Subject
forest decline
121
ecosystem
24
forestry
19
air pollution
15
environmental pollution
9
soil pollution
9
tropics
9
climatic change
8
soil acidity
8
climatology
7
ecology
7
acid rain
6
climatic effect
6
environmental impact
6
forest
6
soil chemistry
6
soil protection
6
climatic impact
5
environmental chemistry
5
global warming
5
ozone
5
pollution control
5
soil microbiology
5
soil science
5
air quality
4
atmospheric deposition
4
environmental balance
4
environmental biology
4
environmental program
4
environmental protection
4
global change
4
immission
4
plant physiology
4
soil biology
4
soil water
4
sustainable use
4
vegetation
4
water pollution
4
acidification
3
air pollution control
3
atmospheric transport
3
biological stress
3
biotope
3
environmental compatibility
3
environmental effect
3
environmental impact assessment
3
environmental monitoring
3
mycorrhiza
3
nitrogen cycle
3
nutrient
3
more ...