National gene conservation unit number: 60110013
Date of collection of the field data entered: 1998
Date of the most recent visit: 2021

Location

Unit country: Latvia
Unit province or state: -
Unit department or county: Jelgavas novads
Unit municipality: Sesavas pagasts
Unit local name: Svirlauka osis
Ownership of the unit: Public
Unit elevation [m a.s.l.]: 33 - 33
Unit surface area [ha]: 267.01
Coordinates (Public coordinates): Latitude (Decimal):56.4069 | Longitude (Decimal): 23.7825

Soil: Gleyic Luvisols

Climate

Mean monthly temperature and mean monthly precipitation²

Climatic zone: Boreal / Alpine.
Environmental zone:Cold and mesic.
Aridity index: 1.011

Species

All tree species reported in the unit: Alnus glutinosa; Alnus incana; Betula pendula; Fraxinus excelsior; Picea abies; Populus tremula
Target species for conservation in the GCU: Fraxinus excelsior

Unit type: Gene reserve forest, Protective forest area, Managed forest area

Target species: Fraxinus excelsior
Status of the target species in the GCU: Included
Category of the target species in the GCU: In situ
Origin of the target species in the GCU : Autochthonous
Population share (%): 98%
Estimated number of reproducing trees (interval): 501 - 5000
Status of long-term viable regeneration: Required management intervention

Management
Population management: Conservation through active intervention carried out
Predominant silvicultural system: Clear-cutting with natural regeneration