Recruitment of Pterocarpus angolensis in the wild
Recruitment of Pterocarpus angolensis in the wild
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DOI：
10.1016/j.foreco.2005.07.004
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发表时间：
2005-11-25
影响因子：
3.7
通讯作者：
Bella, EM
中科院分区：
文献类型：
--
作者：
Caro, TM;Sungula, M;Bella, EM
安哥拉紫檀是一种硬木树种，在非洲中南部的 miombo 林地受到大量开采。在坦桑尼亚西部测得的自然补充率很低，尽管种子产量相当可观，但只有三分之一的母树产生了幼苗。尽管受到严格保护的地区支持大型母树，但这些成虫附近胸径> 5厘米的幼苗很少，这可能表明高密度的觅食有蹄类动物造成的死亡。在这些受到良好保护的地区之外，砍伐已经砍掉了大多数大树，剩下的成虫都很小，产生的种子相对较少。影响补充的因素包括位置和海拔，这可能表明降水量较多，而短草和母体冠层覆盖率的减少与更多的幼苗有关，表明对光的竞争。考虑到这些招募率，可持续利用安哥拉松的前景看起来很黯淡。 (c) 2005 Elsevier B.V. 保留所有权利。
Pterocarpus angolensis is a hardwood species subject to heavy exploitation throughout miombo woodlands of south-central Africa. Rates of natural recruitment measured in western Tanzania were found to be low, with only a third of parent trees generating any seedlings despite considerable seed production. Although heavily protected areas supported large parent trees, these adults had very few seedlings of > 5 cm DBH nearby, possibly suggesting mortality caused by high densities of browsing ungulates. Outside these well protected areas, cutting has removed most large trees and remaining adults are small producing relatively few seeds. Factors affecting recruitment include location and elevation perhaps indicative of higher precipitation, whereas short grass and reduced parent canopy cover are associated with more seedlings suggesting competition for light. Given these recruitment rates, the prognosis for sustainable exploitation of P. angolensis looks bleak. (c) 2005 Elsevier B.V. All rights reserved.