the soil n cycle: new insights and key challenges
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Abstract
1. quantifying the importance of nitrifier denitrification and its main controlling factors;
2. characterizing the greenhouse gas mitigation potential and microbiological basis for N2O consumption;
3. characterizing hotspots and hot moments of denitrification
Furthermore, we identified a key challenge with respect to modelling:
1. disentangling gross N transformation rates using advanced 15N / 18O tracing models
Finally, we propose four key challenges related to how ecological interactions control N cycling processes:
1. linking functional diversity of soil fauna to N cycling processes beyond mineralization;
2. determining the functional relationship between root traits and soil N cycling;
3. characterizing the control that different types of mycorrhizal symbioses exert on N cycling;
4. quantifying the contribution of non-symbiotic pathways to total N fixation fluxes in natural systems
We postulate that addressing these challenges will constitute a comprehensive research agenda with respect to the N cycle for the next decade. Such an agenda would help us to meet future challenges on food and energy security, biodiversity conservation, water and air quality, and climate stability.
1. quantifier l'importance de la dénitrification par les nitrifiants et ses principaux facteurs de contrôle ;
2. caractériser le potentiel d'atténuation des gaz à effet de serre et les bases microbiologiques de la consommation de N2O ;
3. caractériser les points chauds et les moments chauds de la dénitrification
De plus, nous avons identifié un défi majeur concernant la modélisation :
1. élucider les taux bruts de transformation de N à l'aide de modèles avancés de traçage 15N / 18O
Enfin, nous proposons quatre défis clés relatifs à la manière dont les interactions écologiques contrôlent les processus du cycle de N :
1. relier la diversité fonctionnelle de la faune du sol aux processus du cycle de N au-delà de la minéralisation ;
2. déterminer la relation fonctionnelle entre les traits racinaires et le cycle de N dans le sol ;
3. caractériser le contrôle exercé par les différents types de symbioses mycorhiziennes sur le cycle de N ;
4. quantifier la contribution des voies non symbiotiques aux flux totaux de fixation de N dans les systèmes naturels
Nous postulons que relever ces défis constituera un programme de recherche exhaustif sur le cycle de N pour la prochaine décennie. Un tel programme contribuera à faire face aux défis futurs concernant la sécurité alimentaire et énergétique, la préservation de la biodiversité, la qualité de l'eau et de l'air, ainsi que la stabilité climatique.
| Reference Key |
groenigen2015soilthe
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| Journal | energy and environment |
| Year | 2015 |
| DOI |
10.5194/soil-1-235-2015
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