ahti: Vegetation of Lichen-rich Pine Forests in Finland

In jarioksa/twinspan: Two-Way Indicator Species Analysis

Vegetation of Lichen-rich Pine Forests in Finland

Description

Vegetation data set of 170 quadrats and 115 species with visually estimated cover percentage values (Oksanen & Ahti, 1982).

Usage

data("ahti")

Details

The taxon names are given with 4+4 acronyms of the binomial name. The complete scientific names are listed in vignette "ahtinames"; perhaps the easiest way of reading the vignette is to use browseVignettes (but see Examples below). Only understorey plants are included in the current file: trees and shrubs, also as seedlings, are not included, although they are listed in the original article.

Oksanen & Ahti (1982) allocated the quadrats into vegetation classes that they called ‘noda’. The name of quadrat is based on the original nodum followed by the original number of the quadrat. In northern Finland (nortern boreal zone, roughly corresponding to the are of intensive reindeer grazing) five noda were separated: Ster for Stereocaulon, Vuli for Vaccinium uliginosum, Vmyr for Vaccinium myrtillus, Call for Calluna, and Empe for Empetrum. Most Middle boreal, south boreal and hemiboreal stands were allocated into Cetraria islandica nodum, but tabulated separately for young and old forest stands and by vegetation zone: middle boreal (names starting with M) and southern boreal (names starting with S) zones divided into young (Myng, Syng) and old (Mold, Sold) forests. Hemiboreal forests (Hbor) were not divided by age classes. The only separate southern boreal type was Thymus serpyllum nodum (Thym) on the sunny slopes of eskers.

Source

Oksanen & Ahti (1982).

References

Oksanen, J. & Ahti, T. (1982) Lichen-rich pine forest vegetation in Finland. Annales Botanici Fennici 19, 275–301.

Examples

## Read the vignette listing complete scientific names
if (interactive()) {
vignette("ahtinames", package="twinspan")
}

jarioksa/twinspan documentation built on Nov. 23, 2024, 2:49 p.m.