Nitrogen (N) is one of the primary nutrients required to build biomass and is therefore in high
demand in aquatic ecosystems. Estuaries, however, are frequently inundated with high …

Until recently, it was believed that biological assimilation and gaseous nitrogen (N) loss
through denitrification were the two major fates of nitrate entering or produced within most …

Cyanobacteria are often the key organisms comprising microbial mats. They form dense
micrometer-scale communities in which the full plethora of microbial metabolism can be …

Biologically available nitrogen is removed from ecosystems through the microbial processes
of anaerobic ammonium oxidation (anammox) or denitrification, while dissimilatory nitrate …

Coastal zones are among the most productive marine environments and many are highly
impacted by anthropogenic activity. Coastal zones are key regions for the transformation of …

Sources and co-cycling of nitrogen species in arsenic-prone groundwater remain poorly
understood, which could affect arsenic behavior. Here, geochemical and multi-isotopic …

In the past three decades, China has built more than 87 000 dams with a storage capacity
of≈ 6560 km3 and the total surface area of inland water has increased by 6672 km2 …

Nitrate is an important nutrient and electron acceptor for microorganisms, having a key role
in nitrogen (N) cycling and electron transfer in anoxic sediments. High-nitrate inputs into …

Identifying tipping points in the relationship between aridity and gross nitrogen (N) cycling
rates could show critical vulnerabilities of terrestrial ecosystems to climate change. Yet, the …

Dissimilatory nitrate reduction to ammonium (DNRA) and diazotrophic N 2 fixation contribute
to nitrogen (N) supply in rice paddies, whereas denitrification contributes to N loss …