Thirty poplar clones of either domestic or foreign origin in Aigeiros section were introduced for regional planting test contrasting with I-69 (Populus deltoides ‘Lux’). Twelve experimental plots were planted separately in southwest, south, east, and northwest regions within Shandong Province. Combined variance analysis of multiple experimental sites showed that there were significant differences within sites and clones. The interaction between clone and environment was significant in the southwest region of Shandong Province, while those weren’t in other regions. With a analysis of multiple contrast (Duncan’s method), effective value of clone (C_i), coefficient of variation for interaction effect variance (_iCV) and regression coefficient (b_i), some superior clones with the characteristics of fast growth rate, higher genetic stability and growth adaptability, were screened out for each poplar cultivation region in Shandong Province.
