Geographical variation in the early regeneration process of Siebold's Beech (Fagus crenata BLUME) in Japan
Geographical variation in the early regeneration process of Siebold's Beech (Fagus crenata BLUME) in Japan
复制标题
日本西博尔德山毛榉 (Fagus crenata BLUME) 早期再生过程的地理差异
DOI：
10.1023/a:1009725007759
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发表时间：
1999
期刊：
影响因子：
1.7
通讯作者：
N. Yamanaka
中科院分区：
文献类型：
--
作者：
Kosuke Homma;N. Akashi;T. Abe;M. Hasegawa;K. Harada;Y. Hirabuki;K. Irie;M. Kaji;H. Miguchi;Noriyasu Mizoguchi;H. Mizunaga;T. Nakashizuka;Syunji Natume;K. Niiyama;T. Ohkubo;S. Sawada;H. Sugita;S. Takatsuki;N. Yamanaka
在日本沿着一个降雪梯度的15个地点研究了毛毛榉（Fagus crenata Blume）更新早期种子死亡的原因和时间，以阐明毛榉幼苗密度具有显著地理差异的原因。种子生产没有显着差异沿着降雪梯度。传播前的种子死亡率的昆虫损害是较高的网站，降雪量较轻的网站，但这似乎只是一个很小的因素影响人口。秋天落下的有活力的坚果中有很大一部分在冬天发芽前就被杀死了。冬季死亡率高得多，在网站与薄积雪覆盖比厚积雪覆盖，这一因素与幼苗更新概率的地理变异密切相关。冬季干燥导致的种子死亡率很低。造成这种地理差异的主要因素似乎是冬季啮齿动物对种子的捕食。厚厚的积雪可能会减少啮齿动物在冬季寻找种子的成功率。因此，所观察到的积雪深度和早期死亡率之间的关系可能是由于通过种子捕食过程的间接影响。
The causes and timing of seed death in early regeneration process of Siebold's beech (Fagus crenata Blume) was studied at 15 sites along a snowfall gradient in Japan, in order to clarify why the seedling density of the species has geographic difference remarkably. Seed production did not significantly differ along the snowfall gradient. Pre-dispersal seed mortality by insect damage was higher at sites with light snowfall than at sites with heavy snowfall, but this only seemed to be a minor factor influencing the population. A large proportion of the viable nuts that fall in autumn ware killed in winter before germination. Winter mortality was much higher at sites with thin snow cover than that at sites with thick snow cover, and this factor was strongly correlated with the geographic variation of seedling regeneration probability. There was little seed mortality by winter desiccation. The main factor contributing to the geographic difference seemed to be a seed predation by rodents in winter. Deep snow cover may reduce the success of rodents finding seeds in winter. Thus the observed relationship between snowpack depth and early mortality may be due to an indirect effect through the process of seed predation.p>