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Forest streams are important sources for nitrous oxide emissions.

https://arctichealth.org/en/permalink/ahliterature309222
Source
Glob Chang Biol. 2020 02; 26(2):629-641
Publication Type
Journal Article
Date
02-2020
Author
Joachim Audet
David Bastviken
Mirco Bundschuh
Ishi Buffam
Alexander Feckler
Leif Klemedtsson
Hjalmar Laudon
Stefan Löfgren
Sivakiruthika Natchimuthu
Mats Öquist
Mike Peacock
Marcus B Wallin
Author Affiliation
Department of Bioscience, Aarhus University, Silkeborg, Denmark.
Source
Glob Chang Biol. 2020 02; 26(2):629-641
Date
02-2020
Language
English
Publication Type
Journal Article
Keywords
Fertilizers
Forests
Nitrous Oxide
Soil
Sweden
Abstract
Streams and river networks are increasingly recognized as significant sources for the greenhouse gas nitrous oxide (N2 O). N2 O 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 N2 O emissions from forest streams although they constitute a major part of the total stream network globally. Here, we compiled N2 O 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 N2 O concentrations of 1.6 ± 2.1 and 1.3 ± 1.8 µg N/L, respectively (mean ± SD) despite higher total N (TN) concentrations in agricultural streams (1,520 ± 1,640 vs. 780 ± 600 µg N/L). Although clear patterns linking N2 O concentrations and environmental variables were difficult to discern, the percent saturation of N2 O 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 N2 O concentrations in forest streams than in agricultural streams is due to the low pH (
PubMed ID
31465582 View in PubMed
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