| 摘要: |
| 缓解大气颗粒物污染、营造清洁健康的城市环境是中国绝大部分城市须解决的问题之一。城市绿地能有效缓解PM2.5，然而当前对绿地空间形态的研究不足，导致能在规划设计中直接应用的成果不多。基于武汉市9个城市绿地空间形态要素量化差异与实地测量的PM2.5浓度大小，探索二者深层的量化关系规律。结果显示：1）PM2.5消减量随绿地规模的增加呈增长趋势，当规模大于5~10 hm2消减量减缓；2）绿地面积、周长及形状指数与PM2.5的消减量显著正相关，分维指数与近圆形形状指数相关性不显著；3）PM2.5的消减效率随绿地规模的增加急剧下降，当绿地规模超过5~10 hm2，消减效率变化不明显。通过量化分析，揭示对PM2.5消减具有显著影响的城市绿地空间形态指标，提出适当的规模、不规则或复杂的绿地形态及分散式的布局等绿地优化策略。 |
| 关键词: 风景园林 城市绿地 空间形态 PM2.5 |
| DOI：10.14085/j.fjyl.2019.12.0074.05 |
| 分类号:TU986 |
| 基金项目:国家自然科学基金（编号 51778254，51538004） |
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| Influence of Urban Green Space Forms on PM2.5 Reduction:A Case Study of Wuhan |
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CHEN Ming1, HU Yi2, DAI Fei*1
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1.Huazhong University of Science and Technology;2.Hangzhou Green Town Asian Games Village Development Co., Ltd
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| Abstract: |
| Alleviating the pollution of atmospheric particles and creating a clean and healthy urban environment is one of the problems to be solved in most cities in China. Urban green space can effectively reduce the PM2.5. However, the research on the spatial forms of green space is insufficient, which leads to few achievements that can be directly applied in planning and design. Based on the quantitative difference of spatial morphological elements and field measurement of PM2.5 concentration of nine urban green spaces in the city of Wuhan, this study exlpores the deep quantitative relationship between green spaces and PM2.5. The results show that: 1) the decrease of PM2.5 increases with the expansion of the green space scale. The reduction will slow down when the scale is larger than 5~10 hm2; 2) The area, perimeter and shape index of the green space are positively correlated with the reduction of PM2.5. The fractal dimension index and the related circumscribing circle have no significant correlation. 3) The reduction efficiency of PM2.5 decreases sharply with the increase in the green space scale. The reduction efficiency is not obvious when the scale of green space exceeds 5~10 hm2. Through quantitative analysis, this paper reveals the spatial morphology index of urban green space, which has a significant impact on PM2.5 reduction, and puts forward some green space optimization strategies, such as appropriate scale, irregular or complex green space forms and decentralized layout. |
| Key words: landscape architecture urban green space spatial form PM2.5 |
| 引用本文: | 陈明,胡义,戴菲*.城市绿地空间形态对PM2.5的消减影响——以武汉市为例[J].风景园林，2019，26（12）：74-78. |
| CHEN Ming,HU Yi,DAI Fei*.Influence of Urban Green Space Forms on PM2.5 Reduction:A Case Study of Wuhan[J].Landscape Architecture Journal, 2019, 26(12):74-78. |
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