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Assessing the composition, diversity, and allergenic risk of street trees in Qingyang District of Chengdu City
Urban Forestry & Urban Greening ( IF 6.0 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ufug.2020.126747 Hua Zong , Manqing Yao , Yuqian Tang , Han Chen
Urban Forestry & Urban Greening ( IF 6.0 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ufug.2020.126747 Hua Zong , Manqing Yao , Yuqian Tang , Han Chen
Abstract The growing evidences suggest an association between street green space and health in cities. Pollen released by street trees has a considerable adverse impact on human health. This study aims to analyze the characteristics and assess the seasonally allergenic risk of street trees in Qingyang District, Chengdu City. There are 495 streets in Qingyang District, which have been divided into five categories according to their width. Fifty-seven species were identified, belonging to 46 taxa, and 28 botanical families in these streets. However, no significant differences in average diameter at breast height (DBH), tree height, and crown width of street trees were found among the five defined street categories. Both the street trees per capita (0.06) and the number of tree species are significantly higher than that in many Chinese cities. The Shannon's diversity index (SHDI) of street categories are clearly different, ranging from 0.94 to 3.84. Street category 5 (community street) has the highest tree density, area ratio, and SHDI of all street categories. In addition, Chengdu City is exposed to high allergenic risk of street trees. The index of urban green zone allergenicity (IUGZA) ranged from a minimum of 0.1002 for category 1 (urban expressway) to a maximum of 1.0391 for category 5, which indicates that the IUGZA value of different urban green spaces can exceed the upper limit (1.00). A increasing trend of the IUGZA values is observed with decreasing street width. The highest allergic risk of street trees is observed in spring, followed by summer. Ginkgo biloba shows a highly contribute to the IUGZA value for all street categories. Pearson’s correlation analysis identified area ratio and tree density, as crucial factors that affect the IUGZA. No correlation was observed between IUGZA scores and species richness (i.e., SHDI and the total number of species). A series of greening strategies have been proposed to minimize the volume of allergen production for the well-being of inhabitants in Chengdu City.
更新日期：2020-10-01
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