DOI: 10.1007/s10533-014-9992-z
Scopus记录号: 2-s2.0-84904799845
论文题名: Growing season nitrous oxide fluxes across a 125+ year harvested red spruce forest chronosequence
作者: McVicar K. ; Kellman L.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 120, 期: 2018-01-03 起始页码: 225
结束页码: 238
语种: 英语
英文关键词: Chronosequence
; Forest harvesting
; Greenhouse gas fluxes
; Nitrogen cycling
; Nitrous oxide
; Soil incubation
; Soil moisture
; Soil temperature
Scopus关键词: Picea
; Picea rubens
英文摘要: Forest harvesting alters the cycling of nitrogen (N) within temperate forest systems in a manner that may influence atmospheric nitrous oxide (N2O) concentrations. This paper investigates, over a single growing season within the Acadian Forest region of Atlantic Canada, soil N2O fluxes across a clearcut harvest red spruce forest chronosequence that includes an old growth reference site (>125 years). A pulse of soil N2O at ~1-2 years was observed after clearcut harvesting, followed by an exponential decay to a baseline level within one to two decades after the harvesting event. No significant differences between fluxes from the forest sites >20 years of age and the reference old growth site (>125 years) were observed. Soils within the chronosequence acted as both sources and sinks for N2O through the growing season. Low soil N availability was identified as the likely factor limiting soil N2O flux responses to changes in soil temperature and moisture in situ at most sites. This was confirmed by controlled laboratory experiments that measured soil N2O flux responses to moisture, temperature and N amendments. Without N amendments, soils act as an elevated sink for N2O under increased temperature. However, when soil N was not limiting, N2O flux responded primarily to moisture. Overall, the study suggests that moist temperate forest soils that are N-limited can act as a transient source of N2O following clearcut harvesting during the growing season, and that the decrease in the release of N2O from soils following harvesting follows an exponential pattern. © 2014 Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83643
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Earth Sciences, St. Francis Xavier University, PO Box 5000, Antigonish, NS, B2G 2W5, Canada
Recommended Citation:
McVicar K.,Kellman L.. Growing season nitrous oxide fluxes across a 125+ year harvested red spruce forest chronosequence[J]. Biogeochemistry,2014-01-01,120(2018-01-03)