Are plant populations seed limited? A critique and meta-analysis of seed addition experiments
Are plant populations seed limited? A critique and meta-analysis of seed addition experiments
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DOI：
10.1086/518565
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发表时间：
2007-07-01
影响因子：
2.9
通讯作者：
Osenberg, C. W.
中科院分区：
文献类型：
--
作者：
Clark, C. J.;Poulsen, J. R.;Osenberg, C. W.
我们研究的相对重要性的过程，植物种群丰度和分布的基础。两种对立的观点主导着这一领域。一个假设，建立在一个网站的能力是由合适的微型网站的可用性（建立限制），而第二个断言，补充是有限的种子的可用性（种子限制）。一个根本的问题是，建立和种子限制通常被视为相互排斥的。我们进行了一项种子添加实验的荟萃分析，以评估建立和种子限制幼苗招募的相对强度。我们问（1）种群的种子和建立在多大程度上是有限的？(2)在什么情况下（E）例如，在一个实施例中，栖息地和生活史特征）物种或多或少受到各自的限制？(3)如何更好地设计种子添加研究，以提高我们对植物补充的理解？我们发现，与以前的研究一致，大多数物种都是种子有限的。然而，种子添加的效果通常很小，并且大多数添加的种子不能补充到幼苗阶段。因此，建立限制比种子限制更强。种子的限制是更大的大种子的物种，物种在被干扰的微型网站，和物种相对短命的种子银行。大多数种子添加实验不能评估添加的种子数量和随后补充的数量之间的关系。这一缺点可以通过增加种子添加处理的数量和范围来克服。
We examine the relative importance of processes that underlie plant population abundance and distribution. Two opposing views dominate the field. One posits that the ability to establish at a site is determined by the availability of suitable microsites (establishment limitation), while the second asserts that recruitment is limited by the availability of seeds (seed limitation). An underlying problem is that establishment and seed limitation are typically viewed as mutually exclusive. We conducted a meta-analysis of seed addition experiments to assess the relative strength of establishment and seed limitation to seedling recruitment. We asked (1) To what degree are populations seed and establishment limited? (2) Under what conditions (e. g., habitats and life- history traits) are species more or less limited by each? (3) How can seed addition studies be better designed to enhance our understanding of plant recruitment? We found that, in keeping with previous studies, most species are seed limited. However, the effects of seed addition are typically small, and most added seeds fail to recruit to the seedling stage. As a result, establishment limitation is stronger than seed limitation. Seed limitation was greater for large-seeded species, species in disturbed microsites, and species with relatively short-lived seed banks. Most seed addition experiments cannot assess the relationship between number of seeds added and number of subsequent recruits. This shortcoming can be overcome by increasing the number and range of seed addition treatments.