Subject
forestry
ecosystem
12
agriculture
7
climatology
7
forest decline
7
pollution control
7
plant ecology
3
tree
3
wood
3
agronomy
2
developing country
2
ecology
2
economics
2
environmental balance
2
fishery
2
food production
2
forest
2
global change
2
international trade
2
nutrition
2
plant breeding
2
statistics
2
tree growth
2
agroforestry
1
animal
1
carbon dioxide
1
carbon dioxide acceptor process
1
climatic change
1
coal mining
1
contaminated land
1
culture
1
denitrification
1
ecophysiology
1
environment
1
environmental biology
1
environmental effect
1
evaporation
1
herbicide
1
history
1
interaction
1
nature conservation
1
nitrate
1
nitrification
1
nitrogen fixation
1
photosynthesis
1
plant hormone
1
precipitation
1
product
1
research and development
1
sequestration
1
more ...