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为进一步研究有效冠结构及其动态,以长白落叶松人工林团状枝解析及生物量的调查数据,探讨了有效冠的概念及单木和林分有效冠的确定方法。有效冠是指在树冠中处于枝、叶垂直分布密度最大的林冠层之下限高度以上.并对树木生长尤其是对树干的生长起主要作用的冠。有效冠由有效冠高(HEC)来确定,而林木的 HEC 可通过分析树干不同高度处断面积生长量与叶量的垂直分布并结合不同着枝深度的枝条生长量子以确定。结果表明:有效冠处于林冠层的中上部,不受林木间竞争的影响,在同一林分中有效冠高与树木大小无关。因此,落叶松人工林有效冠高在同一林分中基本稳定并与林分平均接触高的位置大致相同。
In order to further study the effective crown structure and its dynamics, the concept of effective crown and the method of determining the effective crown of single wood and stand were discussed based on the data of investigation of clonal growth and biomass of Larix olgensis plantations. Effective crown is in the crown in the branches and leaves perpendicular to the maximum density distribution of the maximum height above the lower limit of the forest canopy growth and especially for the main role of the crown. The effective crown is determined by the effective crown height (HEC), while the HEC of the forest can be determined by analyzing the vertical distribution of the area growth and leaf mass at different heights of the trunk, combined with the branch growth quantum of different branch depths. The results showed that the effective crown was in the middle and upper part of the forest canopy, and was not affected by competition among trees. The effective crown height in the same stand had nothing to do with the tree size. Therefore, the effective crown height of Larix gmelinii plantations was basically the same in the same stand and was about the same as the average stand height of stand.