高级检索
    周超凡, 张会儒, 徐奇刚, 雷相东. 基于相邻木关系的林层间结构解析[J]. 北京林业大学学报, 2019, 41(5): 66-75. DOI: 10.13332/j.1000-1522.20190051
    引用本文: 周超凡, 张会儒, 徐奇刚, 雷相东. 基于相邻木关系的林层间结构解析[J]. 北京林业大学学报, 2019, 41(5): 66-75. DOI: 10.13332/j.1000-1522.20190051
    Zhou Chaofan, Zhang Huiru, Xu Qigang, Lei Xiangdong. Analysis of inter-layer structure based on the relationship of neighboring trees[J]. Journal of Beijing Forestry University, 2019, 41(5): 66-75. DOI: 10.13332/j.1000-1522.20190051
    Citation: Zhou Chaofan, Zhang Huiru, Xu Qigang, Lei Xiangdong. Analysis of inter-layer structure based on the relationship of neighboring trees[J]. Journal of Beijing Forestry University, 2019, 41(5): 66-75. DOI: 10.13332/j.1000-1522.20190051

    基于相邻木关系的林层间结构解析

    Analysis of inter-layer structure based on the relationship of neighboring trees

    • 摘要:
      目的林层是林分空间结构垂直尺度上的一种结构,也是当前林分空间结构的研究热点。对于林层的研究多集中于林层划分的方法以及各林层内的结构分析,而对林层间的关系研究较少。细致的林分结构分析是森林精准经营的前提,探讨林层结构的分布及其与生长量的关系可以丰富结构化森林经营的理论基础,对竞争指数的构建也有一定指导价值。
      方法基于相邻木关系,区分对象木和相邻木在上、中、下林层中的分布,将林层比(L)的5种情形细化为45种“林层结构类型”,结合林层比对蒙古栎林分的林层结构的株数分布进行深度解析,并探讨与林木生长量之间的关系规律。
      结果(1)蒙古栎林分林层结构较复杂:对象木结构单元中4株相邻木都与对象木同层的情况较少,而2株或3株相邻木与对象木不同层的情况较多;对象木结构单元中5株林木在3个林层都有分布的情况是最多的,其次5株林木倾向于分布在相邻的两个林层中,且中层分布有较多林木的林层结构类型的数量较多。(2)蒙古栎林分林层比类型间生长量的差异显著度为:下层 > 上层 > 中层;当对象木同层的相邻木从4株到0株时,下层对象木生长量有显著下降趋势,上层有明显上升趋势,而中层的相邻木的作用复杂,导致生长量没有显著变化趋势。(3)影响蒙古栎林上层对象木生长的林层因素较为单一,主要为上层相邻木的侧向挤压作用;而林层因素影响蒙古栎林中、下林层生长的作用是较为复杂的:中层对象木主要受上层的遮盖影响较大,其次是中层的侧向挤压;下层对象木主要受中层的遮盖影响较大,其次是下层的侧向挤压或上层的遮盖影响。
      结论本文构建的“林层结构类型”在分析林层结构的数量分布、解释生长量的大小方面都有较好的效果,可以系统又全面地解析林层间结构。

       

      Abstract:
      ObjectiveForest layer is a kind of structure on vertical scale of stand spatial structure, which is also a research hotspot of stand spatial structure at present. The study of forest layer mostly focuses on the methods of forest layer division and the analysis of the structure of each forest layer. However, there were few studies on the relationship between forest layers. Detailed analysis of stand structure is very helpful for precise forest management. Exploring the distribution of forest layer structure and its relationship with growth can enrich the theoretical basis of structured forest management, and also has certain guiding value for the construction of competition index.
      MethodBased on the relationship between neighboring trees, the distribution of target trees and neighboring trees in the upper, middle and lower forest layers was distinguished. Five cases of stand level rate (L) were refined to 45 types of " forest layer structure types”. The distribution of forest layer structure of Q. mongolica forest was deeply analyzed with L and forest layer structure types, then the relationship between them and DBH increment was discussed.
      Result(1) The forest layer structure of Q. mongolica forest is more complex: four neighboring trees in the structural unit of the target wood were less in the same layer with the target wood, while cases of two or three neighboring trees distributing in different layers with the target wood were more common. In the target tree structure unit, the five trees tended to distribute in three forest layers or in two adjacent forest layers, and the more trees distributed in the middle layer, the more quantity of this sort of " forest layer structure type” was. (2) The significant difference of DBH increment between the stand level rate type of the Q. mongolica forest was: the lower layer > the upper layer > the middle layer; when the neighboring trees in the same layer ranged from 4 to 0, the growth of the underlying trees had a significant downward trend, the upper trees had a significant upward trend, while the role of the neighboring trees in the middle layer was complicated, resulting in no significant change in the growth. (3) The forest layer factors affecting the growth of upper target trees in Q. mongolica forest were relatively simple, mainly the lateral extrusion of the neighboring trees in the upper layer; while the effects of forest layer factors on the growth of lower and middle forest layers in Q. mongolica forest were more complicated. The middle object wood was mainly affected by the cover of upper layer trees, followed by the lateral extrusion of the middle layer trees; the lower target wood was mainly affected by the cover of the middle layer, followed by the lateral extrusion of the lower layer or the cover of the upper layer.
      ConclusionThe " forest layer structure type” constructed in this paper has a good effect in analyzing the quantity distribution of forest layer structure and explaining the size of DBH increment. It can systematically and comprehensively analyze the inter-layer structure.

       

    /

    返回文章
    返回