... 自然稀疏 self thinning 林木分级 tree classification 克拉夫特分级法 Kraft's tree classification ...
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本文采用动态可比性林木分级法，研究了东北东部天然赤松林的种群结构。
The method of dynamic comparable tree classification was introduced to study the population structure of natural Japanese red pine forest in Northeast China.
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