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spatial patterns of Picea crassifolia driven by environmental heterogeneity and intraspecifi c interactions

Journal of Forestry Research 2023年第4期34卷 949-962页

作者： Changxing Zhao Weijun Zhao Ming Jin Jiqiang Zhou Feng Ta Lei Wang Wenbo Mou Longju Lei Jinrong Liu Junlin Du Xinglin Zhang State Key Laboratory of Grassland Agro-Ecosystems College of Pastoral Agriculture Scienceand TechnologyLanzhou UniversityLanzhou 730000People’s Republic of China Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province Zhangye 734000People’s Republic of China Gansu Nonferrous Engineering Survey Design and Research InstituteLanzhou 730000People’s Republic of China State Key Laboratory of Grassland Agro-Ecosystems School of Life ScienceLanzhou UniversityLanzhou 730000People’s Republic of China Hexi University Zhangye 734000People’s Republic of China Gansu Academy of Eco-Environmental Sciences Lanzhou 730030People’s Republic of China

Research on the spatial patterns of tree populations is critical for understanding the structure and dynamic processes of ***,little is known about how the underlying drivers shape these patterns and species interactions in forest *** this study,spatial point pattern analysis investigated the combined eff ects of intraspecifi c interactions and environmental heterogeneity on the spatial structure and internal maintenance mechanisms of Picea crassifolia in the Qilian Mountain National Nature Reserve,*** were obtained from a 10.2-ha dynamic monitoring plot(DMP)and sixteen 0.04-ha elevation gradient plots(EGPs).Under complete spatial randomness,both mature trees and saplings in the DMP demonstratedlarge-scale aggregation with negative *** EGPs,saplings were clustered in small mesoscales,mature trees were randomly distributed,and the interactions of saplingstrees at all elevations were not *** eliminating the interference of environmental heterogeneity through the inhomogeneous Poisson process,saplings in the DMP and EGPs were clustered in small scales and trees randomly *** c associations were negatively correlated,in the DMP and at low elevations,and no correlations in high elevations of *** the vertical scale,saplings showed a small-scale aggregation pattern with increase in elevation,and the aggregation degree fi rst decreased and then *** interactions of saplings-trees and saplings–saplings showed inhibitions at small scales,with the degree of inhibition gradually *** patterns and associations of adults–adults did not change *** results revealed that intraspecifi c interactions and environmental heterogeneity regulated the spatial patterns of *** at small and large scales,*** heterogeneity might be the most decisive factor aff ecting the spatial patterns of saplings,while trees were more aff ected by intraspecifi c intera

关键词： Picea crassifolia spatial point pattern analysis Intraspecifi c interactions Environmental heterogeneity

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spatial distributions of tropical tree species in northern Vietnam under environmentally variable site conditions

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Journal of Forestry Research 2014年第2期25卷 257-268页

作者： Nguyen Hong Hai Kerstin Wiegand Stephan Getzin Department of Ecosystem Modelling Faculty of Forest Sciences and Forest EcologyUniversity of Goettingen Faculty of Agricultural Techniques Hatay Community College UFZ Helmholtz Centre for Environmental Research–UFZ Department of Ecological Modeling

Ecological interactions of species and thus their spatial pat- terns may differ between homogeneous and heterogeneous forests. To account for this, techniques of point pattern analysis were implemented on mapped locations of tree individuals from two 1-ha tropicalforest plots in Vietnam. We analyzed the effect of environmental heterogeneity on tree distributions; spatial distribution patterns of dominant species; inter-specific associations; and conspecific associations between life stages. Our analyses showed that： environmental conditions were homo- geneous at plot 1 but heterogeneous at plot 2; in both plots, all six domi- nant species were aggregated at various scales up to 30 m, and tree spe- cies were aggregated at larger scales in the homogeneous site than in the heterogeneous site; attraction between pairs of species was remarkably higher at the homogeneous site while negative associations were more frequent in the heterogeneous site; some species, H. kurzii, T. ilicifolia （homogeneous plot） and D. sylvatica, S. wightianum （heterogeneous plot） showed a lack of early life-stage individuals near conspecific adults. Moreover, additional clustering of young individuals was independent from conspecific adults, except D. sylvatica in both sites. These findings are consistent with the Janzen-ConneU hypothesis. Overall, habitat het- erogeneity influences spatial patterns and inter-specific associations of the tree species and evidences of self-thinning are shown in most species.

关键词： environmental heterogeneity spatial point pattern analysis tropical evergreen forest northern Vietnam.

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Changes in forest structure, species diversity and spatial pattern following hurricane disturbance in a Piedmont North Carolina forest, USA

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Journal of Plant Ecology 2008年第1期1卷 43-57页

作者： Weimin Xi Robert K.Peet Dean L.Urban Department of Biology University of North Carolina at Chapel HillChapel HillNC 29599-3280USA The Nicholas School of the Environment and Earth Sciences Duke UniversityDurhamNC 27708USA

Aims Large hurricanes have profound impacts on temperate forests,but owing to their infrequent nature these effects have rarely been examined in *** 1996,Hurricane Fran significantly damaged many long-term tree census plots in the Duke Forest on the North Carolina Piedmont,thereby providing an exceptional opportunity to examine pre-and post-hurricane forest compositional *** goal was to examine immediate,short-term(0–4 years)and longer term(;5 year)hurricane-induced structural,spatial and compositional changes in the tree population(stem d.b.h>1 cm)in the context of our detailed,long-term knowledge of the dynamics of these *** We surveyed stem damage and tree mortality in 34 long-term permanent plots(ca.70-year record;404–1012 m^(2))and 7 large mapped tree stands(ca.20-year record;5250–65000 m^(2))representing both transition-phase,even-aged pine stands and uneven-aged upland hardwood *** employed three types of damage measures to quantify stand-level damage severity:percentage of stems damaged,percentage of basal area lost and a‘stand-level damage index’.Second-order spatial analysis(Ripley’s K-function)was used to investigate patterns in tree *** findings Our study found hurricane effects on the structural attributes of Piedmont forests to be variable and *** in tree species composition,however,were *** was the major damage type for the overstory trees[diameter at breast height(d.b.h.)>10 cm]apparently due to the exposure of the crowns to high wind combined with heavy rainfall prior to and during the ***,juvenile trees and small trees(1–10 cm d.b.h.)of the understory and midstory were mainly damaged by being pinned or bent by their damaged large ***-induced tree mortality varied weakly among species,was positively correlated with pre-hurricane tree size and remained up to 2-fold higher than pre-hurricane background mortality 5 years after the ***

关键词： delayed tree mortality disturbance ecology hurricane damage d Hurricane Fran spatial point pattern analysis stand dynamics structural heterogeneity

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