The shade endurance of Pteroceltis tatarinowii was studied by comparison ofthe
physiological property and the crown structure of different tree species. Results showedthat the
older the age of the plant was, the weaker the shade endurance of it was.While theplant was
shade tolerant under 12 years of age, it becanie heliophilous from the 13th year tothe 25th
year, and was a sun tree after 26 years of age. Generally, the shade endurance ofP. tatarinewii
was st...