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.

腐殖物质对水稻土铁循环具有重要影响，进而影响陆地生态系统氮素的流失和固持。该项目将确定腐殖物质对水稻土中铁还原过程的影响，以及随后的铵氧化和氮损失。土壤中丰富的腐殖物质表明腐殖物质对中国水稻土铁循环和氮素损失的潜在影响，而中国水稻土占世界的三分之一。合成氮肥。为了确定腐殖物质对水稻土中铁和氮循环的影响，将在水稻土中刺激腐殖物质、铁和氮循环并测量氮损失。此外，还将对刺激的微生物群落进行分析，以提高对陆地生态系统中氮损失和保留以及铁循环的微生物的了解。该项目将与中国科学院城市环境研究所的朱永冠博士合作完成。朱博士在分析水稻土铁氮循环和微生物群落方面拥有丰富的经验。将通过刺激水稻土中的铁还原与铵氧化偶联，并采用水稻土的非培养性（16S rRNA基因序列合成测序）和培养依赖性（土壤富集，然后进行菌落分离）微生物群落分析，对刺激的微生物群落进行分析。拟议的研究将提高陆地氮和铁循环的机制理解和全球氮损失的估计。该NSF EAPSI奖支持美国研究生的研究，并与中国科技部合作资助。