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分析了东北地区蒙古栎群落１９２ 个属分布区类型，其中温带分布属占７２ ％ ， 热带分布属占９ ．７ ％ ．也比较了东北地区１０ 个地点和河北省１ 个地点的蒙古栎群落物种所在属的分布区类型， 统计了不同地点属的分布区类型占总属的比例，计算了温带属与热带属（ Ｔ／ Ｒ） 的比值，结果发现蒙古栎群落的温带分布属和Ｔ／Ｒ 值（ 温带属和热带属之比值） 不仅受纬度地带性影响，也受垂直地带性影响；在海拔相差不大的情况下蒙古栎群落Ｔ／Ｒ 值随着纬度的递增而递增，热带分布属随着纬度递增而减少．垂直地带性对Ｔ／ Ｒ 之比率也有较大的影响，使得Ｔ／Ｒ 值随纬度变化时出现波动．并给出了Ｔ／Ｒ 值、纬度和海拔三者关系的回归方程，结果表明Ｔ／ Ｒ 值与纬度、海拔有着比较精确的数量关系．最后对这种分布格局产生的原因进行了解释
The genus of 192 genera in Quercus mongolica community in northeast China were analyzed, of which 72 species belonged to temperate zone and 9 belonged to tropical zone. 7%. We also compared the distribution types of Quercus mongolica community species in 10 locations in northeastern China and 1 in Hebei Province, and calculated the proportion of the distribution types of different genus in total genus. / R). The results showed that the temperate distributions and T / R values (the ratio of temperate and tropical genus) of Quercus mongolica community were not only affected by latitudinal zonality but also by vertical zonality. In the case of small difference in altitude The T / R value of Quercus mongolica community increased with increasing latitude, and the tropical distribution decreased with increasing latitude. Vertical zonal T / R ratio also has a greater impact, making the T / R values fluctuate with latitude. The regression equations of T / R, latitude and altitude are given. The results show that the T / R value has a precise relationship with latitude and altitude. Finally, the reasons for this distribution pattern are explained