Over het voorkomen en de verspreiding van Carex trinervis Degl. op het voormalige landgoed „Berkenheuvel” c.a. bij Diever in Drente

In 1953 Carex trinervis was first discovered on the estate ”Berkenheuvel”, near Diever in the province of Drente, but in 1970 and 1971 more than 150 locations were recorded (see distribution map). Carex trinervis occurs here mainly in an area of fairly high driftsand where Pinus sylvestris grows naturally or was planted. The species is also found under other non-indigenous coniferous plantings of Pinus nigra nigra, Pinus nigra laricio, Picea abies, and Larix leptolepis, as well as under the local deciduous trees Quercus robur and Betula pubescens. Formerly the species grew here in a rather open driftsand area. Most of the planted coniferous forests date from after 1900. Carex trinervis is now often found growing together with Empetrum nigrum, the latter having greatly increased since afforestation.