现代田园城市低碳绿色屋顶固碳、节能与二氧化碳减排研究
发布时间：2019-06-21 15:33
【摘要】：成都市政府审时度势提出构建人与自然和谐相融、城乡一体化的“现代田园城市”,而建设绿色屋顶是建设现代田园城市的内容之一。目前,绿色屋顶的生态环境效益、社会经济效益对发展低碳社会的积极作用得到认可,但有关基础数据依然十分有限,制约着绿色屋顶的推广,影响着现代田园城市进程的发展。本文主要探讨了现代田园城市绿色屋顶的结构设计,基质与植物的配置选择与固碳,分析了绿色屋顶的节能与二氧化碳(CO2)减排效益,主要结论如下：1.研究选择三种本土植物(麦冬、肾蕨、金叶女贞)和三种基质(废建渣介质(经处理粒径小于3mm的建渣)、本地自然土壤、污泥介质(污泥与本地自然土壤等体积混合)应用于绿色屋顶,进行一年的对比研究。结果发现：三种基质的有机碳(TOC)含量都较高,处于中等水平；由于基质层厚度有限,基质TOC含量随土层深度的增加减小的趋势不明显；本地自然土壤和污泥介质的固碳能力较好；污泥介质由于营养条件好,含水量高,最合适植物的生长。三种植物的TOC含量差别不大,固碳能力大小为金叶女贞(2.75kg/m2 ·yr)麦冬(0.997 kg/m2·yr)肾蕨(0.97 kg/m2·yr);金叶女贞的生长情况最好,固碳能力强,CO2的固定量最多;麦冬与肾蕨的耐旱、抗寒能力较弱,生产情况一般。绿色屋顶的植物和基质有可观的固碳能力,是一个理想的碳汇系统,绿色屋顶固碳量4.7kg/m2·yr,即190.5kg/yr。2.合理设计营建的绿色屋顶能达到安全可靠、低碳环保、整体美观的功能。通过对比各监测点温度变化分析可知,绿色屋顶夏季降温(1.2℃)、冬季保温(2.5℃)的效果明显。若与一台1.5匹空调进行对比,绿色屋顶每年将节能11lkw·h,节能效益明显；绿色屋顶通过植物与基质对大气中CO2进行吸收,减少二氧化碳排放量17.25kg/m2·yr。按照相应的估算条件(38km2的屋顶面积有50%进行屋顶绿化,绿化面积比例为50%,基质为废建渣介质、本地自然土壤、污泥介质,植物金叶女贞、肾蕨、麦冬按1：1：1配置)得到成都现代田园城市CO2减排量达1.64×108kg/yr; CO2的减排效益与绿色屋顶的基质种类厚度、植物种类、气候条件有关；按照上述条件估算本实验区域的碳汇量达190.5kg C/yr,成都现代田园城市碳汇量4.47x108kg C/yr,具有较好的环境效益和经济效益。3.绿色屋顶的建设需要考虑建筑本身结构特性和环境条件合理设计,同时,选择合适的基质与植物,充分发挥绿色屋顶的环境效益和经济效益。本研究成果可为成都现代田园城市的建设提供一定的推广和参考价值。
[Abstract]:Chengdu Municipal Government puts forward the construction of a "modern pastoral city" with the harmonious integration of man and nature and the integration of urban and rural areas, and the construction of green roof is one of the contents of the construction of modern pastoral city. At present, the ecological and environmental benefits of green roofs and the positive role of social and economic benefits in the development of low-carbon society have been recognized, but the relevant basic data are still very limited, which restricts the promotion of green roofs and affects the development of modern pastoral cities. This paper mainly discusses the structural design of green roof in modern pastoral cities, the selection of matrix and plant configuration and carbon sequestration, and analyzes the energy saving of green roof and the benefit of carbon dioxide (CO2) emission reduction. The main conclusions are as follows: 1. Three kinds of native plants (Ophiopogon japonicus, Dryopteris, Ligustrum lucidum) and three kinds of matrix (waste slag medium (treated slag with particle size less than 3mm), local natural soil and sludge medium (sludge mixed with local natural soil) were selected and applied to green roof for one year. The results showed that the (TOC) content of organic carbon in the three matrices was high and at the medium level; due to the limited thickness of the matrix layer, the decrease trend of the matrix TOC content with the increase of the depth of the soil layer was not obvious; the carbon sequestration ability of the local natural soil and sludge medium was better; and the sludge medium was the most suitable plant growth because of the good nutritional conditions and high water content. There was no significant difference in TOC content among the three plants, and the carbon sequestration ability of 2.75kg/m2 yr (0.997 kg/ m ~ 2 路yr) was the best, the carbon sequestration ability was strong, and the fixed amount of CO2 was the highest, and the drought tolerance, cold resistance and production of Ophiopogon japonicus and Dryopteris were weak. The plants and matrix of green roof have considerable carbon sequestration ability, and they are an ideal carbon sequestration system. 4.7kg/ m ~ 2 路yr, that is, 190.5kg / yr.2. Reasonable design and construction of green roof can achieve safe and reliable, low-carbon environmental protection, the overall beautiful function. By comparing the temperature change of each monitoring point, it can be seen that the effect of green roof cooling (1.2 鈩，
本文编号：2504182
[Abstract]:Chengdu Municipal Government puts forward the construction of a "modern pastoral city" with the harmonious integration of man and nature and the integration of urban and rural areas, and the construction of green roof is one of the contents of the construction of modern pastoral city. At present, the ecological and environmental benefits of green roofs and the positive role of social and economic benefits in the development of low-carbon society have been recognized, but the relevant basic data are still very limited, which restricts the promotion of green roofs and affects the development of modern pastoral cities. This paper mainly discusses the structural design of green roof in modern pastoral cities, the selection of matrix and plant configuration and carbon sequestration, and analyzes the energy saving of green roof and the benefit of carbon dioxide (CO2) emission reduction. The main conclusions are as follows: 1. Three kinds of native plants (Ophiopogon japonicus, Dryopteris, Ligustrum lucidum) and three kinds of matrix (waste slag medium (treated slag with particle size less than 3mm), local natural soil and sludge medium (sludge mixed with local natural soil) were selected and applied to green roof for one year. The results showed that the (TOC) content of organic carbon in the three matrices was high and at the medium level; due to the limited thickness of the matrix layer, the decrease trend of the matrix TOC content with the increase of the depth of the soil layer was not obvious; the carbon sequestration ability of the local natural soil and sludge medium was better; and the sludge medium was the most suitable plant growth because of the good nutritional conditions and high water content. There was no significant difference in TOC content among the three plants, and the carbon sequestration ability of 2.75kg/m2 yr (0.997 kg/ m ~ 2 路yr) was the best, the carbon sequestration ability was strong, and the fixed amount of CO2 was the highest, and the drought tolerance, cold resistance and production of Ophiopogon japonicus and Dryopteris were weak. The plants and matrix of green roof have considerable carbon sequestration ability, and they are an ideal carbon sequestration system. 4.7kg/ m ~ 2 路yr, that is, 190.5kg / yr.2. Reasonable design and construction of green roof can achieve safe and reliable, low-carbon environmental protection, the overall beautiful function. By comparing the temperature change of each monitoring point, it can be seen that the effect of green roof cooling (1.2 鈩，
本文编号：2504182
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