The study on the sustainability of nitrogen removal on paddy soil

水稻土脱氮可持续性研究

• 批准号: 14360138
• 负责人: KURODA Hisao
• 金额: $ 6.66万
• 依托单位: Ibaraki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14360138/
• 关键词: Nitrogen removal; Light condition; Organic matter; TOC; C; N; Daily change; Soil; 冬期条件; 脱窒; 有機物種類; TIC; 藻類

It is experimented for the sustainability of nitrogen removal. The soil used in the experiment is sampling from a flood controlled test field that has been non-vegetation since 1991. 1cm of soil surface layer is taken, and the soil was rested for 24 hours and surface water was removed. The 100g soil was put into a beaker, and 300cm^3 NO_3-N of different concentration(10, 20, 40mg・L^<-1>) was added to it. An illuminated incubator was used to change the temperature and light condition to adapt to nature's condition. And, a fixed light and temperature experiment is carried out. To compare the result of the experiment, dark condition samples covered aluminum foil. In light condition, algae growth is noted. Organic matter has great influence in nitrogen removal is understood. Nitrogen removal ability with the existence of light and dark condition and the difference in soil layer thickness, nitrogen removal can be expected in above 10mm soil layer. Any land with above 10mm soil layer can be targeted as nitrogen removal area. In the experiment where light is continuously irradiated, algae grow and nitrogen removal ability is 2 times more than in dark condition. The light condition of daily change experiment is that night(from 19:00 to 5:00) is 0μmol・s^<-1>・m^<-2>, early morning(from 5:00 to 7:00) and evening(from 17:00 to 19:00) is 60μmol・s^<-1>・m^<-2>, the daytime(from 7:00 to 17:00) is 250μmol・s^<-1>・m^<-2>. Temperature was set from test field value. To examine the effect of light condition, we carried out experiment that is fixed light intensity/temperature, light intensity variation (temperature fixed), temperature variation (light intensity fixed) conditions. The result showed the amount of nitrogen removal became a large value with light intensity variation. And it is even bigger than continuous irradiation. This is because when light is on at all time, oxidation condition progressed on. And the denitrification became difficult.

对其脱氮的可持续性进行了实验。实验所用土壤是从1991年以来无植被的防洪试验场取样，取土壤表层1cm，将土壤静置24小时，除去地表水。将100g土壤放入烧杯中，加入300cm^3不同浓度(10、20、40mg·L^<-1>)的NO_3-N。使用照明培养箱来改变温度和光照条件以适应自然条件。并且，进行了固定的光照和温度实验。为了比较实验结果，黑暗条件下的样品覆盖了铝箔。在光照条件下，可以观察到藻类的生长。有机物对脱氮有很大的影响是众所周知的。脱氮能力随光照和黑暗条件的存在以及土层厚度的差异而变化，在10mm以上的土层中可达到预期的脱氮效果。凡土层10mm以上的土地均可作为脱氮区。在光照持续照射的实验中，藻类大量生长，脱氮能力比黑暗条件下提高2倍。日变实验的光照条件为夜间（19:00～5:00）为0μmol·s^<-1>·m^<-2>，清晨（5:00～7:00）和傍晚（17:00～19:00）为60μmol·s^<-1>·m^<-2>，白天（7:00～7:00） 17:00）是 250μmol·s^<-1>·m^<-2>。温度根据测试场值设定。为了检验光照条件的影响，我们进行了固定光强/温度、光强变化（温度固定）、温度变化（光强固定）条件的实验。结果表明，随着光强的变化，脱氮量变大。而且比连续照射还要大。这是因为当灯一直亮着时，氧化状况就会继续进行。反硝化变得困难。

项目成果

Evaluation of Nitrogen Load Removal and the Allocation of Artificial Wetlands by a Distributed Model

分布式模型氮负荷去除和人工湿地分配评价

• 发表时间: 2005
• 期刊: Trans.of JSIDRE 235
• 作者: Kato T.;Kuroda H.;Nakasone H.
• 通讯作者: Nakasone H.

Application of Water Quality Tank Model Classified by Land Use to Nitrogen Load Reduction Plans

按土地用途分类的水质池模型在氮负荷削减计划中的应用

• 发表时间: 2003
• 期刊: Trans.JSIDRE 224
• 作者: Kudo;Akihiko;加藤 亮;KATO Tasuku;加藤 亮;KATO Tasuku
• 通讯作者: KATO Tasuku

流域水質管理に向けた物質循環評価システムの開発

流域水质管理物质循环评价系统开发

• 发表时间: 2004
• 期刊: 農業土木学会論文集 232
• 作者: 加藤亮;黒田久雄;中曽根英雄
• 通讯作者: 中曽根英雄

THE NITRATE NITROGEN POLLUTION AND THE NITROGEN REMOVAL BY PADDY FIELD IN AGRICULTURAL AREA

农区硝态氮污染及稻田脱氮作用

• 发表时间: 2005
• 期刊: Journal of Water and Environment Technology Vol.3
• 作者: 中井裕;大村道昭;市田知子;H.KURODA
• 通讯作者: H.KURODA

分布型モデルによる浄化型湿地の配置と窒素負荷量の評価

净化湿地的布置和利用分布模型评估氮负荷

• 发表时间: 2005
• 期刊: 農業土木学会論文集 235
• 作者: Ito;Fusao;加藤 亮
• 通讯作者: 加藤 亮