气候变化领域集成服务门户(CCPortal): Relationships between tree survival, stand structure and age in trembling aspen dominated stands

CCPortal

DOI	10.1016/j.foreco.2019.02.003
	Relationships between tree survival, stand structure and age in trembling aspen dominated stands
	Kweon D.; Comeau P.G.
发表日期	2019
ISSN	0378-1127
起始页码	114
结束页码	122
卷号	438
英文摘要	Canopy openings resulting from tree death provide opportunities for shade intolerant species such as aspen to establish and grow in the understory leading to development of aspen stands with multiple canopy layers and multiple cohorts. Stand structure is likely to influence survival probability since it will lead to differences in competition intensity and in resource utilization. We examined relationships among stand age (years after stand establishment), age structure (age diversity), and tree size diversity (i.e., diversity of diameter classes), using cores collected from 531 aspen trees in 18 stands distributed across the province of Alberta, Canada. Results show positive relationships between stand age, age diversity, and tree size diversity. Logistic mixed effects survival probability models were developed using data from 199 remeasured permanent sample plots. Results show an inverted U-shaped relationship between survival probability and tree diameter. Survival probability trends varied between young (≤60), mature (>60 and ≤ 100), and old (>100) age groups in relation to differences in competition intensity and stand structure. Intraspecific competition (deciduous basal area larger) was negatively related to tree survival and the magnitude of the negative impact was stronger in the young age group. Negative effects of structural diversity (tree size diversity) on survival probability were strongest in the mature age group. We suggest that effects of tree size diversity relate to environmental stresses and competition at the stand level while the influence of deciduous basal area larger serves as a measure of competition experienced by individual trees. The significance of mean annual temperature in our models indicates that, under warmer conditions, competition variables (e.g., deciduous basal area larger and tree size diversity) had stronger effects on tree mortality with the magnitude of effects varying between age groups. © 2019 Elsevier B.V.
英文关键词	Climate; Intraspecific competition; Stand structure (Tree size diversity); Survival probability; Tree core analysis; Tree size (DBH); Trembling aspen (Populus tremuloides Michx.)
语种	英语
scopus关键词	Probability; Climate; Intraspecific competition; Populus tremuloides; Survival probabilities; Tree size; Tree-size diversity; Forestry; age determination; age structure; basal area; biological development; canopy architecture; climate change; deciduous tree; diameter; environmental stress; intraspecific competition; resource use; stand structure; survival; understory; Age; Competition; Forestry; Populus Tremuloides; Probability; Survival; Trees; Alberta; Canada; Populus; Populus tremuloides
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156110
作者单位	Department of Renewable Resources, University of Alberta, 751 General Services Building, Edmonton, AB T6G 2H1, Canada
推荐引用方式 GB/T 7714	Kweon D.,Comeau P.G.. Relationships between tree survival, stand structure and age in trembling aspen dominated stands[J],2019,438.
APA	Kweon D.,&Comeau P.G..(2019).Relationships between tree survival, stand structure and age in trembling aspen dominated stands.Forest Ecology and Management,438.
MLA	Kweon D.,et al."Relationships between tree survival, stand structure and age in trembling aspen dominated stands".Forest Ecology and Management 438(2019).