Excursies - Higher sandy soils - Drentsche Aa
13 important questions on Excursies - Higher sandy soils - Drentsche Aa
What does the Drenthe plateau consist of and when was this material deposited?
Deposited during the Saale glaciation, which is the one before the last ice age.
What material lays on top of the plateau and when was this deposited?
From the most recent ice age (Weichselian glaciation).
Why is the esdorp landscape of Drenthe characterised by a relatively low density of villages?
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Why are the villages located along the brook vallays?
What happened to the grasslands that were purchased by SBB?
What are the dominant and distictive plants under agricultural management?
2. Broad-leaved dock
Rumex obtusifolius (Ridderzuring)
What are the dominant and distictive plants at sites with 30 years SBB management?
2. Woodrush - Luzula campestris (Gewone veldbies)
3. Broad-leaved marsh orchid
Dactylorhiza majalis ssp majalis (Brede orchis)
4. Sharp-flowered rush - Juncus acutiflorus (Veldrus)
(partitions)
5. Common rush - Juncus effusus (Pitrus)
(filled with marrow)
What does the grazing management (based on Frans Vera's ideas about natural park landscapes) lead to, and what are the ideas behind it?
The ideas behind it are rewilding and a more naturally dynamic landscape.
How were the drifting sands of the Gasteren dunes created?
Where can drifting sands be found?
1. on windblown sand deposits on the plateaus
, but here we also find them in
2. a former brook valley.
What are the differences between an upper course brook valley and a middle course brook valley?
- brook is broader
- brook has more iron
- higher groundwater level (due to high pressure from groundwater, end of keileem, it can escape)
- richer and greener vegetation
What are seepage indicators?
2. Wood club-rush - Scirpus sylvaticus (Bosbies)
3. Marsh marigold - Caltha palustris (Dotterbloem)
What plant species are charactersitic of a brook valley grassland along a middle course?
2. Marsh trefoil - Menyanthes trifoliata (Waterdrieblad)
3. Ragged-Robin - Silene flos-cuculi
(Echte koekoeksbloem)
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