Modeling of the Spatial Distribution of Forests in the Southern Part of the Western Sayan
N.B. Ermakov, K.S. Alsynbaev
Abstract
Syntaxonomic diversity of the forests and their spatial arrangement was studied in the Southern part of the Western Sayan. All types of boreal, hemiboreal forest and subalpine forests were attributed to 5 classes, 7 orders, 7 alliances, 24 associations, 3 subassociations, 12 varians. New units are: Order Ledo palustris-Laricetalia cajanderi Ermakov ord. nova hoc loco (nom. type - the all. Ledo palustris-Laricion cajanderi), diagnostic species: Ledum palustre, Vaccinium uliginosum, Empetrum nigrum, Aulacomnium palustre, Polytrichum commune, Carex globularis, Carex pallida, Sphagnum girgensohnii, Sph. warnstorfii, Sph. fuscum, Tomentypnum nitens. Alliance Ledo palustris-Laricion cajanderi Ermakov all. nova hoc loco (nom. type - the ass. (Ledo palustris-Laricetum cajanderi Ermakov, Cherosov, Gogoleva, 2002), diagnostic species: Calamagrostis lapponica, Duschekia fruticosa, Equisetum pratense, Polytrichum jensenii, Salix myrtilloides, Arctagrostis latifolia, Pedicularis labradorica. Alliance Pino sibiricae-Laricion sibiricae Ermakov all. nova hoc loco (nom. type - the ass. Carici iljinii-Laricetum sibiricae), diagnostic species: Pinus sibirica, Calamagrostis obtusata, Poa sibirica, Carex iljinii, Luzula parviflora). Association Carici iljinii-Laricetum sibiricae Ermakov ass. nova hoc loco (diagnostic species are the same as for Pino sibiricae-Laricion sibiricae. 34 syntaxa of the lower rank (associations and subassociations) were organized into spatial units - series and micro-combinations. The relations of distribution of forest types with the limiting ecological and topographic factors (altitude and exposition of mountain slopes) were revealed using DCA ordination. On the basis modeling of the relief (scale of 1 : 200
|
