DOI: 10.1016/j.foreco.2016.10.047
Scopus记录号: 2-s2.0-84993990017
论文题名: Crown dynamics and wood production of Douglas-fir trees in an old-growth forest
作者: Ishii H.R. ; Sillett S.C. ; Carroll A.L.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 384 起始页码: 157
结束页码: 168
语种: 英语
英文关键词: Biomass production
; Correlative inhibition
; Crown structure
; Growth limitation
; Tree size
Scopus关键词: Carbon
; Core samples
; Dynamics
; Ecology
; Allometric equations
; Biomass productions
; Crown structure
; Diameter-at-breast heights
; Growth limitations
; Pseudotsuga menziesii
; Tree size
; Vertical distributions
; Forestry
; aboveground production
; allometry
; canopy architecture
; coniferous tree
; correlation
; evergreen tree
; forestry production
; ground-based measurement
; growth response
; habitat fragmentation
; limiting factor
; mortality
; old-growth forest
; phytomass
; size distribution
; vertical distribution
; wood
; United States
; Washington [United States]
; Abies
; Pseudotsuga
; Pseudotsuga menziesii
英文摘要: Large trees are the most prominent structural features of old-growth forests, which are considered to be globally important carbon sinks. Because of their large size, estimates of biomass and growth of large trees are often based on ground-level measurements (e.g., diameter at breast height, DBH) and little is known about growth dynamics within the crown. As trees increase in size, growth of the crown may not be reflected in DBH measurements contributing to inaccuracy of aboveground forest productivity. Here we present data from a 10-yr re-measurement of crown structure and branch/trunk growth of 400-year-old Pseudotsuga menziesii trees in an old-growth forest in western Washington, USA. In six study trees, 40–60% of branches occurred in the upper third of the live crown. Branch mortality over 10 years was highest in the lower third of the crown. Of live-branch mass (including leaf mass), 41–78% occurred in the middle third of the live crown. During the study period, live-branch mass increased in the upper half of the crown and there was little loss due to fragmentation or death. In contrast, increment of live-branch mass was negligible and live-branch mass decreased in the lower half of the crown. On average, 70–99% of the increment of live-branch mass per tree occurred in the upper half of the crown. Core samples taken from various heights indicated that trunks became less tapered with increasing age as a result of greater increments of upper-trunk radius during the most recent 10 years. Increment of live-branch mass contributed 42 and 66% of the whole-tree and upper-crown increments of mass, respectively, and its vertical distribution corresponded to that of leaf mass density. Increments of trunk mass contributed 88% of the lower-crown increment. Growth increments of the crown were not reflected in core samples taken at lower heights. Our estimates of trunk, branch, and leaf mass were consistently smaller than those calculated using empirical allometric equations based on tape-wrap measurements of DBH. Moreover, leaf mass decreased in four trees, whereas allometric equations predicted increases. Our results indicate that large P. menziesii trees can sustain wood mass production, especially in trunk and branches of the upper crown, while leaf mass change can be more dynamic, and that such growth dynamics of the crown are difficult to detect via DBH-based measurements. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64593
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Plant Science, Graduate School of Agricultural Science, Kobe University, Kobe, Japan; Department of Forestry and Wildland Resources, Humboldt State University, Arcata, CA, United States
Recommended Citation:
Ishii H.R.,Sillett S.C.,Carroll A.L.. Crown dynamics and wood production of Douglas-fir trees in an old-growth forest[J]. Forest Ecology and Management,2017-01-01,384