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| 1 | C:N:P stoichiometry of Ericaceae species in shrubland biomes across Southern China:influences of climate,soil and species identity显示文摘Aims Carbon(C),nitrogen(N)and phosphorus(P)stoichiometry strongly affect functions and nutrient cycling within ecosystems.However,the related researches in shrubs were very limited.In this study,we aimed to inves-tigate leaf stoichiometry and its driving factors in shrubs,and whether stoichiometry significantly differs among closely related species.Methods We analyzed leaf C,N and P concentrations and their ratios in 32 species of Ericaceae from 161 sites across southern China.We examined the relationships of leaf stoichiometry with environmen-tal variables using linear regressions,and quantified the interactive and independent effects of climate,soil and species on foliar stoi-chiometry using general linear models(GLM).Important Findings The foliar C,N and P contents of Ericaceae were 484.66,14.44 and 1.06 mg g−1,respectively.Leaf C,N and P concentrations and their ratios in Ericaceae were significantly related with latitude and altitude,except the N:P insignificantly correlated with latitude.Climate(mean annual temperature and precipitation)and soil properties(soil C,N and P and bulk density)were significantly influenced element stoichiom-etry.The GLM analysis showed that soil exerted a greater direct effect on leaf stoichiometry than climate did,and climate affected leaf traits mainly via indirect ways.Further,soil properties had stronger influ-ences on leaf P than on leaf C and N.Among all independent factors examined,we found species accounted for the largest proportion of the variation in foliar stoichiometry.These results suggest that species can largely influence foliar stoichiometry,even at a lower taxonomic level. | Qiang Zhang Qing Liu Huajun Yin Chunzhang Zhao Lin Zhang Guoying Zhou Chunying Yin Zhijun Lu Gaoming Xiong Yuelin Li Jiaxiang Li Wenting Xu Zhiyao Tang Zongqiang Xie | 2019 | Journal of Plant Ecology2019，12，2： | 4 |
| 2 | Distribution of shrublands in relation to soil and climate in mid-subtropical China显示文摘Aims Understanding relationships between vegetation and environments is of importance for ecosystem restoration and management.However,information on how environments influence the floristic patterns of shrublands is lack,especially in the subtropical China.In this study,we explored how environments regulate species composition of shrublands at landscape scale in mid-subtropical China.Methods We investigated species composition and measured the climate and soil environments for 207 shrubland plots in mid-subtropical China(24°39′-30°08′N,108°47′-114°15′E).We applied a hierarchical cluster analysis and indicator species analysis based on the Bray-Curtis similarity index to identify the main shrubland types and employed principal coordinate analysis(PCoA)to explore the relationship between floristic composition and environment.Important Findings We identified four shrubland types occurring in different environmental conditions.Montane shrubland,dominated by species suitable for cool climates(e.g.Rhododendron simsii),were distributed in steep areas at comparatively high altitudes;foothill shrubland,dominated by mesophilous species(e.g.Loropetalum chinense),were distributed in low mountains and hills;pioneer shrubland,dominated by fast grow and short-life cycles species(e.g.Rhus chinensis),were distributed at low altitudes with dense population;and finally,limestone shrubland,dominated by calcicole plants(e.g.Coriaria nepalensis),were distributed in the extensive karst areas.Communities occurring in high pH soils were completely separated from those in low pH soils according to the hierarchical cluster analysis.PCoA ordination associated the four types with distinct edaphic and climatic gradients.Soil pH explained 63.3%of variation in PCoA,followed by soil depth and soil bulk density. | Jiaxiang Li Gaoming Xiong Wenting Xu Zongqiang Xie | 2016 | Journal of Plant Ecology2016，9，4： | 1 |
| 3 | Strong restrictions on the trait range of co-occurring species in the newly created riparian zone of the three Gorges Reservoir Area, china显示文摘Aims community assembly links plant traits to particular environmental conditions.Numerous studies have adopted a trait-based approach to understand both community assembly processes and changes in plant functional traits along environmental gradients.In most cases these are long-established,natural or semi-natural environments.However,increasingly human activity has created,and continues to create,a range of new environmental conditions,and under-standing community assembly in these‘novel environments’will be increasingly important.Methods Built in 2006,the three Gorges Dam,largest hydraulic project in china,created a new riparian area of 384 km^(2),with massively al-tered hydrology.this large,newly created ecosystem is an ideal platform for understanding community assembly in a novel environment.We sampled environment variables and plant communities within 103 plots located in both the reservoir riparian zone(RRZ)and adjacent non-flooded and semi-natural upland(Upland)at the three Gorges Reservoir Area.We measured six traits from 168 plant species in order to calculate community-level distribution of trait values.We expected that the altered hydrology in RRZ would have a profound effect on the community assembly process for the local plants.Important Findingsconsistent with previous work on community assembly,the dis-tribution of trait values(range,variance,kurtosis and the standard deviation of the distribution neighbor distances)within all plots was significantly lower than those from random distributions,indicat-ing that both habitat filtering and limiting similarity simultaneously shaped the distributions of traits and the assembly of plant commu-nities.considering the newly created RRZ relative to nearby sites,community assembly was different in two main ways.First,there was a large shift in the mean trait values.compared to Upland commu-nities,plant communities in the RRZ had higher mean specific leaf area(SLA),higher nitrogen per unit leaf mass(Nmass),and lower max-imum height(MH).Second,in the RRZ compared to the Upland,for the percentage of individual plots whose characteristic of trait values was lower than null distributions,the reductions in the community-level range for SLA,Nmass,nitrogen per unit leaf area(Narea)and phos-phorus per unit leaf area(Parea)were much larger,suggesting that the habitat filter in this newly created riparian zone was much stronger compared to longer established semi-natural upland vegetation.this stronger filter,and the restriction to a subset of plants with very similar trait values,has implications for predicting riparian ecosystems’responses to the hydrological alterations and further understanding for human’s effect on plant diversity and plant floras. | Aiying Zhang Will Cornwell Zhaojia Li Gaoming Xiong Dayong Fan Zongqiang Xie | 2019 | Journal of Plant Ecology2019，12，5： | 0 |
| 4 | Structures and topographical pattern of the tree layer of Fagus engleriana-Cyclobalanopsis oxyodon community in Shennongjia area, Hubei Province, China显示文摘Shennongjia represents an area of considerable plant biodiversity,not only for China but for the whole world.The numerous species are distributed along an altitude gradient.The genus Fagus,commonly known as Beeches,constitutes one of the dominant woody species of the humid temperate forests in China.This paper deals with the community structure of a mixed,broadleaved deciduous-evergreen beech forest dominated by the Fagus engleriana and Cyclobalanopsis oxyodon,which occurs along an altitude gradient range in this area.The community consists of 46 woody species,belonging to 22 families and 27 genera.The tree layer can be divided into three sub-strata.The upper layer is composed of deciduous trees,80.7%of which is F.engleriana.The second and third layers are dominated by the evergreen species,such as C.oxyodon and the Rhododendron hypoglaucum.These species increase from 55.9%in the second layer to 80.5%in the third,and regeneration at that rate allows us to assume that the stability of the community may be guaranteed.The micro-site heterogeneity plays an important role in maintaining species diversity in plant communities.In this research,a terrain surface of 0.96hm 2 was simulated using the digital elevation model(DEM)in order to analyze the influence of the topography on plant community structures on a small scale.The slope relief aspect obtained with the DEM showed an accentuated heterogeneity.Semivariance analysis was used to measure the heterogeneity scale.The range and nugget variance of the semivariograms for slope were 285.8 and 280.5,respectively;for aspect,were 21.8 and 498,respectively.The elevated value of the nugget variance suggested that even on a small scale,the topographic variations influenced the species distribution.Twenty-four species were selected to estimate the correlation coefficient between the slope,aspect,and orientation.Then based on the correlation results using the Square Euclidean Distance cluster analysis,the 24 species were divided into four groups. | Mi ZHANG Zongqiang XIE Gaoming XIONG Dayong FAN | 2009 | Frontiers in Biology2009，4，4： | 0 |
| 5 | The Janzen-Connell effect on the population dynamics of a Fagus engleriana- Cyclobalanopsis oxyodon community in a subtropical zone of China显示文摘The Janzen-Connell(J-C)hypothesis provides a mechanism explaining the high species diversity in tropical rainforests.It postulates that predation could cause greater mortality on seeds and seedlings near their parental trees.In this study,we tested the hypothesis in a subtropical zone,a mixed evergreen-deciduous broad-leaved forest dominated by the Fagus engleriana and Cyclobalanopsis oxyodon.The study area was in the Shennongjia region,a key area of biodiversity conserva-tion in both China and the world.The recruitment probability index was used to detect the J-C effect on nine species of the community,which were more than 50 individuals.Six large adults of each species were selected,and the numbers of saplings and adults were counted at the distance intervals of 0–5,5–10,10–15,15–20,and 20–25m from each focal tree.Two species in saplings stage and six in adult stage supported the J-C hypothesis,but theirχ2 was not significant.Three species,the F.engleri-ana,Rhododendron hypoglaucum,and Toona sinensis,showed a strong Hubbell pattern in the adult stage.Because of these results,we reject the J-C hypothesis and conclude that species could recruit near the conspecific trees in subtropical forest.The reasons why the J-C hypothesis fails to explain the species diversity in this community are the shortage of seed-consuming agents of subtropical forest and the influence of microsite topo-graphic variation. | Mi ZHANG Gaoming XIONG Zhigang CHEN Zongqiang XIE | 2009 | Frontiers in Biology2009，4，4： | 0 |
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