A method for promoting nitrate reduction in soil

A nitrate and soil technology, applied in the restoration of polluted soil and other directions, can solve problems such as information affecting the nitrate reduction of soil columns, lack of potential and other problems, and achieve the effect of reducing risks and enhancing microbial nitrate reduction.

Active Publication Date: 2021-06-22
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To date, information on how electrical potential affects nitrate reduction in soil columns is still lacking

Method used

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  • A method for promoting nitrate reduction in soil
  • A method for promoting nitrate reduction in soil
  • A method for promoting nitrate reduction in soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Embodiment 1 A kind of method for removing nitrate in soil

[0065] In this study, the soil was collected in the area where nitrogen fertilizer was applied for a long time at the Luancheng Experimental Station of the Chinese Academy of Sciences (37.90°N, 114.67°E, 50m above sea level). The details of this site and the in-situ experiment have been mentioned in previous studies. . Five complete subsoil soil columns (0.4m long and 43mm in diameter) were collected at a soil depth of 3-3.4m in the test area using Geoprobe. These subsoil columns were then mixed and stored at 4°C until use. Soil clay, silt and sand content are 7.3%, 79.8% and 12.3%, respectively. Soil organic matter content, pH, nitrate and dissolved organic carbon concentrations were 1.9 g kg -1 , 7.9, 31.3mg kg -1 NO 3 - —N, 4.1 mg kg -1 .

[0066] (1) The collected subsoil cores (the subsoil cores represent the area below the roots, used to study the promotion of nitrate reduction of microorganisms ...

Embodiment 2

[0094] Embodiment 2 A method for promoting nitrate reduction in soil,

[0095] Insert the cathode electrode and the anode electrode into the soil sample respectively. The depth of the electrode inserted into the soil is 3cm, and the distance between the cathode electrode and the anode electrode in the soil is 3cm. Under the action of voltage, a potential of -0.3V is generated between the cathode and anode electrodes. It is sufficient to treat the soil under this potential condition.

Embodiment 3

[0096] Embodiment 3 A method for promoting nitrate reduction in soil,

[0097] Insert the cathode electrode and the anode electrode into the soil sample respectively. The depth of the electrode inserted into the soil is 4cm, and the distance between the cathode electrode and the anode electrode in the soil is 6cm. Under the action of voltage, a potential of -0.7V is generated between the cathode and anode electrodes. It is sufficient to treat the soil under this potential condition.

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Abstract

The invention discloses a method for promoting the reduction of nitrate in soil. The research of the invention shows that after voltage treatment, a potential gradient is generated from the cathode to the anode, which enriches the nitrate-reducing microorganisms and significantly strengthens the dissimilation and reduction of nitrate into The process of ammonium and denitrification, the end product is NH 4 + and N 2 . Under voltage treatment with N 2 O, N 2 And the nitrogen content gained in the form of ammonium is comparable to the nitrogen lost in the form of nitrate. These results confirmed that potential can enhance the nitrate reduction process in soil through denitrification as well as DNRA. The present invention proposes a targeted and environmentally friendly technique to enhance microbial nitrate reduction under the roots of crops, thereby reducing the risk of nitrate leaching.

Description

technical field [0001] The present invention relates to a method for promoting the reduction of nitrate in soil. Background technique [0002] It is generally believed that the main reasons for the leaching loss of nitrogen in soil are: first, the accumulation of mobile nitrogen in the soil, mainly nitrate nitrogen; second, the flow of water. Therefore, under the condition of sufficient water management, controlling the content of nitrate nitrogen in the soil becomes the main factor to control the leaching loss of nitrogen. At present, the main way to control soil nitrogen loss is to add nitrification inhibitors to the soil to inhibit nitrification in the soil, thereby reducing the content of nitrate nitrogen. However, nitrification inhibitors are all chemical substances, which are likely to cause secondary pollution. [0003] It is an effective way to reduce nitrate pollution in groundwater by strengthening the subsoil layer (the soil below the surface soil is collectivel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10
CPCB09C1/085B09C1/10
Inventor 秦树平丁可人袁海静张志君庞亚星刘婷周顺桂
Owner FUJIAN AGRI & FORESTRY UNIV
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