No effect of warming and watering on soil nitrous oxide fluxes in a temperate sitka spruce forest ecosystem
2020
Zou, Junliang | Osborne, Bruce
Soil fluxes of nitrous oxide (N₂O) play an important role in the global greenhouse gas budget. However, the response of soil N₂O emissions to climate change in temperate forest plantations is not yet well understood. In this study, we assessed the responses of soil N₂O fluxes to experimental warming with or without water addition, using a replicated in situ heating (~2°C above ambient) and water addition (170 mm) experiment in a temperate Sitka spruce plantation forest over the period 2014–2016. We found that seasonal fluxes of N₂O during the year were highly variable, ranging from net uptake to net emissions. Seasonal variations in soil N₂O fluxes were not correlated with either soil temperature or soil moisture. In addition, none of the individual warming/watering treatments, or their interactions, had significant effects on soil N₂O fluxes and N-related soil properties. Overall, our results suggest that despite future increases in temperature, soil N₂O emission may remain largely unchanged in many temperate forest ecosystems that are often N-limited.
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