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grondwater
15
groundwater
15
nederland
15
bodemwater
10
drenthe
10
netherlands
10
soil water
10
water quality
10
waterkwaliteit
10
acid deposition
5
acid rain
5
acidity
5
bodemchemie
5
bosbouw
5
bossen
5
chemical analysis
5
chemical composition
5
chemische analyse
5
chemische eigenschappen
5
chemische samenstelling
5
conifer needles
5
coniferen
5
forestry
5
forests
5
humus
5
litter (plant)
5
minerals
5
naalden
5
neerslag
5
precipitation
5
soil chemistry
5
strooisel
5
zure depositie
5
zure regen
5