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The role of glacial gravel in community development of vascular plants on the glacier forelands of the Third Pole

Journal of Arid Land 2022年第9期14卷 1022-1037页

作者： WEI Tianfeng SHANGGUAN Donghui TANG Xianglong QIN Yu School of Architecture and Urban Planning Lanzhou Jiaotong UniversityLanzhou 730070China State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China China-Pakistan Joint Research Center on Earth Sciences Chinese Academy of Sciences and Higher Education Commission PakistanIslamabad 45320Pakistan

On a deglaciated terrain,glacial gravel is the primary component of the natural habitat for vascular plant colonization and *** regarding the role of glacial gravel in vascular plant growth,however,remains *** this study,an unmanned aerial vehicle(UAV)was used to investigate plant family composition,species richness,fractional vegetation cover(FVC),and gravel cover(GC)along elevational gradients on the three glacier forelands(Kekesayi,Jiangmanjiaer,and Koxkar Baxi)of the Third Pole(including the eastern Pamir Plateau and western Tianshan Mountains)in *** then analyzed the spatial characteristics of vascular plants followed by exploring the effect of glacial gravel on vascular *** indicated that FVC on these glacier forelands generally decreased as the elevation increased or distance from the current glacier terminus *** shady slope(Kekesayi)was more vegetated in comparison to the sunny slope(Jiangmanjiaer)at the glacier basin scale,and the warm and humid deglaciated terrain(Koxkar Baxi)had the highest FVC at the regional *** family composition and species richness on the glacier forelands decreased with rising elevation,with the exception of those on the Jiangmanjiaer glacier *** relationships between FVC and GC presented negative correlations;particularly,they exhibited variations in power functions on the Kekesayi and Jiangmanjiaer glacier forelands of the eastern Pamir Plateau and a linear function on the Koxkar Baxi glacier foreland of the western Tianshan *** gravel was found to be conducive to vegetation colonization and development in the early succession stage up until vascular plants adapted to the cold and arid climatic condition,whereas it is unfavorable to the expansion of vascular plants in the later succession *** findings suggested that the spatial difference of plant characteristics had close connections with regional climatic and topographic conditions,as well

关键词： vascular plants fractional vegetation cover glacial gravel glacier foreland unmanned aerial vehicle Pamir Plateau Tianshan Mountains

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***2:An updated and enlarged R package that can generate very large phylogenies for vascular plants

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Plant Diversity 2022年第4期44卷 335-339页

作者： Yi Jin Hong Qian Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Karst Mountainous Areas of Southwestern China Guizhou Normal UniversityGuiyang550025China Research and Collections Center Illinois State Museum1011 East Ash StreetSpringfieldIL62703USA

An earlier version of *** has been broadly used to generate phylogenetic trees of vascular plants for botanical,biogeographical and ecological ***,we update and enlarge this package,which is now called‘***2’.With ***2,one can generate a phylogenetic tree for vascular plants based on one of three different botanical nomenclature ***2 can generate phylogenies for very large species lists(the largest species list that we tested included 365,198 species).***2 generates phylogenies at a fast *** provide an example(including a sample species list and an R script to run it)in this paper to show how to use ***2 to generate phylogenetic trees.

关键词： Community phylogenetics Global plants Phylogeny Species list vascular plants V.PhyloMaker

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Latitudinal trends in genus richness of vascular plants in the Eocene and Oligocene of North America

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Plant Diversity 2016年第3期38卷 133-141页

作者： AJ.Harris Cassondra Walker Justin R.Dee Michael W.Palmer Smithsonian Institution Department of BotanyNational Museum of Natural History Oklahoma State University Integrative Biology501 Life Sciences West Oklahoma State University Botany301 Physical Sciences Oklahoma State University Plant BiologyEcologyand Evolution301 Physical Sciences

The latitudinal richness gradient is a frequent topic of study on the modern landscape,but its history in deep time is much less well ***,we preliminarily evaluated the paleolatitudinal richness gradient of vascular plants for the Eocene(56-33.9 million years ago) and Oligocene(33.9-23 million years ago) epochs of North America north of IVlexico using 201 fossil *** calculated the direction and shape of the gradient using quadratic regression to detect linear and curvilinear *** performed regressions for the Eocene and Oligocene as well as for informal time intervals within the Eocene:early,middle,and middle + *** found that quadratic models better explain the data than linear models for both epochs as well as for the early Eocene.A roughly linear trend in the middle and middle + late intervals may reflect limited sampling of high latitude floras for those *** curvilinear relationship was weak for the Eocene and the model showed a peak in richness at 45.5°*** curvilinear relationship was much stronger for the Oligocene and the peak occurred at 48.5°*** the Eocene,the mid-latitude peak in richness may be explained by mean annual temperature,which was probably higher at some mid-latitudes than at lower *** the Oligocene,the peak in richness at midlatitudes may be explained by evolutionary diversification within the temperate zone or by increased aridity at low *** also assessed the latitudinal richness gradient of genera within modern floras in North America north of Mexico and we found a weak,curvilinear trend with a peak in richness at 31.5°*** results suggest that the latitudinal genus richness gradient of vascular plants in North America continued to develop into its modern structure following the Oligocene.

关键词： Eocene Genus richness North America Oligocene Paleolatitude vascular plants

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Alterations to biological soil crusts with alpine meadow retrogressive succession affect seeds germination of three plant species

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Journal of Mountain Science 2016年第11期13卷 1995-2005页

作者： LI Yi-kang OUYANG Jing-zheng LIN Li XU Xing-liang ZHANG Fa-wei DU Yan-gong LIU Shu-li CAO Guang-min HAN Fa Key Laboratory of Adaptation and Evolution of Plateau Biota Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810001China University of Chinese Academy of Sciences Beijing 100049China Institute of Geographic Sciences&Natural Resources Research the Chinese Academy of SciencesBeijing 100101China Liancheng National Nature Reserve of Gansu Province Yongdeng Country 730000China

Biological soil crusts(BSCs) are the important components of alpine meadow *** extent and morphology of BSCs vary greatly with alpine meadow retrogressive succession due to grazing *** is significant interest in impacts of crust composition on plant seed germination,especial l y in(semi-) arid ***,little is known about the influences of BSCs,and their associations with alpine meadow succession,on germination of typical alpine meadow vascular plant *** a full factorial common-gardenexperiment,we studied effects of:(1) crust type,(2) seed position,and(3) surface texture on seed *** chose three typical alpine meadow plant species(*** pratensis,Tibetia himalaica and Potentillen nivea),which belonged to different functional groups(graminoids,legumes,and forbs) and play important roles in all alpine meadow succession *** type and seed position influenced seed germination,and the inhibitory effects of BSCs depended on the crust type and seed species *** major factors influencing seed germination were BSC type,seed position,soil texture,and the interactions between BSC type and seed position; species and seed position; species andsurface texture; and species,crust type,and surface *** crust significantly inhibited germination of all *** position also had a significant effect on seed germination(p < 0.001).Fewer seedlings germinated on the surface than below the surface,this was especially true for *** within cyanobacteria and lichen *** germination rates of *** on the soil surface were significantly correlated with plant occurrence frequency within the alpine meadow *** poor correlation for the other two species is possibly that they are *** results clearly demonstrated that BSCs can be biological filters during seed germination,depending on the BSC succession *** their influences on seed germination,BSCs can strongly

关键词： Crust type Seed position Microenvironment Germination Tibetan Plateau vascular plants

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An updated megaphylogeny of plants,a tool for generating plant phylogenies and an analysis of phylogenetic community structure

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Journal of Plant Ecology 2016年第2期9卷 233-239页

作者： Hong Qian Yi Jin Research and Collections Center Illinois State Museum1011 East Ash StreetSpringfieldIL 62703USA College of Life Sciences Zhejiang UniversityHangzhou 310058China

Aims The aim of this article is ***,we present an updated version of a published megaphylogeny of vascular plants that can be used in studies of plant ecology and ***,we develop a tool that can be used by botanists and plant ecologists to generate phylogenetic hypotheses in three ***,we use a set of regional assemblages of angiosperm trees in North america as a model system to evaluate the effect of differences in phylogenies generated using the three scenarios on the quantification of phylogenetic properties and the relationship between measures of phylogenetic properties and *** The taxonomy and nomenclature of plant species in the megaphy-logeny were standardized according to The Plant list(version 1.1).a tool for generating phylogenies was created using the r *** robustness of derived phylogenies was evaluated using correlation and regression *** Findingsan updated megaphylogeny of vascular plants(PhytoPhylo)and a tool for reconstructing phylogenies of seed plants(***)were *** study shows that phylogenies generated by *** using the PhytoPhylo megaphylogeny as a backbone are nearly as good as phylogeny resolved at the species level when using derived phylogenies to quantify phylogenetic properties(*** diversity and phylogenetic relatedness)of biological assemblages,and that ***-generated phylogenies are robust for studies of community ecology and biogeography,par-ticularly those seeking for patterns of phylogenetic properties along environmental gradients.

关键词： megatree megaphylogeny phylogenetic community ecology phylogenetic metrics phylogenetic tree supertree vascular plants

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Spatial Pattern of Plant Specimen and Its Implications in Conservation Biology in Hengduan Mountains of Southwest China

Spatial Pattern of Plant Specimen and Its Implications in Co...

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Computer and Computing Technologies in Agriculture V——5th IFIP TC 5/SIG 5.1 Conference(CCTA2011) Part II

作者： Hanming He Jianmeng Feng Key Lab.of the Ministry of Education for Agro-Biodiversity and Pest Control Yunnan Agricultural University Department of Life Science and Chemistry Dali University

In the past,the spatial patterns of specimen have not been paid enough *** this study,we probed the spatial pattern of plant specimen and its implications in conservation biology in Hengduan Mountains,one of the hotspots of global biodiversity,based on the dataset extracted from Chinese Virtual *** results showed that there were big differences of specimen density among the units of the studied *** specimen density was mainly found in the boundary regions of Northwest Yunnan,Southwest Sichuan and Southeast Tibet,the central part and the southern part of the studied *** interest of the collectors or botanists was mainly focused on the units with low population density(low disturbance of human activity)and high complexity of *** the increase of specimen density,an increasing trend of species density was *** of the units studied were not paid enough attention in the history of specimen *** we collected specimen at higher density in blank or marginalized area,we may have much more chances to find more *** spatial pattern of specimen density may shape our understanding of the spatial pattern of specie *** should not only inherit specimen from our predecessors,but also,we should probe into specimen repositories to understand biodiversity status and its spatial pattern.

关键词： Altitudinal difference against area Hengduan mountains Population density Spatial pattern Specimen density Species density vascular plants

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