Tree regeneration in partially cut conifer-hardwood mixed forests in northern Japan: roles of establishment substrate and dwarf bamboo
Tree regeneration in partially cut conifer-hardwood mixed forests in northern Japan: roles of establishment substrate and dwarf bamboo
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DOI：
10.1016/j.foreco.2003.10.024
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发表时间：
2004-03-22
影响因子：
3.7
通讯作者：
Yoshida, T
中科院分区：
文献类型：
--
作者：
Noguchi, M;Yoshida, T
研究了7种典型高乔木的更新密度与过去部分采伐和现在林分结构的关系。我们还确定了树木再生的差异是否与建立基质（粗木屑（CWD）和根屑）和林下抑制植被（矮竹物种：Sasa senanensis）有关。这项研究是在日本北部北海道大雪区的17个针叶林和阔叶林混交林中进行的。结果表明，林分结构是影响林分再生密度的主要因素，而非采伐强度。针叶树基面积与各树种更新密度呈显著正相关，其中2种针叶树和3种阔叶树的更新密度显著高于其他树种。这些模式不同于在该地区的老树林中观察到的模式。针叶林总基带面积与矮竹盖度呈负相关，说明茂密针叶林的存在通过阻止矮竹的优势而增加了高乔木的更新密度。云杉（Picea glehnii）是一种高度依赖自然环境建立的树种，在采伐强度高的林分，其幼苗密度和幼树密度都较低。这似乎是由于这些林分随采伐强度的增加，CWD的体积减少的结果。建议在降低采伐强度的同时，保留上层针叶林，以建立可持续的造林系统。提供足够的CWD和根抛物对于确保需要这些作为建立基质的树种的自然再生也很重要。(C) 2003 Elsevier B.V.版权所有
We assessed the relationship of the regeneration (seedling and sapling) densities of seven representative tall-tree species to the past partial cutting and current stand structure. We also determined if differences in tree regeneration were associated to establishment substrates (coarse woody debris (CWD) and root throws) and understory inhibitor vegetation (the dwarf bamboo species: Sasa senanensis). The study was conducted in 17 conifer-hardwood mixed stands in a heavy snowfall region in Hokkaido, northern Japan. The results suggest that stand structure, rather than logging intensity, is the primary factor influencing regeneration densities. Total conifer basal area was positively correlated with the regeneration density of individual tree species, including two conifers and three hardwoods. These patterns differ from those observed in old-growth stands in the region. A negative correlation between total conifer basal area and dwarf bamboo coverage suggests that the presence of dense conifer canopies causes an increase in regeneration density of tall-tree species by preventing domination of dwarf bamboo. Picea glehnii, a species that depends for its establishment strongly on CWD, has lower seedling and sapling density in stands with higher logging intensity. This seems to be a result of the decrease in the volume of CWD with increasing logging intensity in these stands. We suggest that both reducing logging intensity and retaining overstory conifers should be considered to develop a sustainable silvicultural system in this region. Providing sufficient CWD and root throws may also be important to ensure natural regeneration of tree species that require these as an establishment substrate. (C) 2003 Elsevier B.V. All rights reserved.