abis: Vegetation and environmental data recorded in a Tundra...

In simba: A Collection of functions for similarity analysis of vegetation data

Description

Vegetation and related data from field sites in a Tundra Ecosystem in Northern Sweden. abis.spec holds abundance information of 158 species on 61 sites.

Usage

  data(abis)

Format

• abis.env contains some environmental variables from the Abisko field sites. These are:

  • X Numeric: The x-coordinates of the field sites (utm). The sites are arranged in a regular equidistant grid. Each site is a hexagon plot with 5m radius.

  • Y Numeric: The y-coordinates of the geographic position of the field sites.

  • alt Integer: Height a.s.l. of the field sites.

  • aspect Exposition of the sites. In degree from 0 to 180/-180. Counts negative in westward direction and positive in eastward direction.

  • slope Numeric: the inclination of the sites in degree

  • pH Numeric: pH value of soil samples taken on the sites (mixed samples from three

  • n.spec Integer: Number of species on the site.

  • shannon Numeric: Shannon index calculated from the species data.

  • even Numeric: Evenness calculated from the species data.

  • simps Numeric: Simpson diversity index for the site.

  • ephwtrs1 Numeric: Cover of ephemeral waters

  • ephwtrs2 Numeric: Cover of dried out ephemeral waters?

  • roughn Numeric: Roughness index for the site. Obtained through calculating the ratio between the length of the straight lines dissecting the hexagonal plot and the lengths of lines along this dissections but exactly following the surface.

  • stones.cov Numeric: Proportion of area of site covered by rocks which are covered with vegetation.

  • stones.uncov Numeric: Proportion of area of site with uncovered, bare rocks.

  • bare.soil Numeric: Open soil (most often sandy substrates).

  • water Numeric: Proportion of area covered by permanent water bodies.

  • bog Numeric: Proportion of area covered with boggy depressions.

  • lemming Numeric: Counts of Lemming feces.

  • elk Numeric: Counts of Elk feces.

  • ren Numeric: Counts of Ren feces.

  • ripa Numeric: Counts of Ripa feces.

  • fox Numeric: Counts of Fox feces.

  • grubbings Numeric: Amount of mole grubbings.

  • tread Numeric: Amount of hoof tread.

  • betula Numeric: Cover of Betula.

  • CEC Numeric: Cation Exchange Capacity measured from the mixed soil sample taken in the field.

  • base.satur Numeric: Base saturation.

  • heath Binary: Does the site belong to the vegetation type 'heath'?

  • shrubs Binary: Does the site belong to the vegetation type 'shrubby vegetation'?

  • protect Binary: Does the site belong to the vegetation type 'protected snow heath'?

Source

Jurasinski G, Jentsch A, Retzer V, Beierkuhnlein C (submitted) Assessing gradients in species composition with multiple plot similarity coefficients. Ecography

Rettenmaier, N. 2004. Räumliche Muster der Biodiversität in der skandinavischen Tundra - Diploma thesis (unpublished), Department of Biogeography, University of Bayreuth, pp. 96.

Examples

data(abis)

simba documentation built on May 1, 2019, 8:49 p.m.