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首页> 外文期刊>Ecological informatics: an international journal on ecoinformatics and computational ecology >Exergy as an indicator: Observations of an aquatic ecosystem model
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Exergy as an indicator: Observations of an aquatic ecosystem model

机译：火用作为指标：水生生态系统模型的观测

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摘要

Exergy is considered as a goal function or ecological orientor. Normally at the edge of oscillation exergy reaches to its maximum value when the ecosystem had no adaptation on it. To study the variation of exergy in different states of ecosystem, a simple three species (phytoplankton, zooplankton and fish) food chain model has been considered. From the model it is shown that the system moves from steady state to chaotic state by decreasing zooplankton body volume in turn increasing its grazing rate. By the property of self-adaptability the system tries to overcome this situation. Two such possible processes are described here: (i) by the toxic effect of phytoplankton and (ii) by reducing half saturation constant of fishes. In both this cases exergy value reduces and the system reaches to stable state. Through the analysis of exergy variation in all these situations this paper shows that the system chose the process in which the reduction of exergy will be the minimum.
机译：火用被认为是目标函数或生态定向因子。通常，在振荡边缘，当生态系统没有适应能力时，其能值达到最大值。为了研究生态系统不同状态下的能动变化，已经考虑了简单的三种物种（浮游植物，浮游动物和鱼类）的食物链模型。从模型中可以看出，该系统通过减小浮游动物的体积反过来增加其放牧率，从而从稳态转变为混沌状态。通过自适应的特性，系统试图克服这种情况。这里描述了两种可能的过程：（i）浮游植物的毒性作用;（ii）降低鱼类的半饱和常数。在这两种情况下，（火用）值降低，系统达到稳定状态。通过分析在所有这些情况下的火用变化，本文表明系统选择了减少火用最小的过程。

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