作者: L.X. Zhang , Z.F. Yang , G.Q. Chen
DOI: 10.1016/J.ENPOL.2007.01.022
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摘要: Abstract An ecological energetic evaluation is presented in this paper as a complement to economic account for the cropping–grazing system Inner Mongolia Autonomous Region China year 2000. Based on Odum's well-known concept of emergy terms embodied solar energy unified measure environmental resources, human or animal labors and industrial products, systems diagram developed crop livestock productions with arms sub-arms free renewable natural resource input, purchased investment, yields interactive fluxes between cropping grazing sub-industries. In addition conventional indices yield ratio (EYR), investment (EIR), load (ELR) sustainability index (ESI) introduced congregated assessment essential implication sustainability, new indicators soil cost (SEC), self-support intensity (SSI) orientation (SSO) are defined characterize desertification internal recycling associated special agricultural system. Extensive accounting made cropping-grazing whole well subsystems. The overall shown outstanding production competence compared some other provinces national average China, though confronted severe loss. crops has higher density rate per unit area loss than divided by estimated be same value both subsystems, but activity less extraction intensity, leaving rangeland rest rehabilitate. Suggestions regard local security northern explored land-use policy making.