摘要
采用室内盆栽实验,利用柴油设置2 g·kg-1(L1),10 g·kg-1(L2)和50 g·kg-1(L3)模拟PAHs浓度梯度,对盆栽的1年生樟树幼苗对PAHs的修复机制及影响因子进行研究。结果表明:(1)不同浓度PAHs污染(L1、L2、L3)水平下,樟树幼苗土壤中PAHs的去除率分别为85.86%、91.95%、80.80%,均高于无植物处理。(2)PAHs在樟树不同器官中的积累浓度不同。中、低浓度污染处理水平(L2、L1)下,樟树各器官对PAHs的积累作用均表现为:叶>根>干;高浓度污染处理水平(L3)下则表现为根>叶>干。不同污染处理(L1、L2、L3)水平下,樟树吸收累积作用修复PAHs污染土壤的贡献率分别为64.26%、22.81%、11.39%。(3)随着PAHs污染浓度的增大,樟树不同部位生物浓缩系数逐渐减小。叶和根是樟树富集PAHs的主要部位。(4)5cm土壤温度和多酚氧化酶是影响樟树修复PAHs污染土壤的关键因子,真菌、放线菌数量和磷酸酶活性可以作为土壤PAHs污染评价的生物指标。研究结果可为南方城市PAHs污染修复优良绿化树种的筛选提供理论依据。
By pot experiments in greenhouse, phytoremediation and its impact factor were investigated for one-year-old Cinnamomum camphora treated with unplanted soils (control) and at three diesel concentrations (2 g·kg^-1 (L1) , 10 g·kg^-1 (L2) and 50g·kg^-1 (L3) ) to stimulate different levels of PAHs pollution. The results show that the removal rates of PAlls by C. camphora were 85.86%, 91.95% and 80.80% at L1, L2 and L3 levels, and all were higher than unplanted treatment; PAHs accumulations in the organs of C. camphora were different, at L2 and L1 levels, the accumulation of PAHs by C. camphora was in an order: leaf〉root〉stem, while it was root〉leaf〉stem at L3 levels; and the contribution rates for PAils phytoremediation by absorption and accumulation of C. camphora were 64.26%, 22.81% and 11.39% at L1, L2 and L3 levels; the bio-concentration factors became smaller with the increase of PAHs pollution, and leaf and root were the important organs for C camphora to enrich PAHs; the temperature at 5 cm soil and polyphenol oxidase were the key factors for PAHs phytoremediation by C. camphora; the fungi, actinomycetes population and phosphatase activity were suggested as the biological indicators of soil PAHs pollution. The findings could provide a theoretic evidence for screening good trees which have great effect on remediation of PAHs pollution.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2012年第12期176-180,共5页
Journal of Central South University of Forestry & Technology
基金
国家自然科学基金项目(31070410
30571487
30771700
30870455)
教育部新世纪优秀人才支持计划(NCET-10-0151)
长沙市科技局项目(K1003009-61)
中南林业科技大学青年科学研究基金重点项目(QJ2010008A)资助
关键词
樟树
植物修复
多环芳烃
柴油
微生物数量
酶活性
土壤温度
Cinnamomum camphora
phytoremediation
polycyclic aromatic hydrocarbons
diesel oil
microbial population
enzyme activities
soil temperature