DOI: 10.1016/j.foreco.2017.07.024
Scopus记录号: 2-s2.0-85026262865
论文题名: Skid trail use influences soil carbon flux and nutrient pools in a temperate hardwood forest
作者: Shabaga J.A. ; Basiliko N. ; Caspersen J.P. ; Jones T.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 402 起始页码: 51
结束页码: 62
语种: 英语
英文关键词: Base cations
; Compaction
; Q10
; Selection silviculture
; Soil organic matter
; Soil respiration
Scopus关键词: Biogeochemistry
; Compaction
; Hardwoods
; Nutrients
; Positive ions
; Soils
; Base cations
; Q<sub>10</sub>
; Selection silvicultures
; Soil organic matters
; Soil respiration
; Forestry
英文摘要: Skid trails comprise up to 40% of managed forest areas and are subject to wide variations in disturbance intensity. Despite potential for accelerated carbon (C) and nutrient losses following use, they are under-represented in studies of forest soil biogeochemistry. To address this, we assessed soil chemistry and respiration as CO2 efflux (FCO2) on primary and tertiary skid trails relative to adjacent cut forest (control) between May and October, following a winter partial-harvest in a northern hardwood forest. Primary trails were highly mixed and compacted (bulk density: ≈1.18 g cm−3) relative to forest controls (≈0.53 g cm−3) and tertiary trails (≈0.59 g cm−3). FCO2 rates corrected for higher trail temperatures (+2.5 °C) were half that of controls. An absence of root respiration likely accounted for most of this difference, with precipitation event-based moisture saturation and labile C limitations for heterotrophs accounting for the remainder. A similar but weaker pattern was found for tertiary trails: after correcting for higher temperatures (+0.7 °C), trails produced 23% less FCO2 than controls in ruts only, suggesting compaction and/or root damage inhibited FCO2. Concentrations of soil C, N, and cations were 16–52% lower on frequently re-used primary skid trails and 13–30% lower on tertiary skid trails than adjacent forest controls, but 0–20 cm pool sizes were similar amongst treatments. All treatments, except for primary skid trails, expressed substantial inter-correlated declines in soil C, N, and cations (−7% to −40%) by October that were also correlated to FCO2 rates (r2 = 0.10, p < 0.05), suggesting losses were related to enhanced decomposition. Overall, both cut forest and tertiary trails may be areas of substantial short-term C loss, with greater potential net losses on denuded trails. Conversely, primary skid trails were likely small but persistent atmospheric C sources due to chronically inhibited regrowth, yet paradoxically provided greater SOC retention than tertiary trails and controls. Although better long-term measurements of C and nutrient flux are needed, skid trails comprise discrete management units that may respond predictably to use. Inclusion of these as components in models of forest biogeochemistry may improve the accuracy of flux predictions. © 2017 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64161
Appears in Collections: 影响、适应和脆弱性
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作者单位: Forest Research and Monitoring Section, Ontario Ministry of Natural Resources and Forestry, 1235 Queen St. E., Sault Ste. Marie, ON, Canada; University of Toronto Mississauga, Department of Geography, 3359 Mississauga Road North, Mississauga, ON, Canada; Laurentian University, Department of Biology and the Vale Living with Lakes Centre, 935 Ramsey Lake Road, Sudbury, Ontario, Canada; University of Toronto, Faculty of Forestry, 33 Willcocks St., Toronto, Ontario, Canada
Recommended Citation:
Shabaga J.A.,Basiliko N.,Caspersen J.P.,et al. Skid trail use influences soil carbon flux and nutrient pools in a temperate hardwood forest[J]. Forest Ecology and Management,2017-01-01,402