The age of tropical rain-forest canopy species, Borneo ironwood (Eusideroxylon zwageri), determined by 14C dating
The age of tropical rain-forest canopy species, Borneo ironwood (Eusideroxylon zwageri), determined by 14C dating
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DOI：
10.1017/s0266467403003018
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发表时间：
2003-01-01
影响因子：
1.4
通讯作者：
Nakashizuka, T
中科院分区：
文献类型：
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作者：
Kurokawa, H;Yoshida, T;Nakashizuka, T
采用C-14测年方法，对分布于东南亚热带雨林的一种木材耐久、耐腐的冠层树种婆罗洲铁木（Eusideroxylon zwageri, Lauraceae）的寿命和生长速率进行了研究。从马来西亚沙捞越Kubah国家公园的15个被砍伐的树桩上收集的木材片段通过加速器质谱分析，并校准获得的数据以确定个体的年龄。C-14测年法被证明是一种有效的方法，用于估计季节性热带地区的长寿树木的年龄，比如兹瓦盖里树，因为估计的误差与估计的年龄相比很小。结果表明，该物种的生长速度非常缓慢，平均径向生长速度为0.058 cm y（-1）。与该热带森林的优势科龙心科树木相比，其寿命要长得多，生长速度要慢得多。该树种的长寿命可能是由于木材的耐久性，具有高比重和丰富的防御化合物；在碳分配相同的情况下，高密度和碳基防御性化合物可能导致生长速率降低。
Using C-14 dating, the life span and growth rate of Borneo ironwood (Eusideroxylon zwageri, Lauraceae), which is a canopy tree species with extremely durable and decay-resistant wood distributed in tropical rain forests of South-East Asia, were studied. Timber segments collected from 15 logged stumps in Kubah National Park, Sarawak, Malaysia, were analysed by accelerator mass spectrometry and the obtained data were calibrated to determine the age of individuals. The C-14 dating turned out to be an effective method for estimating ages of long-lived trees, such as E. zwageri, in the aseasonal tropics because the estimated error was small compared with estimated age. We found that E. zwageri can live more than 1000 y and that the growth rate of this species was very slow, with a mean radial growth rate of 0.058 cm y(-1). The life span was much greater and the growth rate was much slower than those observed or estimated for trees of Dipterocarpaccae, the dominant family in this tropical forest. The long life span of this species may be caused by wood durability with a high specific gravity and abundant defensive compounds; Given equal carbon allocation, the high density and carbon-based defensive compounds may result in a reduced growth rate.