Exploring harmonious development between urbanization and eco-environment based on climate analysis—A study in Changsha,China

The process of urbanization affects the urban warming. The change of urban warming was investigated by several urbanization factors in Changsha, China. The data of surface temperature (minimum, maximum and mean) of Changsha were analyzed to understand the possible effects of urbanization on the climate of this region owing to the population growth, built-up area expansion and energy consumption increases. The weights of these three factors were calculated by the analytical hierarchy process (AHP). Then, three weights were simulated with nonlinear method to obtain the urbanization development rate which was utilized to reveal the influence of the urbanization factors on the surface temperature. The result shows that there is a significant upward trend in the urban temperatures of Changsha. The temperature increase seems to be closely related to the rate of urbanization between 1993 and 2008, and there is an evidential increase trend of the influence on urban temperature by urbanization during 16 years. It is a quantifiable approach measuring the relationship between urbanization and urban eco-environment, and can be applied for the urban sustainability.     

安化县冷市镇特色小镇城市设计鉴析北大核心

新型城镇化阶段城乡建设要互补、协调发展,强调传承城镇文脉、重塑城镇特色。在此背景下,由浙江省引发的特色小镇建设在我国范围内掀起了广泛关注和建设热潮。从现有的国内外特色小镇看,特色小镇具有生态环境独特、产业独具一格和文化风格鲜明三个特点。新型城镇化背景下的特色小城镇建设应按照"规划为先、特色为本"的思路来打造。安化县冷市镇在充分挖掘和放大小镇的区位特色、地貌特色、建筑特色和产业特色的基础上,确定了"茶旅文化"的特色主题,明确了城市定位,以"山水茶乡·慢城冷市"为理念,以黑茶产业为根、以黑茶文化为魂、以山水生态为基底、以慢形城市为形,通过对特色空间进行差异化的组织,打造独具魅力、特色鲜明的特色小镇,其实践可为其他城市提供参考。     

基于雨水廊道的丘陵城镇多尺度海绵系统构建

大规模开发建设活动使城镇下垫面硬化程度加剧,“三通一平”阻断了雨水径流自然“源一汇”过程,对此,不同地区应根据自身水文“源一汇”特征和水情问题探索适宜的海綿城市规划方法。本文针对丘陵地区沟谷发育密集的特点,提出基于雨水麻道的城镇多尺度海綿系统构建思路和方法,具体而言,根据地形特征提取多个尺度的雨水廊道作为生态排水娜道,通过廊道连接城镇中对应尺度的节点低影响设施,合理划分汇水单元层级化管理雨洪,综上建立生态排水网络解决暴雨多发气候条件下城鎮易涝的问题。同时,通过将海绵系统构建与城市规划编制衔接实现多规合一,探索在空间布局规划、绿地系统规划、雨水管网规划、指标图则规划等总规和控规层面的规划中落实海綿系统的规划途径。     

信息纽带、刚柔之美：桂阳县广电中心投标方案回顾

广电建筑是广播电视的制作和传输中心,在城市生活中所起着不可或缺的作用,也是城市的标志性建筑之一。通过对广电中心投标方案的回顾,展示了地域文化与建筑功能、造型相结合的设计过程。     

外源硒对苎麻的镉胁迫毒性的缓解机制

研究施加外源硒（Se^6＋）对苎麻镉胁迫毒性的保护机制。主要讨论硒对苎麻生长、MDA、抗氧化酶活性以及DNA甲基化水平的影响。苎麻分别在含镉浓度为0、3、6、9 mg/L条件下培养,并对苎麻叶面喷洒硒酸钠（1.2μmol/L）。结果表明,镉浓度为3、6、9 mg/L营养液中培养的苎麻,经过向叶片喷洒低浓度的硒酸钠（1.2μmol/L）处理后,苎麻叶片中的SOD活性增加了35.34%、43.18%、3.63%,POD活性增加了12.45%、14.14%、3.27%,DNA甲基化下降了10.70%、18.18%、15.59%。结果证实了低浓度硒能强化苎麻SOD、POD活性以及平衡苎麻体内DNA甲基化。