The Research On Diesel Oil Removal By Kandelia Candle And Aegiceras Corniculatum

Mangroves are tidal flat wetland woody plant communities which grow in tropical and subtropical coastal intertidal zone and are composed of evergreen shrubs or aiphyllium that mangrove plants as the main part. Its survival environment is influenced by periodic tide inundated. With the development of industries in coastal areas, diesel pollution becomes increasingly serious. The research on diesel oil removal by mangrove plants is a hot spot.This study Took kandelia candle and Aegiceras corniculatum for example,explored the relationships between nitrogen, phosphorus, sediments and both the tolerance to diesel pollution and the removal rates of diesel oil of two mangrove seedlings, compared the tolerance to diesel pollution of K. candle and the effect of diesel oil removal by K. candle with A. corniculatum. by four indoor potted experiment.The first sand-cultured experiment has been carried out for 4 months to investigate the effects of nitrogen nutrient on diesel oil removal by two mangrove seedlings, K.candle and A. corniculatum, and their growth. The results showed that the increase of nitrogen nutrient could promote the increase in the height of the stem, the biomass accumulation of roots, stems and leaf and the tolerance to diesel pollution of two mangrove seedlings. The removal rates of diesel oil in rhizosphere sands of both two mangrove seedlings might be significantly promoted, even over 90%. Moreover, in the same treatment, the increase of nitrogen nutrient could also promote the removal efficiency of diesel oil in rhizosphere areas of two mangrove seedlings. This research will provide a scientific basis about the selection of nitrogen nutrition condition to construct the mangrove wetlands that be used to repair the diesel oil pollution.The second sand-cultured experiment has been carried out for 4 months to investigate the effects of phosphorus nutrient on diesel oil removal by two mangrove seedlings, K. candle and A. corniculatum, and their growth. The results showed that the increase of phosphorus nutrient could not promote the increase in the height of the stem, the biomass accumulation of roots, stems and the tolerance to diesel pollution oftwo mangrove seedlings. The removal rates of diesel oil in rhizosphere sands of both two mangrove seedlings might be significantly promoted, even over 91%. Moreover,in the same treatment, the increase of phosphorus nutrient could also promote the removal efficiency of diesel oil in rhizosphere areas of two mangrove seedlings. This research will provide a scientific basis about the selection of phosphorus nutrition condition to construct the mangrove wetlands that be used to repair the diesel oil pollution.The third experiment has been carried out for 3 months to investigate the effects of substrata on diesel oil removal by two mangrove seedlings, K. candle and A.corniculatum, and their growth. The results showed that the increase of sludge in substrata could promote the increase in the height of the stem, the biomass accumulation of roots, stems and leaf and the tolerance to diesel pollution of two mangrove seedlings. The growth index and biology quantity reached the maximum value when the content of sludge in substrata was 100% or 75%. Moreover, in the same treatment, the increase of sludge in substrata could also promote the removal efficiency of diesel oil in rhizosphere areas of K. candle and A. Corniculatum. It reached a maximum when the content of sludge in substrata was 75% or 50%, and then dropped down. This research will provide a scientific basis about the selection of substrata to construct the mangrove wetlands that be used to repair the diesel oil pollution.The fourth sand-cultured experiment has been carried out for 4 months to compare the removal efficiency of diesel oil in rhizosphere areas of K. candle and A.corniculatum, and their growth. The results showed that the growth of both K. candle and A. corniculatum was significantly inhibited by diesel oil, the higher concentration of diesel oil, the inhibition more obvious. The tolerance to diesel pollution of A.corniculatum was greater than K. candle. Although the removal rates of diesel oil in non-rhizosphere sands ranged from 76% to 79%, those in rhizosphere sands of both two mangrove seedlings might be significantly promoted, even over 92%. Moreover,in the same treatment, the removal efficiency of diesel oil in rhizosphere areas of K.candle was greater than A. corniculatum. This research will provide a scientific basis about the selection of species to construct the mangrove wetlands that be used to repair the diesel oil pollution.