DOI: 10.1016/j.foreco.2015.08.035
Scopus记录号: 2-s2.0-84941065988
论文题名: Separating effects of crown structure and competition for light on trunk growth of Sequoia sempervirens
作者: Coonen E.J. ; Sillett S.C.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 358 起始页码: 26
结束页码: 40
语种: 英语
英文关键词: Competition
; Light availability
; Sequoia sempervirens
; Tree growth
; Tree size
; Vigor
Scopus关键词: Competition
; Wood
; Light availability
; Sequoia sempervirens
; Tree growth
; Tree size
; Vigor
; Forestry
; canopy architecture
; competition (ecology)
; evergreen tree
; fitness
; forest ecosystem
; growth rate
; light availability
; morphology
; photography
; tree
; vigor
; Branches
; Competition
; Photography
; Sequoia
; Sequoia sempervirens
英文摘要: Tree-level productivity is largely determined by crown size and aboveground vigor, but light availability ultimately controls growth. Competition indices are typically used in modeling instead of actual measurements of light. Our goals were to determine which measure of light best predicts trunk growth increments of Sequoia sempervirens, to quantify the amount of growth variation explained by light after accounting for effects of tree structure, and to compare model fitness of various competition indices. Twenty-four trees spanning a wide range of light environments were randomly selected from stands of different ages, including trees 23-72m tall and 20-560years old. Tree structure and trunk growth increments were quantified via direct measurements of all branches and coring main trunks at multiple heights. Light availability was quantified via hemispherical photography throughout tree crowns. Competition indices were computed by measuring the size and distribution of neighboring trees. The largest tree had 69m3 of wood and bark, 3208m2 of leaf area, and produced 1.04m3yr-1 of wood in the main trunk, whereas the smallest tree had less than 1m3 of wood and bark, 134m2 of leaf area, and produced 0.04m3yr-1 of wood in the main trunk. After accounting for tree structure, light availability explained an additional 10% of variation in trunk wood volume increment. Light availability alone explained 49% of the variation in wood volume increment, while tree size alone explained 41%. The growth model with average mid-crown openness as the measure of light availability was 19 times more likely than the model without a term for light. A distance-dependent competition index computing neighboring tree crown volume (DDCV) was >1200 times more likely than any other competition index in the best growth model. Together with tree size and aboveground vigor, DDCV explained 91% of variation in trunk wood volume increment. © 2015 Published by Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65235
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forestry and Wildland Resources, Humboldt State University, 1 Harpst Street, Arcata, CA, United States
Recommended Citation:
Coonen E.J.,Sillett S.C.. Separating effects of crown structure and competition for light on trunk growth of Sequoia sempervirens[J]. Forest Ecology and Management,2015-01-01,358