Why would the pines disappear over time, as they are not typical species of old forests? And which species are taking over?
The Ellenberg values might be useful to answer this question, especially the ones regarding light. These can be found in your reader, and you can compare the values for different species (for example pine and beech). The higher the value for light, the more light a plant needs to survive.

Location 1: Zoomweg – Vegetation 1

Before the forest around you was here, there used to be heather fields that were maintained by the grazing of sheep 🐑. When this grazing stopped, succession could…