Provenance variation among different populations of oaks from China and Japan.

分别从个体、林分和地理水平上对东北地区蒙古栎各器官的形态变异进行了研究。此外，某些器官形态的频率分布呈极不规则的曲线形或变异较大，有些器官的形态在蒙古栎与其它栎属树种间连续变异，因此，蒙古栎与其它栎属树种自然杂交的可能性与蒙古栎相同。grosseserrata与其他栎属物种在北海道，日本。

The morphological variation of various organs of Q.mongolica trees in the Northeast of China were recognized at individual, stand and geographical level, respectively. Besides the frequency distribution of certain organs' morphology showed very irregular shaped curves or the great variety, and shapes of some of those varied successively between Q.mongolica and other oak species.Consequently the probability is supposed that Q.mongolica crosses with other oaks naturally in this region, as same as Q.mongolica var. grosseserrata with other Quercus species in Hokkaido, Japan.