The growth and photosynthetic characteristics of Populus deltoides Bartr.
cv.Lux (ex.Ⅰ-69/55) and P.×euramericana (Dode) Guinier cv.Ⅰ-214,
which are clones of the tribe Algeiros;and P.×Opera Hsü and P.×popularis
Hsü which are hybrids of P.Simonii,were studied under the controlled
condition both in greenhouse and field during 1979—1981.Special attention
was paid to determine their diurnal and seasonal changes of net photosynth-
etic rates and other related phot...