文献类型： 外文期刊

作者： Lin, Lin ¹ ; Yan, Jingli ¹ ; Chen, Guojian ¹ ; Tang, Rongli ¹ ; Bao, Le ¹ ; Ma, Keming ¹ ; Zhou, Weiqi ¹ ; Yuan, Xiu ⁶ ; Yin ¹ ;

作者机构： 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China

2.Univ Calif Riverside, Dept Bot & Plant Sci, 900 Univ Ave, Riverside, CA 92521 USA

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

4.Chongqing Acad Agr Sci, Chongqing, Peoples R China

5.Beijing Forest Univ, Coll Soil & Water Conservat, Beijing 100083, Peoples R China

6.Chinese Acad Sci, Inst Sci & Dev, Beijing, Peoples R China

关键词： Air pollution; Magnification; Urban plant; Biomonitor; Object-based classification; Ecosystem service

期刊名称：MICRON （ 影响因子：2.5； 五年影响因子：2.2 ）

ISSN： 0968-4328

年卷期： 2018 年 115 卷

页码：

收录情况： SCI

摘要： The metrics used to quantify the particles on the leaf surface can serve as indicators for the quality of the atmospheric environment and is employed to evaluate the ecosystem services that plants can provide. Magnification of an SEM image may affect the recognition of particles in various aspects, yet little research has examined the impact. In this study, images were obtained at magnifications of 500 x, 1000 x, 2000 x, and 5000 x for a widely planted vegetation fence species in Beijing: Euonymus japonicas. Particle amount per leaf area increased as magnification increased; the percentage of the leaf area covered by particles was a relatively stable index across magnifications at around 7% except for the magnification 2000 x which was around 15%; and the weight of particles per leaf area was unstable over all magnifications. The mean area of each particle decreased from 5.68 mu m(2) at magnification 500 x to 0.20 at magnification 5000 x, and shape complexity increased as magnification increased from 1.29 at magnification 500 x to 1.50 at magnification 5000 x. Particles with a diameter of less than 2.5 mu m are more sensitive to scale than particles with a diameter greater than 2.5 mu m of judged by the differences of the characteristics, diameter, area and shape index, of particles with different diameter ranges over four magnifications. Regarding the percentage characteristic, the percentage of particles with a diameter smaller than 1 pm increased as the magnification increased and accounted for 46% at magnification 500 x and 96% at magnification 5000 x. The percentage of particles with an area smaller than 1 mu m(2) also increased as the magnification increased accounting for 56% at magnification 500 x and 99% at magnification 5000 x. Particles with shape index between 1-1.5 accounted for most of the particles across all four magnifications of which the percentage was 0.66-0.80. Therefore, when comparing the results from different magnifications, three factors should be considered carefully: magnification, quantification index, and particle size range. The revealed relationship of the factors can facilitate the understanding of the metrics as indicators for atmospheric environments and vegetation as a sink for atmospheric particles to improve the urban environment.