Ontogenetic Changes in Carbohydrate Storage and Sprouting Ability in Pioneer Tree Species in Peninsular Malaysia
Ontogenetic Changes in Carbohydrate Storage and Sprouting Ability in Pioneer Tree Species in Peninsular Malaysia
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DOI：
10.1111/btp.12036
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发表时间：
2013-07
期刊：
影响因子：
2.1
通讯作者：
T. Kenzo;T. Ichie;R. Yoneda;Ayumi Tanaka‐Oda;M. Azani;N. M. Majid
中科院分区：
文献类型：
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作者：
T. Kenzo;T. Ichie;R. Yoneda;Ayumi Tanaka‐Oda;M. Azani;N. M. Majid
不同树种的萌生能力差异很大。在很多情况下，幼苗在生长和储存之间的碳分配存在权衡。然而，这种权衡可能会随着从幼苗到成熟植株的生长阶段而改变，因为生殖活动中的碳投入以及/或者受干扰的风险也会因物种和生长阶段而改变。为了研究萌生能力和碳水化合物储存如何随生长阶段而变化，我们比较了两种具有不同生态特征的热带次生林树木——血桐（Macaranga bancana）和大血桐（M. gigantea）。大血桐的最大树体尺寸和生长速率更高。我们在截干处理后的12个月内，对不同树体大小的植株监测了萌条生长以及储存的资源，包括根中的总非结构性碳水化合物（TNC）和氮。在这两个物种中，小型个体的萌生能力（萌条总质量）和TNC浓度都显著高于较大的植株。截干后，所有大小级别的TNC浓度都下降了。血桐的萌条存活率高于大血桐，而大血桐在较大树体大小级别中具有更高的萌生能力。因此，在这两种血桐属植物中，萌生能力可能取决于根的TNC浓度和树体大小级别。血桐中较高的TNC浓度和萌条存活率可能与其在生存方面比在生长方面分配更多的碳有关。这一假设与血桐的生态特征是一致的，比如它的生长速率低于大血桐。
Sprouting ability is highly variable among different tree species. In many cases, there are trade‐offs in carbon allocations between growth and storage in seedlings. However, this trade‐off is likely to change with growth stages from seedling to mature plant because carbon investments in reproductive activities and/or risk of disturbance also change by species and growth stage. To examine how sprouting ability and carbohydrate storage change with growth stage, we compared two tropical secondary‐forest trees, Macaranga bancana and M. gigantea, which have different ecological traits. Maximum tree size and growth rate are higher in M. gigantea. We monitored sprout growth and stored resources, including total non‐structural carbohydrate (TNC) and nitrogen in the root, among different tree sizes for 12 months following stem‐cutting treatment. Sprouting ability (total sprout mass) and TNC concentrations were significantly higher in small individuals than in larger specimens in both species. TNC concentration decreased in all size classes after stem cutting. Macaranga bancana had greater sprout survivorship than M. gigantea, which had higher sprouting ability in larger tree‐size classes. Thus, sprouting ability likely depends on root TNC concentration and tree‐size class in both Macaranga species. Higher TNC concentration and sprout survival rates in M. bancana may be related to greater carbon allocation in survival than in growth. This hypothesis is consistent with the ecological traits of M. bancana, such as its growth rate, which was lower than that of M. gigantea.