Subject
ecology
agriculture
7
agricultural use
4
forest
3
biotope
2
forestry
2
landscape
2
soil biology
2
wood
2
anatomy
1
climatic change
1
ecosystem
1
environment
1
environmental effect
1
environmental pollution
1
forest decline
1
genetics
1
global change
1
insect
1
nature conservation
1
nitrogen
1
nitrogen fixation
1
pest
1
photosynthesis
1
phytopathology
1
plant ecology
1
plant growth
1
population
1
regional geology
1
soil chemistry
1
soil protection
1
sustainable use
1
tree
1