4.6 Article

Scale- and taxon-dependent patterns of plant diversity in steppes of Khakassia, South Siberia (Russia)

期刊

BIODIVERSITY AND CONSERVATION
卷 25, 期 12, 页码 2251-2273

出版社

SPRINGER
DOI: 10.1007/s10531-016-1093-y

关键词

Biodiversity; Bryophyte; Environmental factor; Lichen; Species-area relationship; Species richness

资金

  1. Russian Scientific Foundation [14-14-00453]
  2. Russian Science Foundation [14-14-00453] Funding Source: Russian Science Foundation

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The drivers of plant richness at fine spatial scales in steppe ecosystems are still not sufficiently understood. Our main research questions were: (i) How rich in plant species are the natural steppes of Southern Siberia compared to natural and semi-natural grasslands in other regions of the Palaearctic? (ii) What are the main environmental drivers of the diversity patterns in these steppes? (iii) What are the diversity-environment relationships and do they vary between spatial scales and among different taxonomic groups? We sampled the steppe vegetation (vascular plants, bryophytes and lichens) in Khakassia (Russia) with 39 nested-plot series (0.0001-100-m(2) plot size) and 54 additional 10-m(2) quadrats across the regional range of steppe types and measured various environmental variables. We measured beta-diversity using z-values of power-law species-area relationships. GLM analyses were performed to assess the importance of environmental variables as predictors of species richness and z-value. Khakassian steppes showed both high alpha- and beta-diversity. We found significant scale dependence for the z-values, which had their highest values at small spatial scales and then decreased exponentially. Total species richness was controlled predominantly by heat load index, mean annual precipitation, humus content and soil skeleton content. The positive role of soil pH was evident only for vascular plant species richness. Similar to other studies, we found that the importance of environmental factors strongly differed among taxonomic groups and across spatial scales, thus highlighting the need to study more than one taxon and more than one plot size to get a reliable picture.

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