英文關鍵字
attacked
bark
beech
beetle
calamity
caused
chop
civilization
cut
cycle
czech
down
ecological
economic
environment
europe
european
forests
global
human
infested
insects
interactions
ips
larva
larvae
logging
non
original
pest
phloem
pine
planting
pupa
republic
salvage
scolytinae
small
spruce
stands
stump
tree
typographus
union
warming