Understanding plant uptake of organic and inorganic nitrogen for optimal fertiliser application in forestry

了解植物对有机和无机氮的吸收，以优化林业施肥

• 批准号: LP0989129
• 负责人: A/Prof Charles Warren
• 金额: $ 12.03万
• 依托单位: The University of Sydney
• 依托单位国家: 澳大利亚
• 项目类别: Linkage Projects
• 财政年份: 2009
• 资助国家: 澳大利亚
• 起止时间: 2009-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/LP0989129
• 关键词: Understanding; plant; uptake; organic; inorganic

Nitrogen (N) in soils occurs in both organic and inorganic forms. Plants can take up inorganic N - nitrate and ammonium - but, on average, these account for only 5% of the soluble N in soils. Recent evidence suggests that plants may be able to tap into some of the 95% of N that occurs in organic forms. We will investigate the importance of organic N uptake for two plantation Eucalyptus species by tracing the uptake of different N forms by bacteria, fungi and eucalypts. This information will redefine what is meant by 'available N' and will guide the development of a new test for soil N status.

土壤中的氮既有有机形态，也有无机形态。植物可以吸收无机N-硝酸盐和铵--但平均而言，它们只占土壤中可溶氮的5%。最近的证据表明，植物可能能够利用有机形式存在的95%的氮。我们将通过跟踪细菌、真菌和桉树对不同形态氮的吸收来研究有机氮吸收在两种桉树人工林中的重要性。这些信息将重新定义“有效氮”的含义，并将指导开发一种新的土壤氮素状况测试方法。