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nitrogen

A beach in the Florida Keys
Posted inNews

Shallow Injection Imperfectly Filters Florida Wastewater

by Caroline Hasler 26 September 202526 September 2025

Injection of wastewater into shallow wells is meant to filter nutrients like nitrogen and phosphorus out of the wastewater. But a new study suggests that nutrients aren’t entirely eliminated—and may be polluting coastal waters.

Bison graze on green grass at Yellowstone National Park near a wire exclosure used to measure grasses.
Posted inNews

Free-Roaming Bison Graze Life into Grasslands

by Rebecca Owen 24 September 202524 September 2025

A new study suggests that Yellowstone’s herd of bison accelerates nutrient cycling, offering a glimpse into the North American plains of yesteryear.

A cluster of small, shiny red objects is attached to the roots of a plant.
Posted inNews

Nitrogen Needs Could Be Limiting Nature’s Carbon Capacity

by Rebecca Owen 25 August 202525 September 2025

A new study suggests that past calculations of biological nitrogen fixation were overestimated by up to 66%—and that farms growing nitrogen-fixing crops may be filling in the gaps, for better or worse.

A satellite image of a river becoming a fan-shaped delta and then draining into the ocean.
Posted inResearch Spotlights

Arctic Rivers Trade Inorganic Nitrogen for Organic

by Saima May Sidik 6 August 20256 August 2025

Climate change is shifting the makeup of a key nutrient in rivers across Russia, Alaska, and Canada, with the potential for ecosystem-wide impacts.

Snow-covered surface with dark patches of soil uncovered. Steam is rising from some patches.
Posted inNews

As the Arctic Warms, Soils Lose Key Nutrients

Javier Barbuzano, Science Writer by Javier Barbuzano 1 August 202526 August 2025

Climate change heats not only the air and the ocean but also the soil, where key processes that determine fertility and carbon sequestration operate in a fine-tuned balance.

Close-up of a partially surfaced humpback whale showing its baleen
Posted inNews

A Great Whale Conveyor Belt Transports Nutrients Across Oceans

Adityarup Chakravorty, freelance science writer by Adityarup Chakravorty 5 May 20255 May 2025

Baleen whales shift huge amounts of nutrients, including nitrogen, from high-latitude feeding waters to tropical breeding areas.

The floor of a foggy forest is covered in orange and brown leaves. In the middle distance, two researchers are taking measurements of a narrow stream.
Posted inResearch Spotlights

The “Surprising” Effect of Drying Headwaters on Nitrogen Dynamics

by Saima May Sidik 15 April 202515 April 2025

Contrary to predictions, spring rains caused a decrease in nitrogen at watershed outflows in Alabama.

Photo of a river
Posted inEditors' Highlights

Carbon-Nutrient Ratios Drive Nitrate Removal in Mediterranean Streams

by Kyle Boodoo and Suzanne Tank 19 March 202519 March 2025

The type of organic matter, and ratio of nutrients to carbon, impact the ability of heterotrophic bacteria to effectively remove certain forms of nitrogen pollution (nitrate) from streams.

Photo of the empty streets of Times Square.
Posted inEditors' Vox

Particulate Pollution and its Climate Impacts During the COVID-19 Pandemic

by Yuan Wang 24 February 202524 February 2025

The impacts of COVID-19 on short-lived pollutants highlight the predominant influence of the transportation sector and the resulting changes in regional climates and ecosystems.

Photo of a muddy river.
Posted inEditors' Highlights

Physics and Biology as Likely Stream Bedfellows

Eric Davidson, president-elect of AGU by Eric Davidson 18 November 202415 November 2024

Streambeds are key sites for removal of nutrients and other contaminants through microbial processes, but are limited by diffusion, which can now be modeled from streambed physical properties.

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