热带雨林中的树木多样性:验证中间干扰假设
1Institut de Recherche pour le Développement, c/o Cirad-forêt, Campus International de Baillarguet, TA10/D, 34398 Montpellier Cedex 5, France. molino@mpl.ird.fr
Science (New York, N.Y.)
|November 27, 2001
概括
中间干扰假设在圭亚那森林中进行了测试,发现物种丰富度在中间树冠干扰时达到顶峰. 这支持了热带树种群的假设,特别是在考虑依赖光的物种时.
科学领域:
- 生态生态学 生态生态学
- 林业林业 林业 林业 林业
- 生物多样性研究的研究.
背景情况:
- 介质干扰假说认为,在介质干扰水平上,物种多样性最大.
- 这一假设尚未在物种丰富的热带森林或影响光环境的局部树冠干扰中得到明确证明.
研究的目的:
- 在圭亚那热带森林树木社区测试中间干扰假设.
- 调查干扰强度,光线可用性和树种丰富性之间的关系.
主要方法:
- 在圭亚那的森林中进行了一项森林实验,创建了各种干扰强度的范围.
- 树木物种丰富性在实验后10年被评估在17,000棵树的样本上.
- 种类丰富性是标准化的密度效应,与干扰强度相关联,包括光依赖物种的比例.
主要成果:
- 物种丰富度在中等干扰水平时呈现高峰.
- 物种丰富度和干扰之间的相关性在干扰强度以依赖光的物种茎的百分比来衡量时是最强的.
结论:
- 这项研究提供了支持热带森林树群中中介干扰假设的证据.
- 树冠的干扰,特别是它对依赖光线的物种光线的可用性的影响,是影响树木物种丰富性的关键因素.
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