Distribution In Four Greening Plants And Ecophysiological Effect Of PAHs On Four Greening Plants

Polycyclic aromatic hydrocarbons (PAHs) by two or more benzene ring joined together and are widespread in the environment of organic pollutants, they are difficult to degradation in the environment, To human health and ecological environment have great potential harm. PAHs pollution of the environment for the conduct of repair, has increasingly become a focus of study at home and abroad. Bacause of low-cost, small destructive, phytoremediation technology show its unique advantages and cause for great concern. Koelreuteria Paniculaat, Cinnamomum camphora, Liriodendron chinese Sarg, Magnolia grandiflora which were common in southern China's urban greening and forest tree species have been selected as research object in indoor potted plants control experiment. By measuring growth characteristics, photosynthetic characteristics and PAHs in the temporal and spatial distribution in plant under different concentrations of PAHs pollution, the response and tolerence of Plant Physiology and Ecology plant to the PAHs have been known, the conclution urban provide a scientific basis for urban forest construction and repair of the PAHs in the future.(1) The content of PAHs in root, stem and leaf of each species grown in pollution treatment are respectively higher than control group. The content of PAHs in roots and stem of each species have shown the increace trend increases with concentration of pollution. It have shown that the content of PAHs in leaf of Cinnamomum camphora, Liriodendron chinense, Magnolia grandiflora in medium concentration of pollution are less than in the low and high concentrations, The PAHs in Koelreuteria Paniculaat was increased with gradient increased pollution.(2) Under pollution treatment, The total PAHs content in four kind of plants are respectively higher than control group, PAHs in Koelreuteria Paniculaat and Liriodendron chinense are increasing with the increace of pollution, The PAHs content in Cinnamomum camphora and Magnolia grandiflora have shown that which in low and high concentration of pollution are higher than in medium concentration. Under high concentrations of PAHs in each species followed the order Koelreuteria Paniculaat, Cinnamomum camphora, Liriodendron chinense, Magnolia grandiflora.(3) The distribution of PAHs in each organs of Koelreuteria Paniculaat and Liriodendron chinense are similar:The proportion of PAHs in leaf has reduced with increased of pollution but increased in root. The proportion of PAHs in plant stem of each treatments have little difference. The proportion of PAHs in root of Cinnamomum camphora in the different treatment group were similar. The proportion of the content of PAHs in the control group are the largest. Kwong Yu-lan control group of plant roots and stem the high levels of PAHs. The proportion of PAHs in roots and leaves have a negative correlation.(4) The PAHs content in root and stem of Four kinds of plant and leaf of Cinnamomum camphora and Liriodendron chinense of PAHs showed a similar time trend, PAHs content in the first quarter has a sharp drop, and to the rock bottom of the second quarter, little fluctuate since then, while the PAHs in plants of control Group in four quarter has little ups and downs. The time trend of PAHs content in Koelreuteria paniculata, Magnolia grandiflora leaves are different in their root and stem o, The content of PAHs in Koelreuteria paniculata leaf has a continual drop in four quarter and The PAHs content of Liriodendron chinense in low and high pollution has been increasing in the fourth quarter.(5) The high growth order of Koelreuteria paniculata is T1> T2> T3> To, T1,T2,T3 are respectively 109.69%,31.05% and 12.71% higher than the control, there was significant difference between T1 group and T0 group. The order of growth in diameter is T0>T1>T2>T3, T1,T2,T3 are respectively 83.69%,53.25%,19.35% higher than control group.(6) Liriodendron chinense the high growth of T2> T1> T0> T3, the team was not significantly different. Liriodendron chinense to stem Growth of the overall situation for T2> T1> T3> T0, respectively, higher than the 96.34 percent,49.21 percent,4.71 percent, the pollution between the group and control group was not significant.(7) The order of high-growth of Cinnamomum camphora is T3> T2> T1> T0, T3 have significant difference with T0. The order of growth in diameter is T2> T0> T3> T1.(8) Magnolia's high-growth order is T2> T1> T3> T0, there was a signif-icant difference between T2 and To, but no significant difference between each pollution group. The order of growth in diameter is T2> T0> T3> T1.(9) The daily variation on the curve of Pn and Cond of Koelreuteria Paniculaat, Cinnamomum camphora and Liriodendron Chinese Sarg showed a single peak curve, while the control group plants for the bimodal curve, The mechanisms for the midday depression has been changed by pollution. The The daily variation Pn of Magnolia in control and treatment group are both bimodal curve, but its peaks are at different time under pollution.(10) The daily average Pn of Koelreuteria Paniculaat, Cinnamomum camphora, Liriodendron chinese Sarg, Magnolia grandiflora in pollutin group are higher (except for dealing with camphor tree T3) than in control guoup. The Pn of Liriodendron chinense is increasing with the increasing concentration of pollution and the Pn of other species are higher in low, medium pollution than under high pollution.(11) The daily average Cond of Koelreuteria Paniculaat and Liriodendron chinense treated with PAHs pollution is greater than control group, Liriodendron chinense Cond value increased with the increased concentration; The Cond of Cinnamomum camphora and Magnolia grandiflora are largest in medium concentration and greater than that of control group, The Cond of high concentrations of pollution is minimum and less than the control group.(12) The light saturation point(LSP) of Koelreuteria Paniculaat with pollution treatment has a significantly increase; The LSP of Cinnamomum camphora in the medium concentration of pollution is the largest and its photosynthesis also strong. The photosynthesis of plant lived in low and high concentrition pollution was inhibited; The Pn of Liriodendron chinense are promoted by PAHs pollution; The LSP of Magnolia grandiflora in each treatment are the same basically, The Pn of Magnolia grandiflora treated with medium and low concentrations of pollution are promoted, and the high concentration of pollution have inhibited Role.