Seedling demography and establishment of Cryptomeria japonica in a cool-temperate, old-growth, conifer hardwood forest in the snowy region of Japan
Seedling demography and establishment of Cryptomeria japonica in a cool-temperate, old-growth, conifer hardwood forest in the snowy region of Japan
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DOI：
10.1007/s10310-004-0104-0
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发表时间：
2005-02
影响因子：
1.5
通讯作者：
K. Hirayama;M. Sakimoto
中科院分区：
文献类型：
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作者：
K. Hirayama;M. Sakimoto
为明确柳杉苗木的建苗规律，对日本雪域寒温带古林地2年不同微环境条件下的当年苗木种群进行了研究。在这两年中，超过70%的出苗在一年内死亡，幼苗的存活率与微环境条件的差异相似。虽然在倒下的原木和矿物质土壤上的地点存活了一些幼苗，但在第一个生长季结束时，无论是阔叶或针叶枯枝落叶的地点，几乎没有幼苗存活。负的落叶效应可能会杀死大部分的小苗。日本菜。此外，我们还发现，随着距离成虫的距离和树冠开度的增加，幼苗的成活率也越高。数量化理论I的分析表明，在可能的微环境因素中，基质条件对幼苗存活的影响最大。分析还表明，离成虫最近的距离和树冠开度对苗木成活的影响也很大，但影响程度几乎相同，尽管影响比底物条件弱。考虑到建造点有限。日本苗木、分层是该林地更新的主要方式。
To clarify the establishment pattern ofCryptomeria japonicaseedlings, the demography of current-year seedlings was studied under various micro-environmental conditions for 2 years in a cool-temperate old-growth forest in the snowy region of Japan. In both years, more than 70% of seedlings that emerged died within a year, and differences in the survival rate of seedlings with respect to micro-environmental conditions were similar. While a number of seedlings survived at the sites on fallen logs and in mineral soil, almost no seedlings survived at the sites with either broad-leaved or coniferous litters at the end of the first growing season. The negative litter effect may kill most small seedlings ofC. japonica. In addition, we found that survival rates of the seedlings were greater as the distance from the nearest adult and canopy openness increased. An analysis using Quantification Theory I showed that, of the possible micro-environmental factors, substrate conditions had the strongest effect on the survival of seedlings. The analysis also indicated that distance from the nearest adult and canopy openness also affected seedling survival significantly and to almost the same extent, although the effects were weaker than those for the substrate condition. Given the limited establishment sites forC. japonicaseedlings, layering is suggested to be the main mode of regeneration in this forest.