Removal of nitrogen and phosphate by the circulation of percolated water and paddy rice growth

渗滤水循环脱氮除磷与水稻生长

• 批准号: 06660306
• 负责人: OHTSUBO Masami
• 金额: $ 1.28万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06660306/
• 关键词: Paddy field; Reduction of nitrogen; Rice paddy growth; Percolation water; Circulation; 窒素の除去; 循環

Purification capability of nitrogen for paddy soil has been studied in the paddy field. In the present study, paddy rice was cultivated in pot soil under the percolation of water with and without circulation, and the concentration of nitrogen in the soil solution has been measured for three months. The same experiments were conducted for the pot soil without paddy rice. The concentration of NH_4-N in the pot soil without paddy rice showed about 2.5mg/L irrespective of time under both circulated and uncirculated water percolation. This could be attributed to the continuous dissolution of ammonium adsorbed on the clay surface. The concentration of NH_4-N in the pot soil with paddy rice became zero after twenty days since the percolation started. This tendency was the same irrespective of the percolation rate. The reduction rate of ammonium in the pot soil was 93 to 99% for the soil with paddy rice, and 73 to 94% for the soil without paddy rice. The crop of rice showed a little difference between the pot soil with and without water circulation, and due to the difference of percolation rate. Thus, the paddy soil exhibited high ammonium removal capability and this capability entirely depended on the adsorption by soils and the absorption by paddy rice.

在田间条件下研究了水稻土对氮素的净化能力。在盆栽条件下，对水稻进行了三个月的水循环和不循环渗滤培养，并测定了土壤溶液中氮的浓度。对不加水稻的盆栽土壤进行了同样的试验。不加水稻的盆栽土壤在循环水和非循环水渗滤下，NH_4-N浓度随时间变化均在2.5mg/L左右。这可能是由于吸附在粘土表面的铵不断溶解。水稻盆栽土壤中NH_4-N浓度在渗滤开始后20天内为零。这种趋势是相同的，无论渗滤速率。盆栽土壤中铵态氮的去除率，有水稻土为93 ~ 99%，无水稻土为73 ~ 94%。水稻产量在有水循环和无水循环的盆栽土壤中表现出一定的差异，这主要是由于土壤渗透率的不同所致。因此，水稻土具有很强的除铵能力，这种能力完全取决于土壤的吸附和水稻的吸收。

项目成果

Ohtsubo, M.: "Oxidation of pyrite in marine clays and zinc adsorption by calys" ASTM STP 1293 (Philadelphia). 50-57 (1995)

Ohtsubo, M.：“海洋粘土中黄铁矿的氧化和花萼对锌的吸附”ASTM STP 1293（费城）。

Ohtsubo, M.: "Oxidation of pyrite in marine clays and zinc adsorption by clays" ASTM STP 1293 (Philadelphia). 50-57 (1995)

Ohtsubo, M.：“海洋粘土中黄铁矿的氧化和粘土对锌的吸附”ASTM STP 1293（费城）。

OHTSUBO M.: "Oxidation of pyrite in marine clays and zinc adsorption by clays, Dredging, Remediation, and Containment of Contaminated sediments" ASTM STP 1293, K.R.Demers et al. Eds., American Society for Testing and Materials. 50-57 (1995)

OHTSUBO M.：“海洋粘土中黄铁矿的氧化和粘土对锌的吸附、污染沉积物的疏浚、修复和遏制”ASTM STP 1293，K.R.Demers 等人。