oak trees, quercus robur, autumn in moors of nature reserve takkenhoogte in reest valley, drenthe, netherlands

acid autumn birch bog caerulea deposition deserted drenthe dutch environment europe european fall fen grass group heath heather heathland holland landscape molinia moor moorgrass moorland nature netherlands nitrogen nobody oak oaks peat peatland people pond pool puddle quercus quiet reest reestdal reserve robur soil trees valley water zuidwolde