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黄波罗(Phellodendron amurense)、胡桃楸(Juglans mandshurica)、水曲柳(Fraxinus mandshurica)为东北东部阔叶红松林的重要成林树种,可向北向西延伸。分布范围及所处生境表明:耐冻性水曲柳最强,胡桃楸最差;耐旱性黄波罗最高,水曲柳最低。分布北界的限制因子,在内陆为冬季绝对低温过低,在海滨为夏季活动积温不足。东北北部林区(阔叶红松林以北地区),三者分布范围虽广,但基本上处于生理胁迫状态,扩大繁殖尚需慎重。
Phellodendron amurense, Juglans mandshurica and Fraxinus mandshurica are important forest tree species of broad-leaved Korean pine forests in the eastern part of Northeast China, extending north-westward. Distribution range and habitats show that: Frost resistance of the strongest Ash, Juglans mandshuric worst; drought tolerance Huangboluo highest, lowest ash. The distribution of the limit factors in the northern boundary is absolutely too low for winter in the hinterland and insufficient for the summer activities at the waterfront. In the north-eastern part of the forest (north of the Korean pine broad-leaved forest), although the distribution of the three is wide, it is basically in a state of physiological stress, so it is necessary to be cautious in expanding the breeding.