Distribution pattern for regeneration of a middle to young cut-over Larix gmelinii forest
-
摘要: 对兴安落叶松Larix gmelinii过伐林的林木相对坐标进行相关性分析后发现，胸径D10 cm林木对更新位置和格局有显著影响。采用6种聚集度指标检验林分林木和更新幼树格局后均呈聚集分布。更新格局主要受林分林木和胸径D10 cm林木格局以及更新株数的影响。样方内的林木株数和其相互差异性，确定了林木格局，也影响了更新格局。兴安落叶松、白桦Betula platyphylla和山杨Populus davidiana 3者在更新格局的相互影响中，前两者具有明显的规律，尤其兴安落叶松对白桦更新的影响较普遍。胸径D10 cm兴安落叶松对白桦更新具有促进作用。而D10 cm白桦对兴安落叶松的更新有抑制作用。在更新层中，由上而下白桦、兴安落叶松和山杨以垂直阶梯性分布。平均高占林分高的比例变化为：13.7%~75.0%，12.8%~72.8%，27.8%~61.9%。在今后经营中，将空间格局向随机分布调整，降低聚集系数。可通过调整D10 cm林木负二项参数来调控林分更新格局。参照D10 cm林木位置，掀开凋落物层，露出土壤，进行人工辅助更新。人工补植时，考虑D10 cm林木位置和格局，选择凋落物较厚，种子难以接触土壤的地点作为补植位置，与潜在天然更新能力的位置避免重叠，节省成本，有效促进林分更新，使林分结构更趋合理性。图1表6参15Abstract: Update the location and scope as determined in the young stand Daxingan Mountains Xingan Larch and birch mixed forest over cutting and replanting measures more science, discusses the relationship between the regeneration pattern, location update and location in the tree. Cut-over forests of Larix gmelinii （larch）, Betula platyphylla（birch）, and Populus davidiana （poplar） were used with six aggregated indexes in test stands. Distribution of regeneration patterns was also aggregated. A correlation analysis of relative coordinates for diameter D10 cm was conducted. Results showed that the L. gmelinii forest with D10 cm was significantly correlated （correlation coefficent was －0.564－0.895, P =0.000－0.036） to regeneration location and pattern. The regeneration pattern was also affected by stand structure, the types of trees in the quadrats, and their mutual differences. Larch with D10 cm accelerated regeneration of Japanese white birch; whereas, Japanese white birch with D10 cm inhibited regeneration of larch. Regeneration layers, from top to bottom, had a vertical ladder distribution with B. platyphylla, then L. gmelinii, and then P. davidiana. The average forest height changed as follows: 13.7% to 75.0% （birch）, 12.8% to 72.8% （larch）, and 27.8% to 61.9% （poplar）. In the future, spatial patterns should be adjusted so the D10 cm parameter controls forest regeneration patterns, and for replanting so the D10 cm tree location and pattern choice, litter thickness, soil seed inaccessible locations as replanting position, and the position of potential natural regeneration avoid overlap thereby saving costs, promoting forest regeneration, and providing a more reasonable structure.［Ch, 1 fig. 6 tab. 15 ref.］
-
Key words:
- forest ecology /
- Larix gmelinii /
- cut-over forest /
- distribution pattern /
- regeneration pattern
-
-
链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2015.03.003
点击查看大图
计量
- 文章访问数: 1694
- HTML全文浏览量: 195
- PDF下载量: 484
- 被引次数: 0
下载:
