大城市保障房供应的两种结构——发展阶段转换背景下的广深实践

从住房供应结构(Structure of Housing Provision)的理论视角出发,基于广深两城实践,着重论述中国大城市保障房供应的两种结构,即"政府主导"(大规模建设模式)和"政企联合"(配建模式)。不同的供应结构,根植于不同阶段的社会经济及城市发展背景,其本质为不同行动主体由于资源动员能力的差异而联合起来以实现保障房供应。"政府主导"的大规模建设模式盛行于"十二五"期间,主要受自上而下的中央政府压力以及城市扩张期郊区建设用地的相对可获得性所驱动。在"后‘十二五’"时期,一方面大城市发展阶段逐渐由增量扩张转向存量更新,新增建设用地受限,而存量用地更新涉及复杂的利益主体和高昂成本,在此情景下"企业化"的政府无法"独自"实现保障房供应;与此同时,大城市的保障房需求日益高涨,实现保障房供应的主体多元化(特别是开发商)是形势所需,"政企联合"的配建模式成为典型。

Comparisons of urban-related warming for Shenzhen and Guangzhou

Urban-related warming in two first-tier cities(Guangzhou and Shenzhen)in southern China with similar large-scale climatic backgrounds was compared using the nested weather research and forecasting regional climate model.The default urban data in the model were replaced by reconstructed annual urban data retrieved from satellite-based images for both coarse-(including all of China)and fine-resolution domains(eastern China and three city clusters in China:Beijing– Tianjin–Hebei(BTH),the Yangtze River Delta(YRD),and the Pearl River Delta(PRD)),which reproduced urban surface expansion during the past few decades.The results showed that the 37-year(1980–2016)area-averaged annual urban-related warming was similar(0.69°C/0.64°C)between the urban areas of Guangzhou/Shenzhen;however,the values across the entire area of the two cities varied(0.21°C/0.45°C).Seasonal characteristics could be detected for mean surface air temperatures(SAT)at 2 m,SAT maximum and minimum,and diurnal temperature range(DTR).Both the SAT maximum and minimum generally increased,especially over urban areas;however,changes in the SAT minimum were larger,which induced a decrease in DTR.The DTR in summer decreased by-0.25°C/-0.86°C across the entire area of the two cities and decreased by-0.93°C/-1.15°C over urban areas.The contributions of urban surface expansion to regional warming across the entire area of the two cities were approximately 17%/35%of the overall warming and much greater over Shenzhen.However,the values over urban areas were much closer to the values from total warming(35%/44%).

Comprehensive Assessment and Promotion Policy of Producer Services' Competitiveness in Beijing City:A Comparative Analysis among Beijing,Tianjin,Shanghai,Guangzhou and Shenzhen

The five central cities-Beijing,Tianjin,Shanghai,Guangzhou and Shenzhen-of the three most important strategic regions in China,namely Beijing-Tianjin-Hebei metropolitan region,the Yangtze River Delta and the Pearl River Delta,are taken as a comparative analysis on urban producer services' competitiveness,especially focusing on the comparative advantages and disadvantages of producer services in Beijing.Firstly,based on an integrated indicator system including one objective hierarchy,four standard hierarchies and 35 indicator hierarchies,the study applies factor analysis model and analytic hierarchy process model reformed by entropy technology to measure the comprehensive competitiveness of producer services in the above five cities.Secondly,Beijing has comparative advantages of capital resource,industrial base,scientific research resource and market scale,since it takes the first place of the five cities in the comprehensive competitiveness of producer services,the competitiveness of industrial development,business environment and living environment,only inferior to Shanghai in the competitiveness of talent capital.Thirdly,Beijing has comparative disadvantages in the level of producer services development,urban innovation capability and living environment.Finally,five proposals are put forth to enhance the competitiveness of producer services in Beijing,namely perfecting the system of laws and statutes,supporting the development of industry association,implementing scientific development planning,introducing preferential fiscal and taxation policies and strengthening human capital reserve.