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Sammanfattning

Streams and river networks are increasingly recognized as significant sources for the greenhouse gas nitrous oxide (N2O). N2O is a transformation product of nitrogenous compounds in soil, sediment and water. Agricultural areas are considered a particular hotspot for emissions because of the large input of nitrogen (N) fertilizers applied on arable land. However, there is little information on N2O emissions from forest streams although they constitute a major part of the total stream network globally. Here, we compiled N2O concentration data from low-order streams (~1,000 observations from 172 stream sites) covering a large geographical gradient in Sweden from the temperate to the boreal zone and representing catchments with various degrees of agriculture and forest coverage. Our results showed that agricultural and forest streams had comparable N2O concentrations of 1.6 +/- 2.1 and 1.3 +/- 1.8 mu g N/L, respectively (mean +/- SD) despite higher total N (TN) concentrations in agricultural streams (1,520 +/- 1,640 vs. 780 +/- 600 mu g N/L). Although clear patterns linking N2O concentrations and environmental variables were difficult to discern, the percent saturation of N2O in the streams was positively correlated with stream concentration of TN and negatively correlated with pH. We speculate that the apparent contradiction between lower TN concentration but similar N2O concentrations in forest streams than in agricultural streams is due to the low pH (

Nyckelord

agriculture; forest; greenhouse gas; nitrogen; nitrous oxide; river; stream

Publicerad i

Global Change Biology
2020, volym: 26, nummer: 2, sidor: 629-641

SLU författare

Associerade SLU-program

Skog
Övergödning
Klimat
Använder FOMA data

UKÄ forskningsämne

Geokemi
Miljövetenskap
Klimatvetenskap

Publikationens identifierare

  • DOI: https://doi.org/10.1111/gcb.14812

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/103074