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Atmospheric impact of nitrous oxide uptake by boreal forest soils can be comparable to that of methane uptake
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Atmospheric impact of nitrous oxide uptake by boreal forest soils can be comparable to that of methane uptake
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Journal Article
Atmospheric impact of nitrous oxide uptake by boreal forest soils can be comparable to that of methane uptake
2020
Overview
Aims
Environmental factors controlling nitrous oxide (N
2
O) uptake in forest soils are poorly known, and the atmospheric impact of the forest N
2
O sink is not well constrained compared to that of methane (CH
4
).
Methods
We compared nitrous oxide (N
2
O) and CH
4
fluxes over two growing seasons in boreal forest soils located in Eastern Finland. Within a spruce forest, we compared plots with long-term nitrogen (N) fertilization history and non-fertilized plots, and additionally pine forest plots without a fertilization history. The flux data was complemented with measurements of climatic conditions and soil physical and chemical characteristics, in order to identify factors affecting N
2
O and CH
4
fluxes.
Results
Non-fertilized spruce forest soils showed the highest cumulative N
2
O uptake among the sites, whereas the pine forest site displayed low cumulative N
2
O emission. Nitrous oxide uptake was favored by high soil silt and water content. The low temperature seasons, spring and autumn, had the highest N
2
O uptake, likely associated with high soil water content typical for these seasons. In the spruce forest the N
2
O uptake was seasonally decoupled from the CH
4
uptake.
Conclusions
Applying the Global Warming Potential (GWP) approach, the cooling effect of N
2
O uptake in the spruce forest was on average 35% of that of CH
4
uptake showing that N
2
O uptake should be considered when evaluating the atmospheric impact of boreal forests.
Publisher
Springer International Publishing
Subject
