Liu Yue, Zhang De-Peng, Ji Li, Xu Li-Ying, Dong Ling-Bo, Yang Li-Xue
Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management, School of Forestry, Northeast Forestry University, Harbin 150040, China.
Jilin Academy of Forestry, Changchun 130033, China.
Ying Yong Sheng Tai Xue Bao. 2020 Oct;31(10):3296-3304. doi: 10.13287/j.1001-9332.202010.004.
The distribution pattern and interspecific associations of arbor seedlings were examined in two forest stands in Zhangguangcailing, with one without man-made interference (natural recovery secondary forest) and the other one being 20-year-old after selective cutting (selective cutting secondary forest). The results showed that the importance value of the seedlings of the soft broad-leaved (heliophile) and tolerant tree species was 7.9 and 64.5 in natural recovery secondary forest, and was 3.9 and 68.9 in selective cutting secondary forest, respectively. The spatial distribution pattern of arbor seedlings in natural recovery and selective cutting secondary forests showed clustered distribution at the scale of 0-18 m and 0-15 m, respectively. Most of tree species pairs were negatively correlated at large scale (14-45 m) in the natural recovery secondary forest, whereas tree species pairs at all the scales were mostly uncorrelated in the selective cutting secon-dary forest. Most of the tree pairs of seedlings (57%) with other tree species showed negatively correlation at large scale (31-45 m). In the natural recovery secondary forest, the proportion of negatively correlated tree pairs was higher than 60%. In selective cutting secondary forest, seedlings were negatively correlated with other tree species at more scales (6-45 m). In the natural recovery secondary forest, the pairs of . and other arbor seedlings were positively correlated at small scale (0-5 m), but not at large scale (31-45 m). Therefore, selective cutting accelerated the succession of the secondary forest of . , which induced random distribution of the arbor seedlings at the large scale (31-45 m), promoted a more coordinated inter-specific relationship, and adjusted the spatial competition between . seedlings. Both stands were under succession, and thus suitable artificial management should be carried out to promote tree regeneration and community restoration.
在张广才岭的两片林分中，对乔木幼苗的分布格局和种间关联进行了研究，其中一片为无人工干扰的（天然恢复次生林），另一片为择伐后20年的（择伐次生林）。结果表明，软阔叶（喜光）和耐荫树种幼苗的重要值在天然恢复次生林中分别为7.9和64.5，在择伐次生林中分别为3.9和68.9。天然恢复次生林和择伐次生林中乔木幼苗的空间分布格局分别在0 - 18米和0 - 15米尺度上呈集群分布。在天然恢复次生林中，大多数树种对在大尺度（14 - 45米）上呈负相关，而在择伐次生林中，所有尺度上的树种对大多不相关。大多数幼苗树种对（57%）与其他树种在大尺度（31 - 45米）上呈负相关。在天然恢复次生林中，负相关树种对的比例高于60%。在择伐次生林中，幼苗与其他树种在更多尺度（6 - 45米）上呈负相关。在天然恢复次生林中，[具体树种]与其他乔木幼苗在小尺度（0 - 5米）上呈正相关，但在大尺度（31 - 45米）上不相关。因此，择伐加速了[具体树种]次生林的演替，导致乔木幼苗在大尺度（31 - 45米）上呈随机分布，促进了更协调的种间关系，并调整了[具体树种]幼苗之间的空间竞争。两片林分均处于演替过程中，因此应进行适当的人工管理以促进树木更新和群落恢复。
