National gene conservation unit number: NL.SI.5.3.09-01; NL.SI.5.3.09-02
Date of collection of the field data entered: 2025
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
All tree species reported 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: Alnus glutinosa
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 (%): 10%
Estimated number of reproducing trees (interval): 51 - 500
Status of long-term viable regeneration: Sporadic
Management
Population management: Minimum intervention allowed
Predominant silvicultural system: No silviculture
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
Location
