| Mangroves are widely distributed in tropical and subtropical beaches，in recentyears，With the population living in coastal areas increasing, large quantities ofpollutants directly or indirectly are Poured into the estuaries making the growingpressure on the environment of the mangrove ecosystem. In which，Polycyclicaromatic hydrocarbons pollution is one of the major pollutants，which has a strongrole in the carcinogenic and teratogenic effects and mutagenic "three letter" role，because of those more and more the concern of scientists from various countries. Thevast majority of Polycyclic aromatic hydrocarbons of the toxicity by a series ofderivatives after the change is not only diminished but a sharp increase. Polycyclicaromatic hydrocarbons widely distributed, present in the food, drinking water,decorative materials, which are people’s daily contact with, so always endangerpeople’s lives. scientists from various countries focused on the enrichment ofmangrove roots and absorption about Polycyclic aromatic hydrocarbons research ofremoval efficiency,decomposing bacteria separation and applications, as well ascomprehensive utilization of the plant–bacteria,but, permeability, the quantitativemechanism of Polycyclic aromatic hydrocarbons and mangrove roots of oxygen alsorarely. Proven mechanism of ROL and the Removal efficiency of PAHs is favor ofcoastal mangrove species selection and breeding of eco-environmental restoration andprovide a reliable scientific basis for the planning and development of mangrovewetlands, which is of great theoretical and practical significance for their conservationand sustainable development. This study is going to explore the relationship betweenthe mangrove ROL and removal efficiency of PAHs by three indoor cultureexperiments of mangrove species, Experiment one mainly compare different ROL ofdifferent mangrove species with the removal efficiency of PAHs; Experiment two inorder to explore direct regulation of mangroveROL to the degradation of polycyclicaromatic hydrocarbons; In Experiment3, to study the effect of indirect control of the mangrove ROL as to remove Polycyclic aromatic hydrocarbons. Experiment onechoose four mangrove plants (A.ilicifolius,A.corniculatum,B.gymnorrhiza,K. obovata)treatmented in the two kinds of the PAHs(polycyclic aromatic hydrocarbon)bydifferent Concentrations In different treatment by the different PAHs concentrations,To compare ROL with the removal efficiency of PAHs；With the non-species-specificcorrelation analysis about ROL and degradation rate of PAHs，quantitatively study theROL，s role in the degradation of PAHs (phenanthrene and pyrene). The secondexperiment intended hrough two different capacity of ROL of mangrove plants（K.obovata and A.corniculatum）by different concentrations of two kinds of polycyclicaromatic hydrocarbons (phenanthrene，pyrene)in greenhouse，which was divided intothree groups.First, in sand culture, mangrove plant seedlings were treated withdifferent concentrations of PAHs (phenanthrene and pyrene);Second,,there wereno-plants in Rhizosphere bag,but timed irrigation nutrient solution containing theplant root exudates(The mangrove plants water culture Parallelly, and collect thesenutrient solution containing root exudates),treated three months. The third treatmentgroup is the first two treatment continued for a month separately. After theexperiments, determinating the ROL of the mangrove plants and polycyclic aromatichydrocarbons in soil, then,qualitatively analysis the relationship of ROLand Removalefficiency PAHs. Experiment3, in the processing of different light intensities,wechoosed two different capacity of ROL mangrove plants(K. candel,A.corniculatum),which divided into three groups(10h；8h；6h). Finally, With thenon-species-specific correlation analysis，we would draw a conclusion that the role ofROL of mangrove plant to the Removal efficiency of PAHs，in light indirectregulatory role. This study, by quantitative analysis of three experiments，Initiallyproved the relationship between ROL and removal efficiency of PAHs. The mainresults as follows:(1) Through experiment one, with the non-species-specific correlation analysis,the four kinds of mangrove plants(B.gymnorrhiza, K.obovata, A.ilicifolius,A.corniculatum) treated with two kinds of polycyclic aromatic hydrocarbonsphenanthrene (phenanthrene, pyrene) in different concentrations, then statistics on thebiomass of mangrove plant,what,s more,. The results show that mangrove plantgrowth status was significantly negatively correlated with the treatment of polycyclicaromatic hydrocarbons concentration（y=93.86-0.471x，R2=0.876，P＜0.0001）. (2) The stress role of polycyclic aromatic hydrocarbons toROL was significantlynegatively,which was meaning the higher the concentration of polycyclic aromatichydrocarbons the smaller the ROL. With the non-species-specific correlation analysisabout the four species of mangrove plant seedings(B.gymnorrhiza, K.obovata,A.ilicifolius, A.corniculatum),we obtained that the ROL and patience of theindex showed a significant positive correlation.(3) By the experiment of the light groups, studies have shown that the twospecies of mangrove plant seedings K.obovata, A.corniculatum have the differentROL Under different light intensity.what,s more, in normal sunlight,the strongerillumination the more ROL,which was meaning that ROL and illumination Showed asignificant positive correlation(4) Studies have shown that，by experiment one，the ROL of four species ofmangrove plant seedings showed a significant positive correlation with the removalefficiency of PAHs,under different treatments.(5) Throughing the regulation of ROL of experiment second and third,wesummed up he ROL of four species of mangrove plant seedings showed a significantpositive correlation with the removal efficiency of PAHs,under different regulationtreatments.Numerous studies show that the degradation of PAHs is mainly biodegradable,and the main research topics include many respects, such as the separation ofmangrove degradation fungi which can degradate PAHs, absorption and degradationof plant,and plant-microorganism combined bioremediation degradation. However,the innovation of this study is through direct and indirect control experiments toquantitatively explore the relationship between ROL and removal efficiency of PAHs. |
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