Evaluation of resources and environmental carrying capacity of marine ranching in China: An integrated life cycle assessment-emergy analysis.

Resources and environmental carrying capacity (RECC) describes the ability of a system to achieve healthy and sustainable development. Various marine ranching enterprises have emerged in China in recent years, which have aroused concern and debate about the RECC of marine ranching systems. By taking the environmental impact calculated by life cycle assessment (LCA) into consideration in emergy analysis (EA), this study evaluated the comprehensive RECC performance of the whole system and each stage of a marine ranching system in China. The resource use efficiency (RUE) and system carrying ratio (SCR) of the system were reasonably good. However, its environmental loading ratio (ELR), emergy yield ratio (EYR), and emergy sustainability index (ESI) were unsatisfactory. First, the nonrenewable resources dominated the emergy input. Second, the emergy input from the purchased resources was much greater than that of local resources. Third, the potential environmental impact mainly came from the construction stage. Fourth, serious overload of RECC was observed in the maintenance stage. The results indicate that the system is efficient, and its RECC is in a safe state, but the system has deficiencies in environmental protection and the exploitation and utilization of local resources. The proposed analysis framework helps us comprehensively understand the marine ranching RECC performance and provides a research paradigm reference for the sustainability analysis of other complex eco-economic systems.

[Identification of key factors of marine industrial ecologization]. / æµ·æ´‹äº§ä¸šç”Ÿæ€åŒ–å ³é”®å› ç´ è¯†åˆ«.

It is extremely important to identify key factors of marine industrial ecologization and discriminate the factors that influence degrees and causal relationships for the transformation of marine industrial ecologization nowadays. Based on the conceptual model of marine industrial ecologization, this research built an evaluation system for influencing factors in regional marine industrial ecologization, which included the marine industrial structure ecologization, marine industrial organization ecologization, marine production mode ecologization and marine technological innovations ecologization. The DEMATEL method was applied to analyze the relationships between various influencing factors and drew a network diagram. The results showed that the marine production mode ecologization and marine technological innovation ecologization were in the core position of the evaluation system. They not only revealed the causes of the whole ecological evaluation dimension, but affected the marine industrial organization ecologization and marine industrial structure ecologization. Finally, on the basis of specific indicators in each dimension, some countermeasures and suggestions were put forward to improve the transformation of marine industrial ecologization.