Introduction

It has been shown (see Exergy, where the definition of eco-exergy and exergy are given as well) that eco-exergy is equal to biomass times Kullback's information measure. Therefore, the more biomass an ecosystem has and the more information it contains, the higher is the eco-exergy. It has also been shown that eco-exergy equals the energy needed to break down the system. Model studies have shown by statistical analysis that eco-exergy stored in the structure and the information are well correlated with the sum of buffer capacities or resistances. A statistical analysis is of course not as strong a support as a mathematical analysis; but we can conclude that there seems to be a relationship between eco-exergy and buffer capacity, which of course is an important factor for the sustainabil-ity of ecosystems. Eco-exergy is a measure of the buffer capacity, the resistance, and the inverse sensitivity of the system. Eco-exergy should therefore be a good holistic indicator for how developed an ecosystem is and how difficult it is to destroy it and change it.

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