelreuteria paniculata and Cinnamomum camphora trees were determined by pot experiment.[Results] ① With the increase of phenanthrene concentration, the contents of TOC and TC in root exudation of Koelreuteria paniculata and Cinnamomum camphora decreased, while the contents of TN increased first and then decreased with the increase of phenanthrene concentration; ② With the increase of phenanthrene concentration, the total absorption area and active absorption area of roots of Koelreuteria paniculata and Cinnamomum camphora showed a downward trend. ③ Under the three treatments, the contents of TC, TOC and TN in root exudates of Koelreuteria paniculata were higher than those of Cinnamomum camphora, and the total and active absorption areas of Koelreuteria paniculata root were also higher than those of Cinnamomum camphora.[Conclusion] By comparing root exudation and root activity of Koelreuteria paniculata and Cinnamomum camphora under phenanthrene stress, it showed that Koelreuteria paniculata had better tolerance to phenanthrene than Cinnamomum camphora.
Key words:  root exudates  root exudates  concentration of phenanthrene