Long-Term Nitrogen Addition Eliminates the Cooling Effect on Climate in a Temperate Peatland

Long-Term Nitrogen Addition Eliminates the Cooling Effect on Climate in a Temperate Peatland

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Peatlands play a crucial turbo air m3f72-3-n 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 CO2 and CH4 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 Sphagnum mosses were suppressed and opheliasmuse.com 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 Sphagnum decline.

Instead, it further increased CH4 emissions.These findings suggest that sustained N input may diminish the C sequestration function of peatlands, significantly weakening their global cooling effect.