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Spatial heterogeneity of plant species on the windward slope of active sand dunes in a semi-arid region of China

Journal of Arid Land 2013年第1期5卷 80-88页

作者： DeMing JIANG ChunPing MIAO XueHua LI XiaoLan LI ALAMUSA QuanLai ZHOU Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Xinjiang Academy of Agricultural and Reclamation Sciences Shihezi 832000 China

species richness and abundance are two important species diversity variables that have attracted particular attention because of their significance in determining present and future species composition conditions. This paper aims to explain the qualitative and quantitative relationships between species diversity pattern and grain size （i.e. size of the sampling unit）, and species diversity pattern and sampling area, and to analyze species diversity variability on active sand dunes in the Horqin Sandy Land, northeastern Inner Mongolia, China. A 50 mx50 m sampling plot was selected on the windward slope, where the dominant species was annual herb Agriophyllum squarrosum. species composition and abundance at five grain sizes were recorded, and the species-area curves were produced for thirteen grain sizes. The range of values for species abundance tended to increase with in- creasing grain size in the study area, whereas, generally, species richness did not follow this rule because of poor species richness on the windward slope of active sand dunes. However, the homogeneity of species richness in- creased significantly. With the increase in sampling area, species abundance increased linearly, but richness in- creased logarithmically. Furthermore, variograms showed that species diversity on the windward slope of active sand dunes was weakly anisotropic and the distribution pattern was random, according to the Moran Coefficient. The results also showed that species richness was low, with a random distribution pattern. This conflicts with the results of previous studies that showed spatial aggregation in lower richness in a sampling area within a community and inferred that the physical processes play a more important role in species diversity than distribution pattern on active sand dunes. Further research into different diversity patterns and mechanisms between active sand dunes and interdune lowlands should be conducted to better understand biodiversity conservation in

关键词： abundance richness grain size species-area curve variogram Horqin Sandy Land

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The Evolving Role of Botanical Gardens and Natural areas:A Floristic Case Study from Royal Botanical Gardens,Canada

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植物分类与资源学报 2011年第1期33卷 123-131页

作者： David A.GALBRAITH Natalie E.IWANYCKI Brechann V.McGOEY Jamie McGREGOR James S.PRINGLE Carl J.ROTHFELS Tyler W.SMITH Royal Botanical Gardens BurlingtonON University of Guelph GuelphON Duke University DurhamNC Eastern Kentucky University RichmondKY

As leaders calling for the conservation of the world's plants,botanical gardens protect plants within living *** also study,manage and restore plants in natural *** Botanical Gardens(Ontario,Canada) has integrated both horticultural and natural heritage in its mission for *** by municipal leaders in the 1920s as a combination of nature sanctuaries and civic gardens,RBG now includes forests,wetlands and other habitats,gardens and built *** RBG is Canada's largest botanical garden on the basis of *** the 1950s RBG began to inventory plant *** checklist of spontaneous vascular plants now exceeds 1 170 species,of which 752 are *** is 37% of Ontario's native vascular plants and 19% of the native vascular flora of *** RBG nature sanctuaries are among the richest locations in Canada for species-level *** examine the history of floristic exploration within RBG and compare plant species-area relationships among protected natural areas in *** comparison supports the contention that the nature sanctuaries,and in particular Cootes Paradise,could be considered an important area for plants in Canada,and relative to the nation's flora,a biodiversity *** fact that a candidate vascular plant hotspot for Canada lies within a major botanical garden presents opportunities for raising public awareness of the importance of plant diversity,as well as focusing attention on the scientific and conservation biology needs of communities and individual species in this area.

关键词： Botanical garden Ontario Natural areas Biodiversity species-area curve species richness

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