Our results support the hypothesis that denitrifier
community composition influences [N.sub.2]O production in soils.
Good "candidate" mechanisms that might explain [N.sub.2]O emission reductions are pH increases (liming effect) and changes in microbial community composition, particularly changes in the denitrifier
gene expression and abundance, and N (mostly nitrate) capture in biochar particles.
Higher DOC in leachate from microcosms without earthworms suggests that earthworms stimulated denitrifier
use of soluble C.
Changes in denitrifier
abundance, denitrification gene mRNA levels, nitrous oxide emissions, and denitrification in anoxic soil microcosms amended with glucose and plant residues.
(2004) used a range of statistical techniques to quantify denitrifier
enzyme activity, denitrification rate, and nitrous oxide ([N.sub.2]O) flux on complex slopes in Manitoba.
Soil [NO.sub.3]-N levels have been shown to be lower in no-till compared with plow fallow treatments due to reduced spring soil temperatures, lower populations of nitrifier microbes and higher populations of denitrifier
microbes in no-till compared with plow (Broder et al., 1984).
pauculus UM1 had previously been identified as an active denitrifier
, we examined it for the presence of either the nirS or nirK gene by using the primer pairs and amplification conditions described by either Braker et al.
Laughlin et al., "Insights into the effect of soil pH on [N.sub.2]O and [N.sub.2] emissions and denitrifier
community size and activity," Applied and Environmental Microbiology, vol.
(2001) determined that infrequent pulses of N[O.sub.3]-N were sufficient to maintain substantial denitrifier
Cavigelli MA, Robertson GP (2001) Role of denitrifier
diversity in rates of nitrous oxide consumption in a terrestrial ecosystem.
Highest DEA was measured in the top 0.1 m and decreased sharply with depth, probably due to a reduction in the level of organic matter and denitrifier
populations with depth.