DOI: 10.1016/j.foreco.2014.08.023
Scopus记录号: 2-s2.0-84907960461
论文题名: Structure of early old-growth Douglas-fir forests in the Pacific Northwest
作者: Freund J.A. ; Franklin J.F. ; Lutz J.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 335 起始页码: 11
结束页码: 25
语种: 英语
英文关键词: Douglas-fir
; Forest structure
; Mortality
; Old-growth
; Pseudotsuga menziesii
; Stand development
Scopus关键词: Douglas fir
; Forest structure
; Mortality
; Old-growth
; Pseudotsuga menziesii
; Stand development
; coniferous tree
; ecosystem management
; mortality
; old-growth forest
; spatial variation
; stand structure
; Pacific Northwest
; Pseudotsuga
; Pseudotsuga menziesii
英文摘要: Few empirical studies exist on structural transitions from mature forests dominated by Douglas-fir to structurally complex older forests. Stand structure (live tree diameter, height distributions, snag and log metrics) and composition of nine early old-growth (200-350years old) forests were quantified and compared with those of fully developed old-growth (400-600years old) forests. We investigated Douglas-fir and western hemlock-dominated forests of the Pacific Northwest where Douglas-fir established following a single stand-replacing disturbance. Stand-level attributes were summarized using descriptive statistics, nonlinear regression, and old-growth indices. Variability in individual structural features was large between sites but broadly consistent with models of natural Douglas-fir forest development. Compared to older (>450years old) forests, diameter distributions exhibited similar reverse J-shapes. Tree height distributions showed that shade tolerant species occupy lower canopy positions. Coarse woody debris was abundant in early old-growth forests for both snags (42-140m3ha-1) and logs (172-584m3ha-1). Early old-growth stands scored high enough on old-growth indices to qualify as old growth but their scores were significantly lower than older forests (400-600years-old). Early old-growth structure fits well with the natural conceptual model of development providing a basis for ecologically focused management. Furthermore, structural conditions and variability of early old-growth forests provides a closer temporal target for managers seeking to accelerate the development of structure in younger stands or retain natural elements such as spatial patterning of trees. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65669
Appears in Collections: 影响、适应和脆弱性
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作者单位: School Environmental and Forest Sciences, University of Washington, Seattle, WA, United States; Quinney College of Natural Resources, Utah State University, Logan, UT, United States
Recommended Citation:
Freund J.A.,Franklin J.F.,Lutz J.A.. Structure of early old-growth Douglas-fir forests in the Pacific Northwest[J]. Forest Ecology and Management,2015-01-01,335