Reserving nitrogen in soils through microbial nitrate reduction to ammonium

通过微生物将硝酸盐还原为铵来保留土壤中的氮

• 批准号: DP160101028
• 负责人: Prof Jizheng He
• 金额: $ 17.37万
• 依托单位: The University of Melbourne
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2016
• 资助国家: 澳大利亚
• 起止时间: 2016-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP160101028
• 关键词: Reserving; nitrogen; soils; through; microbial

This project aims to identify those microbes able to transform nitrate to ammonium and thus increase soil nitrogen conservation. More than 50 per cent of the nitrogen in fertilisers applied to soils is lost into the environment, which is both a financial loss to farmers and a main anthropogenic source of nitrogen pollution. Some microbes can transform nitrate into ammonium through dissimilatory reduction (DNRA) and thus increase soil nitrogen retention. However, the DNRA process and the responsible microbial groups remain largely unknown. This project plans to use isotope tracing and biomolecular approaches to identify those DNRA microbial groups and elucidate the DNRA reaction process. The findings may support the use of DNRA to improve soil nitrogen.

该项目旨在确定那些能够将硝酸盐转化为铵的微生物，从而增加土壤氮的保存。施用于土壤的肥料中50%以上的氮流失到环境中，这既是农民的经济损失，也是人为氮污染的主要来源。一些微生物可以通过异化还原（DNRA）将硝态氮转化为铵态氮，从而增加土壤氮潴留。然而，DNRA过程和负责的微生物群在很大程度上仍然未知。本项目计划利用同位素示踪和生物分子方法鉴定这些DNRA微生物群，并阐明DNRA反应过程。这些发现可能支持使用DNRA来改善土壤氮。