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HERO ID
3323456
Reference Type
Journal Article
Title
Fluxes of nitrous oxide and nitric oxide from experimental excreta patches in boreal agricultural soil
Author(s)
Maljanen, M; Martikkala, M; Koponen, HT; Virkajarvi, P; Martikainen, PJ
Year
2007
Is Peer Reviewed?
1
Journal
Soil Biology and Biochemistry
ISSN:
0038-0717
EISSN:
1879-3428
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Location
OXFORD
Volume
39
Issue
4
Page Numbers
914-920
DOI
10.1016/j.soilbio.2006.11.001
Web of Science Id
WOS:000244831900009
Abstract
Nitric oxide (NO) and nitrous oxide (N2O) emissions were measured from experimental dung and urine patches placed on boreal pasture soil during two growing seasons and one autumn period until soil freezing. N2O emissions in situ were studied by a static chamber method. NO was measured with a dynamic chamber method using a NO analyser in situ. Mean emissions from the control plots were 47.6 +/- 4.5 mu g N2O-N m(-2) h(-1) and 12.6 +/- 1.6 mu g NO-N m(-2) h(-1). N2O and NO emissions from urine plots (132 +/- 21.2 mu g N2O-N m(-2) h(-1) and 51.9 +/- 7.6 mu g NO-N m(-2) h(-1)) were higher than those from dung plots (110.0 +/- 20.1 mu g N2O-N m(-2) h(-1) and 14.7 +/- 2.1 mu g NO-N m(-2) h(-1)). There was a large temporal variation in N2O and NO emissions. Maximum N2O emissions were measured a few weeks after dung or urine application, whereas the maximum NO emissions were detected the following year. NO was responsible on average 14% (autumn) and 34% (summer) of total (NO + N2O)-N emissions from the pasture soil. NO emissions increased with increasing soil temperature and with decreasing soil moisture. N2O emissions increased with increasing soil moisture, but did not correlate with soil temperature. Therefore we propose that N2O and NO were produced mainly during different microbial processes, i.e., nitrification and denitrification, respectively. The results show that the overall conditions and mechanism especially for emissions of NO are still poorly understood but that there are differences in the mechanisms regulating N2O and NO production. (c) 2006 Elsevier Ltd. All rights reserved.
Keywords
agricultural soil; dung; NH3; nitric oxide; nitrous oxide; NO3; urine; WFPS
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