A conceptual framework for ecosystem stoichiometry: balancing resource supply and demand
A conceptual framework for ecosystem stoichiometry: balancing resource supply and demand
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DOI：
10.1111/j.0030-1299.2005.14050.x
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发表时间：
2005-04
期刊：
影响因子：
3.4
通讯作者：
J. Schade;J. F. Espeleta;C. Klausmeier;M. McGroddy;S. Thomas;Lixia Zhang
中科院分区：
文献类型：
--
作者：
J. Schade;J. F. Espeleta;C. Klausmeier;M. McGroddy;S. Thomas;Lixia Zhang
生态化学计量学的发展集中于生物体及其相互作用，较少强调更大规模的综合生态系统化学计量学的意义或价值。在这里，我们开发了一个概念框架，将空间和时间相关的生态系统中的内部过程和外源因素联系起来。该框架源于生态系统化学计量的功能观点，植根于理解相对化学计量平衡的原因和后果，相对化学计量平衡被定义为资源供需比率之间的平衡。我们首先修改基于资源比率竞争理论的图形模型，将资源供给和需求与生态系统过程联系起来。这种方法确定了生态系统对可变资源供应做出反应的机制或化学计量方案。我们通过考虑资源供应以外的外源因素的影响来扩展这一观点，这些因素构成了影响生态系统内化学计量平衡的化学计量模板。然后，我们描述了几种类型的生态系统中生物化学计量模式的一些例子，这些例子说明了化学计量方案和直接影响化学计量模式的因素。接下来，我们对生态系统之间空间联系的化学计量效应以及它们与边界动态和热点发展的关系进行初步分析。最后，我们概述了将显着增进我们对生态系统结构和功能的化学计量限制的理解的研究方向。
The development of ecological stoichiometry has centered on organisms and their interactions, with less emphasis on the meaning or value of a comprehensive ecosystem stoichiometry at larger scales. Here we develop a conceptual framework that relates internal processes and exogenous factors in spatially- and temporally-linked ecosystems. This framework emerges from a functional view of ecosystem stoichiometry rooted in understanding the causes and consequences of relative stoichiometric balance, defined as the balance between ratios of resource supply and demand. We begin by modifying a graphical model based on resource ratio competition theory that relates resource supply and demand to ecosystem processes. This approach identified mechanisms, or stoichiometric schemes, through which ecosystems respond to variable resource supply. We expand this view by considering the effects of exogenous factors other then resource supply that comprise a stoichiometric template that influences stoichiometric balance within ecosystems. We then describe a number of examples of patterns in organismal stoichiometry in several types of ecosystems that illustrate stoichiometric schemes and factors that impinge directly on stoichiometric patterns. Next, we conduct an initial analysis of the stoichiometric effects of spatial linkages between ecosystems, and how those relate to boundary dynamics and hot spot development. We conclude by outlining research directions that will significantly advance our understanding of stoichiometric constraints on ecosystem structure and function.