A review of stable isotope techniques for N2O source partitioning in soils:: recent progress, remaining challenges and future considerations
A review of stable isotope techniques for N2O source partitioning in soils:: recent progress, remaining challenges and future considerations
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DOI：
10.1002/rcm.3456
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发表时间：
2008-06-01
影响因子：
2
通讯作者：
Baggs, E. M.
中科院分区：
文献类型：
--
作者：
Baggs, E. M.
一氧化二氮在土壤中是通过几个过程产生的，这些过程可能同时发生在同一土壤的不同微点内。稳定同位素技术通过同位素比质谱测定N2O的N-15和O-18特征来估计（自然丰度、地点偏好）或定量（富集）过程，在N2O排放归属于不同微生物过程中发挥着至关重要的作用。当与次级同位素质谱分析、微生物生态学和建模方法的最新发展相结合时，这些方法有可能变得更加强大，使N2O的来源能够在更大的尺度上被考虑，并与潜在的微生物学相关。这种一氧化二氮的来源划分本身就具有挑战性，但对于完成一氧化二氮的预算和更好地了解对不同过程的控制至关重要，以期制定适当的管理做法以减少一氧化二氮。在这方面，至关重要的是，在任何旨在查明来源归属的研究中，都应尽可能多地考虑到产生影响的进程，因为针对一种进程的缓解战略可能不适用于另一种进程。为了帮助实现这种方法，本文对当前的技术状况进行了严格的审查，突出了仍然存在的挑战，并为未来的方向提出了建议。版权所有(C) 2008约翰威利父子有限公司
Nitrous oxide is produced in soil during several processes, which may occur simultaneously within different micro-sites of the same soil. Stable isotope techniques have a crucial role to play in the attribution of N2O emissions to different microbial processes, through estimation (natural abundance, site preference) or quantification (enrichment) of processes based on the N-15 and O-18 signatures of N2O determined by isotope ratio mass spectrometry. These approaches have the potential to become even more powerful when linked with recent developments in secondary isotope mass spectrometry, with microbial ecology, and with modelling approaches, enabling sources of N2O to be considered at a wide range of scales and related to the underlying microbiology. Such source partitioning of N2O is inherently challenging, but is vital to close the N2O budget and to better understand controls on the different processes, with a view to developing appropriate management practices for mitigation of N2O. In this respect, it is essential that as many of the contributing processes as possible are considered in any study aimed at source attribution, as mitigation strategies for one process may not be appropriate for another. To aid such an approach, here the current state of the art is critically examined, remaining challenges are highlighted, and recommendations are made for future direction. Copyright (C) 2008 John Wiley & Sons, Ltd.