DOI: 10.1016/j.foreco.2016.10.049
Scopus记录号: 2-s2.0-84992679325
论文题名: Relative importance of density dependence and topography on tree mortality in a subtropical mountain forest
作者: Wu H. ; Franklin S.B. ; Liu J. ; Lu Z.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 384 起始页码: 169
结束页码: 179
语种: 英语
英文关键词: Density dependence
; Snags
; Topography
; Tree mortality
; Tree size
Scopus关键词: Dynamics
; Statistical methods
; Surveys
; Topography
; Density dependence
; Generalized linear mixed models
; Inter-specific competitions
; Pair correlation functions
; Snags
; Spatial distribution patterns
; Tree mortality
; Tree size
; Forestry
; basal area
; coexistence
; density dependence
; forest dynamics
; forest ecosystem
; forest management
; interspecific competition
; montane forest
; mortality
; snag
; spatial distribution
; subtropical region
; woody plant
; Badagongshan
; China
; Hunan
英文摘要: Tree mortality is an important process in forest dynamics, and potentially affects species coexistence and community assembly. Detecting spatial pattern of tree mortality and examining the possible driving factors are critical to understand the determinants of tree death. In 2015, we conducted a census of snags (with dbh ⩾ 10 cm) of woody plants in the 25-ha Badagongshan (BDGS) forest dynamics plot. Based on this survey data, we used the univariate, bivariate pair correlation function, g(r), to analyze the spatial distribution pattern of snags and the association between snags and living trees. In addition, we used generalized linear mixed models (GLMM) to examine the relative importance of neighbor and topographical factors on tree mortality. Analyses demonstrated two main results. First, at the community level, snags showed a consistent aggregated distribution at 0–30 m scales, and snags and living trees were significantly negatively correlated at 1–12 m scales. At the species level, 10 of the 18 common species (with ⩾25 snag individuals) displayed significant negative associations between living trees and snags at different scales in the 0–50 m range. Second, both basal area of conspecific neighbors and basal area of heterospecific neighbors showed a significant positive relationship on the occurrence of snags at different levels (community, guild and species). Topographic factors showed limited correlations with the occurrence of snags. Additionally, tree size was significantly negatively correlated with adult and large tree mortality, but non-significantly correlated with old trees. In summary, tree mortality is nonrandom and mainly driven by interspecific competition and intraspecific negative density dependence in this subtropical mountain evergreen and deciduous broad-leaved mixed forest in China. Topographic conditions had little relation on tree mortality, but tree size was an important predictor of tree death at the community level. Our study demonstrates that interactions of species tended to be more important in affecting tree mortality than habitat variables in this forest, which can further improve our understanding of forest dynamics and provide guidance to forest management. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64603
Appears in Collections: 影响、适应和脆弱性
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作者单位: Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, China; Department of Life Science, University of Chinese Academy of Sciences, Beijing, China; School of Biological Sciences, University of Northern Colorado, GreeleyCO, United States
Recommended Citation:
Wu H.,Franklin S.B.,Liu J.,et al. Relative importance of density dependence and topography on tree mortality in a subtropical mountain forest[J]. Forest Ecology and Management,2017-01-01,384