Long-Term Nitrogen Addition Eliminates the Cooling Effect on Climate in a Temperate Peatland
Peatlands play a crucial role in global carbon (C) sequestration, but their response to long-term nitrogen (N) deposition remains uncertain. This study investigates the effects of 12 years of simulated N addition on CO<sub>2</sub> and CH<sub>4</sub> fluxes in a temperate peat...
Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-04-01
|
| Series: | Plants |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2223-7747/14/8/1183 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Peatlands play a crucial role in global carbon (C) sequestration, but their response to long-term nitrogen (N) deposition remains uncertain. This study investigates the effects of 12 years of simulated N addition on CO<sub>2</sub> and CH<sub>4</sub> fluxes in a temperate peatland through in situ monitoring. The results demonstrate that long-term N addition significantly reduces net ecosystem exchange (NEE), shifting the peatland from a C sink to a C source. This transition is primarily driven by a decline in aboveground plant productivity, as <i>Sphagnum</i> mosses were suppressed and even experienced mortality, while graminoid plants thrived under elevated N conditions. Although graminoid cover increased, it did not compensate for the GPP loss caused by <i>Sphagnum</i> decline. Instead, it further increased CH<sub>4</sub> emissions. These findings suggest that sustained N input may diminish the C sequestration function of peatlands, significantly weakening their global cooling effect. |
|---|---|
| ISSN: | 2223-7747 |