Seed and Seedling Demography of Four Co‐Occurring Carpinus Species in a Temperate Deciduous Forest
Seed and Seedling Demography of Four Co‐Occurring Carpinus Species in a Temperate Deciduous Forest
复制标题
温带落叶林中四种共生鹅耳枥属物种的种子和幼苗统计
DOI：
10.2307/1940918
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发表时间：
1995
期刊：
影响因子：
4.8
通讯作者：
T. Nakashizuka
中科院分区：
文献类型：
--
作者：
M. Shibata;T. Nakashizuka
为了弄清更新特性及其适合性，我们在日本中部小川森林保护区的一片古老的温带落叶林中，比较了四种共生物种--雪松、雪松、雪松和雪松的种子落地、出苗和第一年幼苗存活情况。种子落地后1.5年萌发的黄连出苗率(5.5%)低于其他树种(8.5-11.2%)。郁闭式林冠下，云杉和日本鹅掌柴的第一年存活率(2.7%)远低于云杉和心叶锦鸡儿(7.5-8.5%)，表明前两者比后两者对干扰的依赖性更强。它们的种子和幼苗表现基本上是种雨型的，但黄连和疏花黄连能够建立种子库，而黄连也有种子库。这些再生策略在一定程度上解释了这四个物种在这片古老森林中的丰度和种群结构。多元回归分析表明，地形对所有物种的生存都是重要的，但冠毛锦鸡儿除外。这一结果与这些物种在该森林中的成虫分布一致。风的扩散是有效的，既可以逃避依赖密度或距离的高死亡率，也可以增加到达树冠空隙的机会，那里的苗木存活率很高。然而，逃避高死亡率似乎对莱克西菲拉和黄花锦鸡儿相对更重要(苗库策略)，而到达树冠空隙对黄花锦鸡儿和日本锦鸡儿相对更重要(种子雨策略)。
In order to clarify regeneration traits and their fitness, we compared seed fall, seedling emergence, and first-year seedling survival of four co-occurring species, Carpinus tschonoskii, C. japonica, C. laxifiora, and C. cordata, in an old-growth temperate deciduous forest in Ogawa Forest Reserve, central Japan. Seedling emergence ratio of C. cordata (5.5%), whose seeds mostly germinated 1.5 yr after seed fall, was lower than the other species (8.5-11.2%). First-year seedlings of Carpinus tschonoskii and C. japonica had much lower survival rates (2.7%, both species) than C. laxifiora and C. cordata (7.5- 8.5%) under closed canopy, suggesting that the former two are more disturbance dependent than the latter two. They are characterized by their seed and seedling performances as seed rain type fundamentally; however, C. cordata and C. laxiflora are able to establish a seedling bank, and C. cordata has a seed bank too. These regenerative strategies partly explain the abundance and population structure of the four species in this old-growth forest. Multiple regression analyses showed that topography was important for survival of all species but C. cordata. This result was consistent with the adult distribution of these species in this forest. Wind dispersal of Carpinus is effective, both to escape from density- or distance- dependent high mortality and to increase the chance of arriving at canopy gaps, where seedling survival rate is high. However, escaping high mortality seems relatively more important for C. laxifiora and C. cordata (seedling bank strategy), and arriving at a canopy gap is relatively more important for C. tschonoskii and C. japonica (seed rain strategy).