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大兴安岭地区是我国的重点国有林区和天然林主要分布区,也是唯一的寒温带针叶林区和国内仅存的寒温带生物基因库,主要树种有兴安落叶松、白桦和樟子松等。大兴安岭地区异龄林占比较大,林木多呈年龄差异大,林分结构复杂,抗逆性强,生长稳定,生态效益显著的多树种混交复层异龄林。异龄林经营技术复杂,木材生产成本高,经济效益可观,因此,评估方法也日益重要。一、异龄林的结构特点异龄林最主要的特点就是林分年龄不一致,经过调
Daxinganling area is the key state-owned forest area and the main distribution area of natural forest in China. It is also the only cold temperate coniferous forest area and the only remaining cold temperate biological gene pool in China. The main tree species are Larix gmelinii, Betula platyphylla and Pinus sylvestris. Daxinganling area accounted for a large proportion of different ages of forest, mostly multi-aged trees with large differences in stand structure, strong resistance, stable growth, significant ecological benefits of mixed multi-layer mixed forest. The heterogeneous forest management technology is complex, the timber production cost is high, and the economic benefits are considerable. Therefore, the assessment method is also increasingly important. First, the structural characteristics of different age forest The main characteristics of different age forest is inconsistent stand age, after the tune