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
Citations
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Journal ArticleDOI
Soil minerals and humic acids alter enzyme stability: implications for ecosystem processes
TL;DR: In this paper, rates of enzyme turnover in a volcanic soil with and without added enzymes were determined, and it was shown that adding allophane had a strong positive effect on most enzyme activities.
Journal ArticleDOI
Preferences for different nitrogen forms by coexisting plant species and soil microbes.
TL;DR: The data suggest that coexisting plants can outcompete microbes for a variety of N forms, but that such plant species show similar preferences for inorganic over organic N.
Journal ArticleDOI
Nutrient limitation of soil microbial processes in tropical forests
Tessa Camenzind,Stephan Hättenschwiler,Kathleen K. Treseder,Anika Lehmann,Matthias C. Rillig +4 more
TL;DR: In this paper, the relative importance of nitrogen, phosphorus and other nutrients in limiting soil microbial biomass and process rates in tropical forests was discussed. But the authors did not consider the effect of microbial diversity on the availability of these nutrients.
Journal ArticleDOI
Effects of moisture and temperature on net soil nitrogen mineralization: A laboratory study
TL;DR: In this paper, the authors investigated the sensitivity of the rate of net nitrogen mineralization to temperature and/or moisture content, and found that the sensitivity to temperature was maximal at 25°C, and the optimal moisture content was between 80% and 100% of field capacity.
Journal ArticleDOI
Bacterial and fungal community structure in Arctic tundra tussock and shrub soils.
TL;DR: The communities were relatively stable between sample dates at the phyla and subphyla levels, but differed significantly at finer phylogenetic scales, which appears consistent with previous work demonstrating that shrub soils contain an active, bioavailable C fraction, while tussock soils are dominated by more recalcitrant substrates.
References
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TL;DR: Quality Control and Quality Assurance in Applied Soil Microbiology and Biochemistry in applied soil microbiology and biochemistry and field methods.