In:
Canadian Journal of Soil Science, Canadian Science Publishing, Vol. 93, No. 4 ( 2013-09), p. 415-425
Abstract:
Pelster, D. E., Chantigny, M. H., Rochette, P., Angers, D. A., Laganière, J., Zebarth, B. and Goyer, C. 2013. Crop residue incorporation alters soil nitrous oxide emissions during freeze–thaw cycles. Can. J. Soil Sci. 93: 415–425. Freeze–thaw (FT) cycles stimulate soil nitrogen (N) and carbon (C) mineralization, which may induce nitrous oxide (N 2 O) emissions. We examined how soybean (Glycine max L.) and corn (Zea mays L.) residue incorporation affect N 2 O emissions from high C content (35 g kg −1 ) silty clay and low C content (19 g kg −1 ) sandy loam soils over eight 10-d FT cycles, as a function of three temperature treatments [constant at +1°C (unfrozen control), +1 to −3°C (moderate FT), or +1 to −7°C (extreme FT)]. In unamended soils, N 2 O emissions were stimulated by FT, and were the highest with extreme FT. This was attributed to the increased NO 3 availability measured under FT. Application of mature crop residues (C:N ratios of 75 for soybean and 130 for corn) caused rapid N immobilization, attenuating FT-induced N 2 O emissions in the silty clay. In the sandy loam, residue addition also induced immobilization of soil mineral N. However, N 2 O emissions under moderate FT were higher with than without crop residues, likely because N 2 O production in this low-C sandy loam was stimulated by C addition in the early phase of incubation. We conclude that FT-induced N 2 O emissions could be reduced through incorporation of mature crop residues and the subsequent immobilization of mineral N, especially in C-rich soils.
Type of Medium:
Online Resource
ISSN:
0008-4271
,
1918-1841
DOI:
10.4141/cjss2012-043
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2013
detail.hit.zdb_id:
2017003-8
detail.hit.zdb_id:
417254-1
SSG:
13
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