Links between carbon and nitrogen cycling processes in forest soils: An innovative approach with both NMR and stable isotope techniques

了解森林生态系统中土壤碳和氮循环过程之间的关键联系，对于发展有效的立地管理以提高森林生产力和环境效益是必要的。在首次将~(14)N-核磁共振技术应用于土壤腐植酸(HA)的研究中，我们发现土壤中存在着令人惊讶的硝态氮，其中HA-硝态氮对森林经营实践极为敏感。该项目是首次尝试综合使用先进的核磁共振和稳定同位素技术来研究澳大利亚和美国森林生态系统中碳和氮循环过程之间的化学和生物联系。

Understanding the critical links between soil carbon and nitrogen cycling processes in forest ecosystems is necessary for developing effective site management to enhance forest productivity and environmental benefits. In the first application of 14N-nuclear magnetic resonance (NMR) to soil humic acid (HA), we have discovered that surprisingly nitrate-N is present in soil HAs, with the HA-nitrate N extremely sensitive to forest management practices. This project represents the first attempt to integrate the use of advanced NMR and stable isotope techniques to examine both chemical and biological linkages between carbon and nitrogen cycling processes in Australian and US forest ecosystems.