National gene conservation unit number: NL.SI.5.3.09-01; NL.SI.5.3.09-02
Population number: -

GCU
Date of collection of the field data entered: 2025
Date of the most recent visit: 2025

POPULATION
Year of Establishment of the GCU for the species: 2025
Date (or partial of date) of the most recent visit: 2025

Location

Unit country: Netherlands
Unit province or state: Zuid holland
Unit department or county: -
Unit municipality: Westvoorne
Unit local name: Westvoorne; Quakjeswater
Ownership of the unit: Private
Unit elevation [m a.s.l.]: 5 - 5
Unit surface area [ha]: 6
Coordinates ( Public coordinates): Latitude (Decimal):51.8515 | Longitude (Decimal): 4.0744

Soil: Calcaric Fluvisols

Climate

Mean monthly temperature and mean monthly precipitation²

Climatic zone: Cool temperate.
Environmental zone:Cool temperate and moist.
Aridity index: 1.494

Species

All tree species growing in the unit: Alnus glutinosa; Berberis vulgaris; Cornus sanguinea; Crataegus monogyna; Hippophae rhamnoides; Lonicera periclymenum; Quercus robur; Rhamnus cathartica; Viburnum opulus
Target species for conservation in the GCU: Alnus glutinosa, Rhamnus cathartica

Unit type: Seed stand

Target species: Rhamnus cathartica
Status of the target species in the GCU: -
Category of the target species in the GCU: In situ
Origin of the target species in the GCU : Autochthonous
Population share (%): 100%
Estimated number of reproducing trees (interval): 501 - 5000
Status of long-term viable regeneration: Continuous

Management
Population management: Minimum intervention allowed
Predominant silvicultural system: No silviculture