环渤海地区生态效率评价及空间演化规律

运用三阶段DEA模型对环渤海沿海地区17个城市的生态效率进行测算,并结合标准差椭圆和重心坐标方法,定量分析了2006-2015年环渤海地区生态效率的空间演化规律。结果表明：（1）基于三阶段DEA模型测算的生态效率结果,环渤海沿海17市的生态效率总体呈中等偏上水平,且2006-2015年效率值持续上升,天津、唐山、青岛、大连位居前四,17市中绝大多数城市生态效率值低于环渤海平均值,地区差异十分显著。（2）标准差椭圆结果显示环渤海沿海地区生态效率整体呈东北—西南格局,且有逐渐向西南偏移的趋势。（3）环渤海地区生态效率存在明显的省际差异性,且各省限制性因素区别较大。

Ecological efficiency evaluation and spatial evolution in Bohai Rim region

As the center of economic development in northern China, the coastal areas around the Bohai Sea (Bohai Rim region) have greatly boosted the development in this region. However, in recent years, there are many inharmonious conditions in this region due to various reasons. Applying the three-stage of DEA model, this paper has calculated the eco-efficiency of 17 cities in the Bohai Rim. Combining the standard deviation ellipse and gravity center transfer method, this paper has concluded the evolution law of ecological efficiency space transfer in the 17 cities of the study region. Therefore some conclusions can be drawn as follows: (1) Based on the eco-efficiency result measured by the three-stage DEA model, the eco-efficiency of the 17 cities in the Bohai Rim region is generally above average, and the efficiency value continued to rise from 2006 to 2015. Among the 17 cities, Tianjin, Tangshan, Qingdao, and Dalian rank the top four in the efficiency, and for the rest of the 17 cities, the eco-efficiency is lower than the average, which indicates that there is a significant regional difference. (2) The result of the standard deviation ellipse is in the northeast-southwest direction and has a tendency gradually towards the southwest. On the whole, we have not found an obvious transfer of the eco-efficiency center in the Bohai Rim. (3) There are significant provincial differences in the study region, as well as a big difference between the highest and lowest values. Among them, several provinces with the lowest values have remained unchanged in the ecological efficiency for a long time, and the restrictive factors of different provinces are quite different.