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Methods for measuring denitrification: diverse approaches to a difficult problem.
TLDR
Comparison of mass balance and stoichiometric approaches that constrain estimates of denitrification at large scales with point measurements (made using multiple methods), in multiple systems, is likely to propel more improvement in Denitrification methods over the next few years.
Measuring gross nitrogen mineralization, and nitrification by 15 N isotopic pool dilution in intact soil cores
SUMMARY The isotope dilution method for measuring gross rates of N mineralization, immobilization, and nitrification was applied to intact soil cores so that the effects of soil mixing were avoided.
Dissimilatory nitrate reduction to ammonium in upland tropical forest soils
The internal transformations of nitrogen in terrestrial ecosystems exert strong controls over nitrogen availability to net primary productivity, nitrate leaching into ground- water, and emissions of
Mechanisms for soil moisture effects on activity of nitrifying bacteria
TLDR
Two independent techniques were used to evaluate the relative importance of cytoplasmic dehydration versus diffusional limitations in controlling rates of nitrification in soil to demonstrate that diffusional limitation of substrate supply and adverse physiologic effects associated with cell dehydration can explain all of the decline in activity of nitrifying bacteria at low soil water content.
Microbial biomass response to a rapid increase in water potential when dry soil is wetted
The proportion of microbial biomass-C released into the soil environment following rapid water potential increase was quantified in two soils using a modified chloroform-fumigation biomass assay. Dry
Plant invasion alters nitrogen cycling by modifying the soil nitrifying community.
TLDR
It is hypothesized that belowground changes to the soil microbial community provide a mechanistic link between exotic plant invasion and changes to ecosystem nutrient cycling.
Evaluating rRNA as an indicator of microbial activity in environmental communities: limitations and uses
TLDR
Evidence indicates that the general use of rRNA as a reliable indicator of metabolic state in microbial assemblages has serious limitations, and the complex and often contradictory relationships between rRNA, growth and activity are highlighted.
Environmental controls on denitrifying communities and denitrification rates: insights from molecular methods.
TLDR
This review summarizes the results of molecular investigations of denitrifier communities in natural environments and provides a framework for developing future research for addressing connections between denItrifier community structure and function.
The role of ecological theory in microbial ecology
TLDR
It is argued that the full potential of the ongoing revolution in microbial ecology will not be realized if research is not directed and driven by theory, and that the generality of established ecological theory must be tested using microbial systems.
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