Work

A review of stable isotope techniques for N 2 O source partitioning in soils: recent progress, remaining challenges and future considerations

Year: 2008

Type: review

Abstract: 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 N(2)O emissions to different microbial processes, through estimation (natural abundance, site preference) or quantification (enrichment) of processes based on the (15)N and (18)O signatures of N(2)O 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 N(2)O to be considered at a wide range of scales and related to the underlying microbiology. Such source partitioning of N(2)O is inherently challenging, but is vital to close the N(2)O budget and to better understand controls on the different processes, with a view to developing appropriate management practices for mitigation of N(2)O. 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.

Source: Rapid Communications in Mass Spectrometry

DOI: 10.1002/rcm.3456

Author: E. M. Baggs

Institution: University of Aberdeen

Language: English

Topic: Soil Carbon and Nitrogen Dynamics

Subfield: Soil Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

Open Access status: bronze

Funders: Biotechnology and Biological Sciences Research Council, Natural Environment Research Council

Awards: G1209083936, Multicollector isotope ratio mass spectrometry: New frontiers in soil microbiology and biogeochemistry, G2569989047, G6306143526, Is it root- or soil-derived carbon that drives denitrification?