The Resource-Ratio Hypothesis of Plant Succession
The Resource-Ratio Hypothesis of Plant Succession
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DOI：
10.1086/284382
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发表时间：
1985-06
期刊：
影响因子：
--
通讯作者：
D. Tilman
中科院分区：
文献类型：
--
作者：
D. Tilman
资源比假说假设每一种植物都是一个上级竞争者，以争夺特定比例的限制性资源，并预测每当两种或两种以上限制性资源的相对可利用性发生变化时，群落组成就会发生变化。研究表明：（1）中温带陆地栖息地的主要限制资源通常是土壤资源，尤其是氮和光;（2）这些资源自然呈负相关，土壤贫瘠的栖息地具有高光可用性，土壤肥沃的栖息地具有低光可用性;（3）植物的生活史应取决于土壤资源沿着的点：光照梯度，在该梯度下植物是上级竞争者;（4）贫瘠土壤上的初级演替和次级演替是由有限的土壤资源和光照的相对有效性的时间梯度引起的。如果，正如假设的那样，专门在低营养栖息地的植物是相对较短的高度，寿命短，生长快，如果他们在生命早期繁殖的植物占主导地位时，在土壤表面的光是有限的，这些生活史的差异可以解释的相似性丰富的土壤上的次生演替的初级演替和次生演替的贫土。
The resource-ratio hypothesis assumes that each plant species is a superior competitor for a particular proportion of the limiting resources and predicts that community composition should change whenever the relative availability of two or more limiting resources changes. It is suggested that (1) the major limiting resources for mesic terrestrial habitats are often a soil resource, especially nitrogen, and light; (2) these resources are naturally inversely related, the habitats with poor soils having high-light availability and the habitats with rich soils having low-light availability; (3) the life history of a plant should depend on the point along the soil-resource: light gradient at which the plant is a superior competitor; and (4) primary succession and secondary succession on poor soils result from a temporal gradient in the relative availabilities of a limiting soil resource and light. If, as hypothesized, plants specialized on low-nutrient habitats are relatively short in height, short-lived, and fast growing, and if they reproduce early in life compared to plants dominant when light at the soil surface is limiting, these life history differences could explain the similarity of secondary succession on rich soils to primary succession and secondary succession on poor soils.