An examination on Mechanism of Nirogen Removal in Microaerobic environment in of Rhizosphere of Reed.

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The microaerobic environment is formed, since oxygen supply from the above-ground is carried out through the plant body, in the vicinity of the root of the reed, where the nitrogen transformation by nitrification and denitrification seems to be possible, and it is noticed as one of the water quality conservation technology of public waters. In this study, the mechanism of nitrogen transformation in the microscopic environment of the reed rhizosphere was examined with the aim of the establishment of the technique which efficiently carried out the nutrients removal of waters by the reed planting.Oxygen supply from the above-ground was carried out in the reed rhizosphere, and oxidation-reduction potential(ORP)in the soil showed 0 〜 1100mV, and in comparison with -1700 〜 -300mV in the soil without planting of the reed, it was shown that the microaerobic environment was gradually formed. It became clear that the supply and the consumption of dissolved oxygen was excellent respectively in the daytime and at night.It was confirmed that the decrease of the nitrogen with nitrification and denitrification by oxygen supply to the soil is remarkably being generated in the reed planting soil in addition to an intake of ammonia nitrogen by the plant body, while ammonia nitrogen accumulated in the soil without planting. It was shown that the delicate difference between aerobic and anaerobic condition of the rhizosphere which the light condition of the above-ground brings about that it affected the uptake of nutrients, nitrification and denitrification characteristics of the rhizosphere.