Abstract
A quantitative analysis and an evaluation of the eco-economic system of Hunan Province were performed on the basis of emergy theory. The results show that in 2004, total emergy used in Hunan Province is 2.23×1023 sej, including renewable emergy flow (3.52×1022 sej) and non-renewable emergy flow (2.08×1023 sej). Emergy value in money flow is 6.21×1023 sej, including import-emergy flow (1.07×1022 sej) and export-emergy flow (3.09×1022 sej). Total waste emergy is 4.11×1021 sej, 1.84% of total emergy of the province. Ratios of self-support emergy and net emergy yield are 95.20% and 23.72, respectively. Net-export emergy, per-capita emergy, emergy density, emergy/dollar ratio and emergy investment ratio are 2.02×1022 sej, 3.32×1015 sej, 1.05×1012sej·m-2, 3.33×1012 sej·＄-1 and 4.36% respectively. Ratio of electric power to total emergy is 12.60%, environmental loading ratio is 5.34, carrying capacity of renewable energy is 1 056.90×104 persons and total carrying capacity is 8 455.18×104 persons. On the basis of the results, vital suggestions are advanced for the sustainable development of eco-economic system in Hunan Province.
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