东北地区的大兴安岭、小兴安岭和长白山区，是中国最大的天然林区，到处是望不到边的红松、落叶松、黄花松等针叶林和白桦、柞树、水曲柳、杨树、榆树等阔叶林。
The Greater Hinggan, the Lesser Hinggan and the Changbai mountain ranges in the northeast are China's largest natural forest areas.
本文研究了东北红松、落叶松和黄花落叶松的木材密度和顺纹抗压强度的变异。
Pinus koraiensis, Larix gmelini and Larix olgensis are the species of the most important timber in northeast of China.
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