Subject
ecosystem
forestry
12
climatology
7
pollution control
7
forest decline
6
biotope
2
environmental effect
2
forest
2
plant ecology
2
agriculture
1
botany
1
cartography
1
crop
1
cultivated plant
1
denitrification
1
dynamic model
1
ecology
1
environment
1
geography
1
nature conservation
1
nitrate
1
nitrification
1
nutrient
1
photosynthesis
1
plant growth
1
plant protection
1
soil pollution
1
spruce
1
vegetation
1
wheat
1
wood
1