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Updated: May 9, 2026

A CO2 Concentration Gradient Facility for Testing CO2 Enrichment and Soil Effects on Grassland Ecosystem Function
Published on: November 21, 2015
Multi-nutrient vs. nitrogen-only effects on carbon sequestration in grassland soils.
Dario A Fornara1, Lindsay Banin, Michael J Crawley
1Environmental Sciences Research Institute, University of Ulster, Coleraine, BT52 1SA, UK.
Nutrient fertilization impacts soil carbon storage. While multi-nutrient additions constrain carbon sequestration, nitrogen-only additions significantly enhance it in grasslands, affecting ecosystem services.
Area of Science:
- Soil Science
- Ecology
- Environmental Science
Background:
- Human activities increase nutrient availability (nitrogen, phosphorus, potassium, magnesium) in soils globally.
- Nutrient fertilization boosts plant productivity but can alter soil carbon (C) storage, a critical terrestrial carbon pool.
- The effects of single nutrient additions versus combined nutrient additions on soil C sequestration in managed ecosystems require further investigation.
Purpose of the Study:
- To investigate the long-term effects of single nitrogen (N) addition versus multi-nutrient (NPKMg) addition on soil C sequestration in a permanent grassland.
- To determine how nutrient additions influence soil C stocks and related ecosystem properties over 19 years.
- To assess the role of nutrient fertilization as a driver of global change in grassland ecosystems.
Main Methods:
- Utilized a 19-year-old nutrient addition experiment in a permanent grassland setting.
- Compared soil C sequestration under single N fertilization, combined NPKMg fertilization, and unfertilized conditions.
- Analyzed effects across different grazing and liming treatments to ensure result consistency.
Main Results:
- Combined NPKMg additions constrained soil C sequestration, resulting in C stocks similar to unfertilized plots.
- Single N addition significantly enhanced soil C stocks, with N-only fertilized soils storing an average of 11 t C ha(-1) more than unfertilized soils.
- N-only fertilization increased root mass and detritus accumulation in topsoils, independent of plant diversity or community composition changes. High nitrogen losses were observed with any N addition.
Conclusions:
- Nutrient fertilization is a significant driver of global change impacting grassland ecosystem functioning and long-term sustainability.
- Single N additions can enhance soil C sequestration in grasslands, while multi-nutrient additions may limit this process.
- Understanding nutrient effects is crucial for managing grassland soils and their capacity to deliver ecosystem services.
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