Isotopic Composition (delta N-15 and delta O-18) of Urban Forests in Different Climate Types Indicates the Potential Influences of Traffic Exhaust and Relative Humidity
文献类型：期刊论文
| 作者 | Gong, Cheng ; Xian, Chaofan; Ouyang, Zhiyun
|
| 刊名 | FORESTS
 |
| 出版日期 | 2022 |
| 卷号 | 13期号:12页码:2060-1-16 |
| 关键词 | urban forest leaves isotopic composition nitrogen deposition relative humidity |
| 英文摘要 | Previous studies have shown that climatic and anthropogenic factors influence the variations in the stable isotope signature of tree materials in an urban ecosystem. However, the responses of urban trees to various anthropogenic and precipitation interventions are unclear. To fill the research gap, the isotopic composition (delta N-15 and delta O-18) and total nitrogen content of the soil-plant system of urban forests were measured, focusing on typical urban tree species (Populus tomentosa and Ficus virens). The research was done under various land uses in China's Beijing and Shenzhen megacities (with different humidity conditions). The linear mixed-effect model revealed that the delta N-15 values in the leaves of roadside Ficus virens were significantly higher than those in urban park sites, away from the road (delta N-15 difference = 7.2 parts per thousand). In contrast, Populus tomentosa leaves exhibited a non-significant difference (delta N-15 difference = -1.8 parts per thousand). Further regression analysis revealed that the variations in delta N-15 in tree leaves could be attributed to the proximity to highways, suggesting the influence of vehicle exhaust on delta N-15 values in roadside trees. The linear mixed-effect model also revealed delta O-18 values significantly higher in Populus tomentosa leaves than in Ficus virens leaves. To assess the influence of humidity conditions on delta O-18 values in the leaves, the ratio of the atmospheric and intercellular vapor pressures (e(a)/e(i)) of tree canopies was estimated. The result revealed that the e(a)/e(i) of Ficus virens was significantly higher than for Populus tomentosa, ascribed to the variation in the humidity conditions of the two megacities. These results highlight that urban trees can potentially serve as bioindicators for atmospheric pollution and humidity. Our findings highlight the ecophysiological responses of urban forests related to N and O as they vary according to traffic exhaust and relative humidity. Consequently, they are potentially valuable indicators of urban atmospheric contamination, forming a nature-based solution for citizen welfare improvement. |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/48416]  |
| 专题 | 生态环境研究中心_城市与区域生态国家重点实验室 |
| 作者单位 | 1.Research Center for Eco-Environmental Sciences (RCEES) 2.Chinese Academy of Sciences |
| 推荐引用方式 GB/T 7714 | Gong, Cheng,Xian, Chaofan,Ouyang, Zhiyun. Isotopic Composition (delta N-15 and delta O-18) of Urban Forests in Different Climate Types Indicates the Potential Influences of Traffic Exhaust and Relative Humidity[J]. FORESTS,2022,13(12):2060-1-16. |
| APA | Gong, Cheng,Xian, Chaofan,&Ouyang, Zhiyun.(2022).Isotopic Composition (delta N-15 and delta O-18) of Urban Forests in Different Climate Types Indicates the Potential Influences of Traffic Exhaust and Relative Humidity.FORESTS,13(12),2060-1-16. |
| MLA | Gong, Cheng,et al."Isotopic Composition (delta N-15 and delta O-18) of Urban Forests in Different Climate Types Indicates the Potential Influences of Traffic Exhaust and Relative Humidity".FORESTS 13.12(2022):2060-1-16. |
入库方式： OAI收割
来源：生态环境研究中心
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