Table 1. Description of experimental trees
Group
NOTC
OTC-I
OTC-II
OTC-III
Chamber installation
X
O
O
O
CO
2
level
≈ 400 ppm
≈ 400 ppm
560 ppm
720 ppm
Number of trees
3
3
3
3
Tree species
Pinus densiflora
Siebold & Zucc.
NOTC: external control, OTC: open-top chamber.