National gene conservation unit number: NL.SI.5.2.15-01
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: Katwijk
Unit local name: Katwijk aan Zee; Koepelduin
Ownership of the unit: Public
Unit elevation [m a.s.l.]: 15 - 15
Unit surface area [ha]: 15.5
Coordinates (Public coordinates): Latitude (Decimal):52.1941 | Longitude (Decimal): 4.4044

Soil: Calcaric Regosols

Climate

Mean monthly temperature and mean monthly precipitation²

Climatic zone: Cool temperate.
Environmental zone:Cool temperate and moist.
Aridity index: 1.863

Species

All tree species reported in the unit: Hippophae rhamnoides
Target species for conservation in the GCU: Hippophae rhamnoides

Unit type: Seed stand

Target species: Hippophae rhamnoides
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 (%): 70%
Estimated number of reproducing trees (interval): 51 - 500
Status of long-term viable regeneration: Continuous

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