EAPSI:Effect of Humic Substances on Ammonium Oxidation Coupled to Iron Reduction in Paddy Soils

EAPSI：腐殖质对稻田土壤铵氧化与铁还原的影响

• 批准号: 1515326
• 负责人: Olivia Healy
• 金额: $ 0.51万
• 依托单位: Healy Olivia
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-06-01 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1515326&HistoricalAwards=false
• 关键词: EAPSI; Effect; Humic; Substances; Ammonium

Humic substances could have a significant impact on iron cycling in paddy soils, resulting in impacts on nitrogen loss and retention in terrestrial ecosystems. This project will determine the effect of humic substances on the process of iron reduction coupled to ammonium oxidation and subsequent nitrogen loss in paddy soils. The abundance of humic substances in soils indicates the significant potential impact of humic substances on iron cycling and on nitrogen loss from paddy soils in China, where one-third of the world?s synthesized nitrogen fertilizer is produced. To determine the impact of humic substances on iron and nitrogen cycling in paddy soils, humic substance, iron, and nitrogen cycling will be stimulated in paddy soils and nitrogen loss will be measured. In addition, the stimulated microbial community will be analyzed to improve the understanding of the microorganisms responsible for nitrogen loss and retention and iron cycling in terrestrial ecosystems. This project will be completed in collaboration with Dr. Yong-Guan Zhu at the Institute for Urban Environment, Chinese Academy of Sciences. Dr. Zhu has extensive experience analyzing paddy soil iron and nitrogen cycling and microbial communities. The stimulated microbial community will be analyzed by stimulating iron reduction coupled to ammonium oxidation in paddy soils and employing culture-independent (sequencing-by-synthesis of 16S rRNA gene sequences) and culture-dependent (soil enrichment followed by colony isolation) microbial community analysis of the paddy soils. The proposed research will improve the mechanistic understanding of terrestrial nitrogen and iron cycling and estimations of global nitrogen loss. This NSF EAPSI award supports the research of a U.S. graduate student and is funded in collaboration with the Chinese Ministry of Science and Technology.

腐殖质可能会对稻田中的铁循环产生重大影响，从而影响氮损失和陆地生态系统的保留率。该项目将确定腐殖质对谷物氧化偶联的铁还原过程的影响以及随后在稻田中的氮损失。土壤中的腐殖质丰度表明，腐殖质物质对铁循环以及中国稻田损失的氮损失的显着潜在影响，那里产生了世界三分之一的合成氮肥。为了确定腐殖质对稻田中铁和氮循环的影响，将在稻田中刺激腐殖质，铁和氮循环的影响，并将刺激氮的损失。此外，将分析受刺激的微生物群落，以提高对负责氮损失和保留率的微生物的理解，以及陆地生态系统中的铁循环。该项目将与中国科学院城市环境研究所的Yong-guan Zhu博士合作完成。朱博士在分析稻田土铁和氮循环和微生物群落方面具有丰富的经验。将通过刺激稻田土壤中的铁还原与铵氧化并采用培养物依赖性（16S rRNA基因序列的测序）和培养依赖性（富含菌落的土壤隔离之后）的微生物社区分析的微生物社区分析，从而分析了刺激的微生物群落。拟议的研究将提高对陆氮和铁循环的机械理解，以及对全球氮损失的估计。该NSF EAPSI奖支持美国研究生的研究，并与中国科学技术部合作。