Interaction of spatial sulfur patterns between urban air and woody species of the Pearl River Delta, southern China
2020
Pei, Nancai | Zhu, Yingfang | Shi, Xin | Sun, Bing | Liao, Juyang | Liu, Yan | Li, Feifan
Sulfur (S) uptakes by woody plants might indicate the presence of urban air pollution in the form of sulfur dioxide (SO₂), which is one of the most important pollutants worldwide. The present study detected total carbon (C) and S contents in the leaf and stem (dry mass) of 53 common woody species in representative forest plots in five cities across the Pearl River Delta (PRD), a densely urbanized region in Southern China. Coupling analysis explored whether spatial patterns of S content in woody species were relatively consistent with atmospheric SO₂ concentration in the five PRD cities. Total S content varied in leaves and stems with averages of 2.0 g/kg and 0.8 g/kg, respectively, while air SO₂ concentration ranged from 9.0 to 108.0 g/m³. However, total C content was relatively constant among all the species across the diverse forest plots, with an average of 443.5 g/kg and a median of 448.0 g/kg in leaves and 437.0 g/kg in stems. This suggests that air SO₂ pollution did not influence tree growth, so afforestation may be an effective method of eliminating urban air pollution in the PRD.
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