反硝化的

The results of culture experiment show that the volume of the gas produced by ammonification in the vagetated water is about 2 times as much as that in the unvegetated open water.

各种水生高等植物群落内氮循环细菌分布及微环境的差异，促进了有机氮的分解、铵态氮的硝化和挥发、硝酸盐氮的反硝化作用。

The technology of biological nitrogen removal by nitrosification denitrification, which has been developing a few years, is the combination between the oxidation of ammonia and the deoxidation of nitrite.

亚硝酸型硝化反硝化生物脱氮技术是近年来发展起来的新型的生物脱氮技术，其实质是氨的氧化与亚硝氮的还原相偶联。

In this paper,the research history and status were summarized.The processes of soil nitrogen input,interior transformation and output,including litter return,fertilization,atmosphere desposition,ammonification nitrogen fixation,ammonification,nitrification,denitrification,plant uptake,NH 3 volatilization and NO 3- leaching,were introduced.Finally,the tendency of study on soil nitrogen...

本文综述了森林土壤氮素转化与循环的研究历程和现状；介绍了凋落物的归还、施肥、大气沉降、自生固氮、氨化、硝化、反硝化、植物吸收、NH3 的挥发、NO3 -淋溶等土壤氮素输入、转化和输出的途径和过程；最后从研究目标、研究方法、研究对象和研究内容 4个方面归纳了森林土壤氮素转化与循环的发展趋势。

Therefore, nitrification and denitrification has attracted more attention, whether from an agricultural point of view, or from an environmental point of view.

因此，无论是从农业的观点，还是从环境的角度看，硝化反硝化作用已引起人们越来越多的关注。

With retention time prolonged, the concentrations of TN, NH4(superscript +)-N and TP of domestic sewage were obviously reduced in all floating-bed systems, however the NO4(superscript +)-N concentrations were gradualjy accumulated due to the stronger nitrification than denitrification. The plants in floating-bed system increased significantly the N2O flux, which was 174.44μg/(m^2h), 82.19μg/(m^2h), 112. 49μg/(m^2h) and 44.81μg/(m^2h), respectively, for the Lolium mutliflorum, Oenanthe javanica, Vetiveria Zizanioides arid none-plant floating-bed systems.

净化周期内，浮床各系统的TN、NH4-N和TP浓度随着污水停留时间的延长直线下降，而NO3-N浓度却因系统内硝化强度大于反硝化强度而产生了累积；植物的存在明显的促进了浮床系统的N2O排放，浮床黑麦草、水芹、香根草和对照系统N2O的平均排放通量分别为174.44μg/， 82.19μg/， 112.49μg/和44.81μg。

Most removal of chemical and microbiological constituents occurs in the top 2 m of the vadose zone, biological breakdown of organics, nitrification, and denitrification occur in the unsaturated zone and in the aquifer.

大部分的用化学和微生物去除发生在最上层两米的渗流区域。生物学的有机分解，硝化和反硝化作用则发生在未饱和区域和含水层。

Steps of the invention are that an agitator in a main reaction region is started while water enters to implement the nitrification process under the hypoxic condition. When a maximum value appears on a pH value curve and an inflection point appears on an ORP curve, the stirring is stopped. When the last stirring stage is stopped, oxygen is added in the mixture for the degradation of organic compounds and the nitrification of nitrogen compounds. When a minimum value appears on the pH value curve, the aeration is stopped. The steps are repeated till the water inletting stage is finished. And an aerobic aeration stage is taken as an ending stage of a reaction period.

本发明步骤：进水同时开启主反应区搅拌器，进行缺氧条件下的反硝化过程，当pH值曲线上出现极大值且ORP曲线上出现拐点停止搅拌；上一搅拌阶段停止后，向混合液中供氧，进行有机物的降解和含氮化合物的硝化作用，当pH值曲线上出现极小值停止曝气；重复以上步骤，直到进水阶段结束，并以好氧曝气阶段为反应期的结尾阶段。

Denitrification gradually took over methanogenesis to become the main reaction responsible for decomposition of MSW, while nitrogen gas was generated instead. Additionally, owing to long term exposure of nitrified leachate to MSW, the bacterial structure of landfill was changed.

在此过程中，反硝化逐渐代替产甲烷作用成为填埋场内垃圾降解的主要反应，产生气体以氮气为主，而非甲烷；硝化渗滤液与垃圾的长期作用也改变了填埋场的菌群结构。

An introduction is made on the application of an air supply low pressure jet aeration system in an improved oxidation ditch in the treatment of the liner board effluent with a detailed introduction and analysis on the commissioning of the operational process.

介绍了采用供气式低压射流曝气系统的改良型氧化沟用于箱纸板废水处理，并对整个调试运行过程进行了分析。改良型氧化沟采用全好氧曝气，沟中不存在缺氧区和厌氧区，抑制了传统氧化沟中的硝化与反硝化作用，降低了营养盐的投加成本，具有很强的抗冲击能力。

After two rice-wheat rotations, 11%–13% of applied labeled N remained in 0-60 cm soil (mostly in the 0-20 cm soil); leaching of labeled urea applied in rice season was little (only 0.6%–1.1% of the applied N accumulated in 20-60 cm soil), and the leaching of fertilizer N occurred in wheat season and the beginning flooding period of the next rice season; 47%–54% of applied fertilizer N was lost and ammonia emission and nitrification-denitrification were the main pathways.

水稻季施用的肥料氮向耕层以下移动很少，20—60 cm土层中累积肥料氮仅占施氮量的0.6%～1.1%，主要发生在小麦季及水稻泡田时期，肥料氮损失占施氮量的47～54%，氨挥发和硝化反硝化气态损失是主要途径。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。