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

芦苇根际微好氧环境除氮机理研究。

• 批准号: 11680582
• 负责人: HARADA Masamitsu
• 金额: $ 0.7万
• 依托单位: Fukushima National College of Technology.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11680582/
• 关键词: Emerging plants; Reed; Rhizosphere; Microaerobic environment; Nitrification; Denitrification; Oxidation-reduction potential

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.

在芦苇根附近，由于来自地上的氧气供应通过植物体进行，因此形成微好氧环境，在那里通过硝化和反硝化进行氮转化似乎是可能的，并且它作为公共沃茨的水质保护技术之一而受到关注。本研究以建立芦苇种植有效去除沃茨营养盐的技术为目的，探讨了芦苇根际微观环境中氮素转化的机理。在芦苇根际进行了地上供氧，土壤氧化还原电位（ORP）为0 ~ 1100 mV，与未种植芦苇的土壤中-1700 mV ~ 300 mV相比，微氧环境逐渐形成。可以看出，溶解氧的供给和消耗在白天和夜间都很好，可以确认，在芦苇种植土壤中，除了植物体吸收氨氮外，由于向土壤中供氧而引起的硝化和反硝化作用，氮的减少也显著发生，而在没有种植的土壤中，氨氮积累。结果表明，地上部光照条件引起的根际好氧和厌氧条件的微妙差异，影响了根际养分的吸收和硝化反硝化特性。