DOI: 10.1016/j.foreco.2016.05.050
Scopus记录号: 2-s2.0-84973117944
论文题名: Examining the influences of tree-to-tree competition and climate on size-growth relationships in hydric, multi-aged Fraxinus nigra stands
作者: Looney C.E. ; D'Amato A.W. ; Fraver S. ; Palik B.J. ; Reinikainen M.R.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2016
卷: 375 起始页码: 238
结束页码: 248
语种: 英语
英文关键词: Climate
; Competition
; Fraxinus nigra
; Size-growth relationship
; Wetland forest
Scopus关键词: Competition
; Drought
; Efficiency
; Landforms
; Wetlands
; Asymmetric competition
; Climate
; Competitive interactions
; Fraxinus
; Growth and competition
; Short-term variations
; Size growths
; Wetland forests
; Forestry
; climate change
; competition (ecology)
; data set
; deciduous tree
; dendrochronology
; growth rate
; size distribution
; stand dynamics
; wetland
; Minnesota
; United States
; Fraxinus nigra
英文摘要: Most research on tree-tree competition and size-growth relationship (SGR - a stand-level metric that infers the relative efficiency with which different sized trees utilize available resources) has focused on upland systems. It is unclear if inferences from these studies extend to wetland forests. Moreover, no study to date has thoroughly investigated the relationship between individual tree-tree competition and SGR. To fill these research gaps, we conducted a dendrochronological study examining the relationship of tree-tree competition, SGR, and climate in late-successional Fraxinus nigra (black ash) wetland forests in northern Minnesota, USA. We took advantage of a detailed, stem-mapped dataset of 1670 trees in five late-successional, multi-aged stands to explore the following research questions: (1) how do competitive interactions, particularly size symmetry, influence individual-tree growth; (2) do late-successional F. nigra stands display inverse asymmetric SGR; and (3) do short-term variations in drought influence SGR in F. nigra wetland forests? Using neighborhood competition indices, which characterize the growth of individual trees based on the size, number, and distance of competitors, we examined the nature and strength of individual tree-tree interactions. Additionally, we used SGR to determine how tree size and individual tree contributions to stand productivity relate to changes in stand growth and competitive interactions during stand development. At the individual tree level, we found evidence of size-asymmetric competition, with larger trees disproportionately suppressing the growth of smaller trees. However, tree size was a stronger predictor of growth than competition at all sites. At the stand level, our multi-aged F. nigra sites showed consistent patterns of inverse size-asymmetric SGR (i.e., smaller individual trees growing at disproportionately higher rates relative to larger trees), which is generally consistent with previous observations of mature upland forests and supports the hypothesis that large trees decline in relative growth as stands age. While seemingly counter-intuitive, the simultaneous presence of size-asymmetric individual tree-level competition and stand-level inverse asymmetric SGR suggests declines in large tree production efficiency. Drought effects on SGR, as expressed by PDSI, while sometimes evident, appeared weak on both relatively mesic and extremely wet sites. Our findings, which are consistent with previous studies of both F. nigra wetlands and upland forests, demonstrate that the combined results of individual-tree competition models and stand-level SGR can provide deeper insights into growth and competition in F. nigra and other forest types. © 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64850
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: University of Minnesota, Department of Forest Resources, St. Paul, MN, United States; University of Vermont, Rubenstein School of Environment and Natural Resources, Burlington, VT, United States; University of Maine, School of Forest Resources, Orono, ME, United States; USDA Forest Service, Northern Research Station, Grand Rapids, MN, United States; University of Minnesota, Cloquet Forestry Center, Cloquet, MN, United States
Recommended Citation:
Looney C.E.,D'Amato A.W.,Fraver S.,et al. Examining the influences of tree-to-tree competition and climate on size-growth relationships in hydric, multi-aged Fraxinus nigra stands[J]. Forest Ecology and Management,2016-01-01,375