nature developement and pollard willows in dutch streamvalley of the river aa

afgelaagd aflagen alder beekdal border bordered braam brambles bramen broad brook clear cleared crown cut developement dras dutch els elzen geschoond grass houtwal inzaaien knotbomen knotten knotwilgen left mirror mirroring mowe mowed mowing nature natuurontwikkeling pasture pastyure plas pollard pollarding preparation prepare prepared proper rij river row rows schonen several sky spiegel spiegeling stream streamvalley stretch topped tree treelines trees truncate typical valley wal weiland wilg wilgen willow willows wood years zaad zaaien zaden zode