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The use of structural exergy for the assessment of an ecosystem state

The use of structural exergy for the assessment of an ecosystem state. Andrey Mokryy Irkutsk State University, Irkutsk. Exergy is defined as the work the system can perform when it is brought into equilibrium with the environment.

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The use of structural exergy for the assessment of an ecosystem state

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  1. The use of structural exergy for the assessment of an ecosystem state Andrey Mokryy Irkutsk State University, Irkutsk

  2. Exergy is defined as the work the system can perform when it is brought into equilibrium with the environment. • Structural exergy is the exergy related to thetotal biomass. • It is no possible to measure exergy directly, but it is possible to compute it if the composition of the ecosystem is known.

  3. where Ех is the exergy (mg*m-3), Ехstris the structural exergy, R is the gas constant (8,31 J*moles-1*K-1), T is the temperature of the environment (K), сiis the concentration of the i’th componentin ecosystem (mg*m-3), fiis the conversion factor (the exergyof the i’th componentcompared with the exergy content of detritus (about 7,34*105 mg*m-3)).

  4. The aims of research • To establish the limits of changes of structural exergy at the permanent pelagic station (point №1) in Southern Baikal. • To trace the seasonal dynamics of structural exergy. • To compare the data, obtained at the background station №1, with data, obtained in a polluted area.

  5. Long-term dynamics of structural exergy in the layer 0-50 m(permanent station №1, Southern Baikal), 1990-2002.

  6. Minimum and maximum annual values of structural exergy in the layer 0-50 m

  7. Seasonal dynamics of structural exergy in the layer 0-50 m(permanent station №1, Southern Baikal), 1999

  8. Long-term dynamics of structural exergy in the layer 0-50 m, Southern Baikal Structural exergy Point №1 Baikalsk mean mean ±δ

  9. Long-term dynamics of structural exergy in the layer 0-50 m, Southern Baikal, 1998-2002 Point №1 Baikalsk

  10. Dynamics of structural exergy in the layer 0-50 m, Southern Baikal, 1998-2002

  11. Conclusion • The use of structural exergy demonstrate, that there aren’t any negative tendencies in the plankton community in the background region of Southern Baikal. The average annual values of structural exergy from 1990 to 2002 fluctuated around their mean value. • Stability ofspring plankton community less then stability ofsummer-autumnal plankton.

  12. Conclusion • The average annual values of structural exergy and the magnitude of its fluctuation in the region of BPPM waste waters dischargeare higher than in the background region.

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