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| 1 | Disentangling the effects of topography and space on the distributions of dominant species in a subtropical forest显示文摘Topography and space are two important factors determining plant species assemblages in forest communities.Quantification of the contribution of these two factors in determining species distribution helps us to evaluate their relative importance in determining species assemblages.This study aims to disentangle the effect of topography and space on the distributions of 14 dominant species in a subtropical mixed forest.Spearman correlation analysis and the torustranslation test were used to test the species–habitat associations.Variation partitioning was used to quantify the relative contributions of topography and space at three sampling scales and three life stages.Correlation analyses and torus-translation tests showed species abundance was mostly correlated with topographic wetness index,vertical distance from the channel network and convexity.Variation partitioning showed that pure topography,pure space and spatially structured topography explained about 2.1 %,41.2 % and 13.8 %of the variation in species distributions,respectively.For nine species,total topography fractions peaked in 20 m quadrats.For ten species,the pure space fractions peaked in 50 m quadrats.For many species,the total topography fraction andthe pure space fraction were larger for the most abundant life stages,which reflected the importance of sampling effect.However,some cases did not follow this trend suggesting that the effects of ecological processes such as habitat filtering,density dependence or dispersal limitation may exceed the sampling effects.In conclusion,we found that spatially structured topography and pure space primarily shaped the distribution of dominant tree species.Furthermore,their effects were both scale- and life stage-dependent. | Qinggang Wang Yaozhan Xu Zhijun Lu Dachuan Bao Yili Guo Junmeng Lu Kuihan Zhang Haibo Liu Hongjie Meng Xiujuan Qiao Handong Huang Mingxi Jiang | 2014 | Chinese Science Bulletin2014，59，35： | 16 |
| 2 | Effects of topography on structuring species assemblages in a subtropical forest显示文摘Aims Topography has long been recognized as an important factor in shaping species distributions.Many studies revealed that species may show species-habitat associations.However,few studies inves-tigate how species assemblages are associated with local habitats,and it still remains unclear how the community-habitat associa-tions vary with species abundance class and life stage.In this study,we analyzed the community-habitat associations in a subtropical montane forest.Methods The fully mapped 25-ha(500×500 m)forest plot is located in Badagongshan Nature Reserve in Hunan Province,Central China.It was divided into 625(20×20 m)quadrats.Habitat types were classified by multivariate regression tree analyses that cluster areas with similar species composition according to the topographic characteristics.Indicator species analysis was used to identify the most important species for structuring species assemblages.We also compared the community-habitat associations for two levels of species abundances(i.e.abundant and rare)and three different life stages(i.e.saplings,juveniles and adults),while accounting for sample size effects.Important Findings The Badagongshan plot was divided into five distinct habitat types,which explained 34.7%of the variance in tree species composi-tion.Even with sample size taken into account,community-habi-tat associations for rare species were much weaker than those for abundant species.Also when accounting for sample size,very small differences were found in the variance explained by topography for the three life stages.Indicator species of habitat types were mainly abundant species,and nearly all adult stage indicator species were also indicators in juvenile and sapling stages.Our study manifested that topographical habitat filtering was important in shaping over-all local species compositions.However,habitat filtering was not important in shaping rare species’distributions in this forest.The community-habitat association patterns in this forest were mainly shaped by abundant species.In addition,during the transitions from saplings to juveniles,and from juveniles to adults,the relative importance of habitat filtering was very weak. | Qinggang Wang Ruwan Punchi-Manage Zhijun Lu Scott B.Franklin Zhiheng Wang Yaoqi Li Xiulian Chi Dachuan Bao Yili Guo Junmeng Lu Yaozhan Xu Xiujuan Qiao Mingxi Jiang | 2017 | Journal of Plant Ecology2017，10，3： | 1 |
| 3 | Pattern and drivers of species- genetic diversity correlation in natural forest tree communities across a biodiversity hotspot显示文摘Aims Exploring species-genetic diversity correlation(SGDC)is essential for understanding spatial patterns of diversity and the underlying mechanisms.Until now,latitudinal patterns of species diversity(SD)and genetic diversity(GD)were rarely studied simultaneously.As the freezing-tolerance hypothesis predicts a decrease of SD from low to high latitudes and the central-marginal hypothesis predicts a unimodal pattern of GD along latitude,we hypothesized that SD and GD are uncorrelated.We also tested how climatic and edaphic factors affect the correlation between the two levels of biodiversity.Methods We measured(i)SD(species richness and Simpson’s diversity index)and community dissimilarity of woody plants(63 plots),(ii)GD(al-lelic richness and expected heterozygosity)and genetic differen-tiation of a dominant tree species(Euptelea pleiospermum;678 individuals from 21 populations)using nuclear microsatellite data,and(iii)climatic(annual mean precipitation,annual mean tempera-ture,minimum temperature,maximum temperature,annual rela-tive moisture,solar radiation,photosynthetically active radiation)and edaphic(total C,total N,total P,available P,K,Ca,Mg,Al,Fe,Mn,Ni,Zn,B,Mo,Cu,pH)variables of 21 sites.We conducted both linear and quadratic regression analyses of diversity param-eters against latitude.Relationships between SD and GD were tested using Pearson’s correlation.Pearson’s and Spearman’sρcor-relation coefficients were calculated between diversity parameters and environmental variables.We used stepwise multiple regression analysis to identify the significant environmental predictors of SD and GD.Important Findings We observed no significant correlation between measures of SD and GD.SD decreases with increasing latitude,which can be partly explained by the freezing-tolerance hypothesis,whereas GD pre-sents a unimodal pattern along the latitudinal gradient,which is consistent with the prediction of the central-marginal hypothesis.The contrasting latitudinal patterns of SD and GD indicate that the two levels of biodiversity do not co-vary in space.Based on both correlation analysis and stepwise multiple regression analysis,SD is only related to climatic variables,whereas GD is mainly related to edaphic variables.Our results show that different geographical and environmental factors affect SD and GD,driving the non-significant correlation between the two fundamental levels of biodiversity.Furthermore,a significantly positive correlation was observed be-tween genetic distance and community dissimilarity,both of which were significantly correlated with geographical distance. | Xinzeng Wei Dachuan Bao Hongjie Meng Mingxi Jiang | 2018 | Journal of Plant Ecology2018，11，5： | 0 |
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