DOI: 10.1016/j.foreco.2016.01.036
Scopus记录号: 2-s2.0-84958582398
论文题名: Complex mountain terrain and disturbance history drive variation in forest aboveground live carbon density in the western Oregon Cascades, USA
作者: Zald H.S.J. ; Spies T.A. ; Seidl R. ; Pabst R.J. ; Olsen K.A. ; Steel E.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 366 起始页码: 193
结束页码: 207
语种: 英语
英文关键词: Forest carbon
; Forest management
; Landscape heterogeneity
; Lidar
; Topography
; Wildfire
Scopus关键词: Decision trees
; Digital storage
; Ecology
; Ecosystems
; Fires
; Landforms
; Logging (forestry)
; Optical radar
; Timber
; Topography
; Watersheds
; Auto regressive models
; Environmental determinants
; Forest carbons
; H.J. Andrews Experimental Forest
; Landscape heterogeneities
; Light detection and ranging
; Topographic conditions
; Wildfire
; Forestry
英文摘要: Forest carbon (C) density varies tremendously across space due to the inherent heterogeneity of forest ecosystems. Variation of forest C density is especially pronounced in mountainous terrain, where environmental gradients are compressed and vary at multiple spatial scales. Additionally, the influence of environmental gradients may vary with forest age and developmental stage, an important consideration as forest landscapes often have a diversity of stand ages from past management and other disturbance agents. Quantifying forest C density and its underlying environmental determinants in mountain terrain has remained challenging because many available data sources lack the spatial grain and ecological resolution needed at both stand and landscape scales. The objective of this study was to determine if environmental factors influencing aboveground live carbon (ALC) density differed between young versus old forests. We integrated aerial light detection and ranging (lidar) data with 702 field plots to map forest ALC density at a grain of 25 m across the H.J. Andrews Experimental Forest, a 6369 ha watershed in the Cascade Mountains of Oregon, USA. We used linear regressions, random forest ensemble learning (RF) and sequential autoregressive modeling (SAR) to reveal how mapped forest ALC density was related to climate, topography, soils, and past disturbance history (timber harvesting and wildfires). ALC increased with stand age in young managed forests, with much greater variation of ALC in relation to years since wildfire in old unmanaged forests. Timber harvesting was the most important driver of ALC across the entire watershed, despite occurring on only 23% of the landscape. More variation in forest ALC density was explained in models of young managed forests than in models of old unmanaged forests. Besides stand age, ALC density in young managed forests was driven by factors influencing site productivity, whereas variation in ALC density in old unmanaged forests was also affected by finer scale topographic conditions associated with sheltered sites. Past wildfires only had a small influence on current ALC density, which may be a result of long times since fire and/or prevalence of non-stand replacing fire. Our results indicate that forest ALC density depends on a suite of multi-scale environmental drivers mediated by complex mountain topography, and that these relationships are dependent on stand age. The high and context-dependent spatial variability of forest ALC density has implications for quantifying forest carbon stores, establishing upper bounds of potential carbon sequestration, and scaling field data to landscape and regional scales. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65013
Appears in Collections: 影响、适应和脆弱性
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作者单位: Oregon State University, College of Forestry, Corvallis, OR, United States; USDA Forest Service, Pacific Northwest Research Station, Corvallis, OR, United States; University of Natural Resources and Life Sciences (BOKU), Institute of Silviculture, Vienna, Austria; USDA Forest Service, Pacific Northwest Research Station, Seattle, WA, United States
Recommended Citation:
Zald H.S.J.,Spies T.A.,Seidl R.,et al. Complex mountain terrain and disturbance history drive variation in forest aboveground live carbon density in the western Oregon Cascades, USA[J]. Forest Ecology and Management,2016-01-01,366