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New insights on N transformations by 15N tracing techniques

Paper i proceeding
Författare Tobias Rütting
Pascal Boeckx
Dries Huygens
Leif Klemedtsson
Christoph Müller
Publicerad i Working Papers of the Finnish Forest Research Institute
Volym 128
Sidor 216
ISBN 978-951-40-2176-3
ISSN 1795-150X
Publiceringsår 2009
Publicerad vid Institutionen för växt- och miljövetenskaper
Sidor 216
Språk en
Ämnesord N cycle; 15N; soil; review
Ämneskategorier Berggrundsgeologi och petrologi, Annan geovetenskap och miljövetenskap, Terrestrisk ekologi, Markkemi, Markbiologi

Sammanfattning

In recent years the understanding of the nitrogen (N) cycling in soil experienced great changes due to the discovery of a variety of new processes or underpinning the importance of alternative processes, including anaerobic ammonium oxidation (anammox), archaeal nitrification, fungal denitrification and co-denitrification, heterotrophic nitrification and nitrifier denitrification (Francis et al., 2007; Hayatsu et al., 2008). A widely used method to investigate N cycling are 15N tracing studies where one or more soil N pools are labelled with 15N and subsequently the concentrations and 15N enrichments are followed over a period of time. The main objective of these studies is to quantify the simultaneously occurring gross N transformations. Recent progress in 15N tracing models (Müller et al., 2007) enables us to perform more comprehensive process-specific analyses of the N cycle and investigate the ecological importance of previously ignored processes such as heterotrophic nitrification and dissimilatory nitrate reduction to ammonium (DNRA) (Rütting et al., 2008). Here we present results from several 15N labelling studies in temperate grassland and forest ecosystems from the northern and southern hemisphere. In these ecosystems DNRA is the dominant, sometimes exclusive pathway of NO3- consumption. The main advantage of DNRA over other NO3- consumption processes is that N is transferred into NH4+, another plant available N form, which is not prone to N losses. Therefore DNRA leads to conservation of mineral N in soils.

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