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
High potential, but low actual, glycine uptake of dominant plant species in three Australian land-use types with intermediate N availability
TL;DR: In ecosystems with intermediate N availability, mineral N is the plants’ main N source, while LMW organic N is of less ecological relevance to plant N nutrition, in contrast to several previous studies.
Journal ArticleDOI
Fire effects on gross inorganic N transformation in riparian soils in coniferous forests of central Idaho, USA: wildfires v. prescribed fires
TL;DR: This paper investigated differences between wildfires and prescribed fires in their effects on nitrogen (N) dynamics in mineral soils collected from riparian coniferous forests of central Idaho, USA Specifically, they investigated how the two types of fires affected inorganic N concentrations, microbial biomass N and gross transformation rates of inorganic n in mineral soil relative to their corresponding unburnt controls and found no significant difference in soil NH4+ concentrations between burnt and control soils in either type of fires.
Journal ArticleDOI
Quick start guide to soil methods for ecologists
Lora B. Perkins,Robert R. Blank,Scot D. Ferguson,Dale W. Johnson,William C. Lindemann,Ben M. Rau +5 more
TL;DR: This review provides a brief introduction into soils and discusses issues related to soil sterilization, choosing a soil for a greenhouse project, sampling soils, and soil analyses to familiarize researchers with essential information to appropriately incorporate soil analyses into ecological studies.
Journal ArticleDOI
Unprecedented Atmospheric Ammonia Concentrations Detected in the High Arctic From the 2017 Canadian Wildfires
Erik Lutsch,Kimberly Strong,Dylan B. A. Jones,Ivan Ortega,James W. Hannigan,Enrico Dammers,Mark W. Shephard,Eleanor Morris,Killian L. Murphy,Mathew J. Evans,Mark Parrington,Simon Whitburn,Martin Van Damme,Lieven Clarisse,Pierre-François Coheur,Cathy Clerbaux,Cathy Clerbaux,Betty Croft,Randall V. Martin,Jeffrey R. Pierce,Jenny A. Fisher +20 more
TL;DR: In this article, simultaneous enhancements of ammonia (NH3), carbon monoxide (CO), hydrogen cyanide (HCN), and ethane (C2H6) were detected from ground-based solar absorption Fourier transform infrared (FTIR) spectroscopic measurements at two high-Arctic sites.
Journal ArticleDOI
Rapid recovery of nitrogen retention capacity in a subtropical acidic soil following afforestation
Yu Xie,Lin Yang,Tongbin Zhu,Hui Yang,Jianbing Zhang,Jin-Ling Yang,Jianhua Cao,Bing Bai,Zhongcheng Jiang,Yueming Liang,Funing Lan,Lei Meng,Christoph Müller,Christoph Müller +13 more
TL;DR: Wang et al. as discussed by the authors investigated the inherent N transformation processes involved in N availability in subtropical acidic soils and found that afforestation stimulated the rates of mineralization, microbial NH4+ immobilization and adsorption of NH4+, leading to a faster turnover of NH 4+ pool in afforested soils.
References
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