Journal ArticleDOI
Nitrogen mineralization: challenges of a changing paradigm
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TLDR
A complete new conceptual model of the soil N cycle needs to incorporate recent research on plant–microbe competition and microsite processes to explain the dynamics of N across the wide range of N availability found in terrestrial ecosystems.Abstract:
Until recently, the common view of the terrestrial nitrogen cycle had been driven by two core assumptions—plants use only inorganic N and they compete poorly against soil microbes for N. Thus, plants were thought to use N that microbes “left over,” allowing the N cycle to be divided cleanly into two pieces—the microbial decomposition side and the plant uptake and use side. These were linked by the process of net mineralization. Over the last decade, research has changed these views. N cycling is now seen as being driven by the depolymerization of N-containing polymers by microbial (including mycorrhizal) extracellular enzymes. This releases organic N-containing monomers that may be used by either plants or microbes. However, a complete new conceptual model of the soil N cycle needs to incorporate recent research on plant–microbe competition and microsite processes to explain the dynamics of N across the wide range of N availability found in terrestrial ecosystems. We discuss the evolution of thinking abou...read more
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Journal ArticleDOI
Soil moisture variations affect short-term plant-microbial competition for ammonium, glycine, and glutamate
TL;DR: The results demonstrate the flexibility in plant-microbial use of different N sources in response to soil moisture fluctuations and emphasize the importance of including transient soil conditions in experiments on resource competition between plants and soil microorganisms.
Journal ArticleDOI
Limited effects of early snowmelt on plants, decomposers, and soil nutrients in Arctic tundra soils.
Anthony Darrouzet-Nardi,Anthony Darrouzet-Nardi,Heidi Steltzer,Patrick F. Sullivan,A. D. Segal,Amanda M. Koltz,Carolyn Livensperger,Joshua P. Schimel,Michael N. Weintraub +8 more
TL;DR: It is concluded that the interaction of snowmelt timing with soil temperatures is important to how the ecosystem will respond, but that 1‐ to 2‐week changes in timing ofSnowmelt alone are not enough to drive season‐long changes in soil microbial and nutrient cycling processes.
Journal ArticleDOI
Grazing decreases N partitioning among coexisting plant species
TL;DR: This study investigated the long-term effects of herbivores on plant and microbial community composition and nutrient cycling in Yellowstone National Park over a 50-year period.
Journal ArticleDOI
Influence of rewetting on microbial communities involved in nitrification and denitrification in a grassland soil after a prolonged drought period
Verena Hammerl,Eva-Maria Kastl,Michael Schloter,Susanne Kublik,Holger Schmidt,Gerhard Welzl,Anke Jentsch,Carl Beierkuhnlein,Silvia Gschwendtner +8 more
TL;DR: High seasonal dependency of microbial community responses to extreme events showed a strong influence of plant-derived factors like vegetation stage and plant community composition and consequently close plant-microbe interactions and remarkable resistance and/or resilience of functional microbial groups involved in nitrogen cycling to extreme weather events what might indicate that microbes in a silty soil are better adapted to stress situations as expected.
Journal ArticleDOI
Nitrogen Mineralization in Soils Related to Initial Extractable Organic Nitrogen: Effect of Temperature and Time
TL;DR: In this paper, the influence of temperature and time on extractable organic nitrogen (EON) levels, which is a measure of DON, and their relationship with N mineralization was studied.
References
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