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Nitrogen cycling

A grassy landscape next to a river and the ocean.
Posted inNews

A Global Map of Human Sewage in Coastal Ecosystems

by Katherine Kornei 3 December 202128 March 2022

Prodigious quantities of nitrogen from human waste flow into coastal waters, a study of nearly 135,000 watersheds reveals.

Posted inEditors' Highlights

What Controls Nitrous Oxide Emissions from Rivers?

by Nicolas Gruber 22 November 202128 March 2022

Statistical and numerical models show that denitrification efficiency is a key parameter controlling the production of N2O from rivers, providing a target for river restoration projects.

Lake Cadagno—an alpine lake in Switzerland with calm blue-green waters surrounded by sharp-peaked mountains
Posted inNews

Purple Bacteria Fix Nitrogen in Proterozoic-Analogue Lake

by Elise Cutts 28 September 202129 September 2021

A new study challenges the assumption that cyanobacteria were the only major nitrogen fixers in the Proterozoic eon.

路边的沟渠可以在水进入水道之前有效地将水中的氮去除。图片来源: Corianne Tatariw
Posted inResearch Spotlights

路边沟渠可有效脱氮

by Sarah Derouin 7 September 202121 March 2022

研究人员比较了那些为森林、城市和农业用地排水的沟渠中微生物的脱氮潜力,发现路边沟渠是去除养分的重要区域。

Photo of two corn hybrid species growing in a field. The adult hybrid plants at left are green, whereas the hybrid plants at right are yellow and dried.
Posted inNews

Index Suggests That Half of Nitrogen Applied to Crops Is Lost

by Jenessa Duncombe 23 August 202118 April 2022

Food production is becoming less efficient at using nitrogen fertilizer, according to a review of global values. Excess nitrogen damages the environment and the climate.

Roadside ditches can remove nitrogen from water before it gets to waterways.
Posted inResearch Spotlights

Roadside Ditches Are Effective at Nitrogen Removal

by Sarah Derouin 4 August 202121 March 2022

Researchers compared the nitrogen removal potential by microbes in ditches that drained forested, urban, and agricultural lands and discovered that roadside ditches are important areas for removing nutrients.

Posted inResearch Spotlights

A Well-Balanced Ecosystem Uses Water Most Efficiently

by Elizabeth Thompson 13 May 202128 September 2021

Excess of a single nutrient, such as nitrogen, may boost plant productivity, but the imbalance leads to less efficient water use as plants scramble for the nutrients they lack.

Two plots comparing seasonal variability in mussel stable isotope values from the periostracum with measured suspended particulate organic matter, used to reconstruct the isotopic composition of suspended particulate organic matter.
Posted inEditors' Highlights

Tracking Excess Nitrogen with Freshwater Mussels

by B. Williams 30 April 202122 December 2021

Mussel shell periostracum and carbonate bound organic matter document seasonal variability in the isotopic composition of riverine suspended particulate organic matter.

A soccer goalie dives for the ball
Posted inNews

Turf’s Dirty Little Secret

by Jenessa Duncombe 14 April 202128 March 2022

Greenhouse gas emissions from sports fields may be scoring points for climate change.

An illustration showing a protoplanetary disk surrounding a young Sun-like star
Posted inNews

Half of Earth’s Nitrogen May Be Homegrown

by L. Supriya 3 March 202115 February 2022

A new analysis of iron meteorites reveals a distinct isotopic signature that suggests nitrogen was present around early Earth.

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