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The Impact of Impervious Surface Expansion on Soil Organic Carbon: A Case Study of 0–300 cm Soil Layer in Guangzhou City

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  • Jifeng Du

    (Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
    School of Public Administration, South China Agricultural University, Guangzhou 510642, China)

  • Mengxiao Yu

    (Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China)

  • Junhua Yan

    (Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China)

Abstract

Empirical evidence shows that the expansion of impervious surface threatens soil organic carbon (SOC) sequestration in urbanized areas. However, the understanding of deep soil excavation due to the vertical expansion of impervious surface remains limited. According to the average soil excavation depth, we divided impervious surface into pavement (IS 20 ), low-rise building (IS 100 ) and high-rise building (IS 300 ). Based on remote-sensing images and published SOC density data, we estimated the SOC storage and its response to the impervious surface expansion in the 0–300 cm soil depth in Guangzhou city, China. The results showed that the total SOC storage of the study area was 8.31 Tg, of which the top 100 cm layer contributed 44%. The impervious surface expansion to date (539.87 km 2 ) resulted in 4.16 Tg SOC loss, of which the IS 20 , IS 100 and IS 300 contributed 26%, 58% and 16%, respectively. The excavation-induced SOC loss (kg/m 2 ) of IS 300 was 1.8 times that of IS 100 . However, at the residential scale, renovating an IS 100 plot into an IS 300 plot can substantially reduce SOC loss compared with farmland urbanization. The gains of organic carbon accumulation in more greenspace coverage may be offset by the loss in deep soil excavation for the construction of underground parking lots, suggesting a need to control the exploitation intensity of underground space and promote residential greening.

Suggested Citation

  • Jifeng Du & Mengxiao Yu & Junhua Yan, 2021. "The Impact of Impervious Surface Expansion on Soil Organic Carbon: A Case Study of 0–300 cm Soil Layer in Guangzhou City," Sustainability, MDPI, vol. 13(14), pages 1-17, July.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:14:p:7901-:d:594719
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    References listed on IDEAS

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    1. Jillian W. Gregg & Clive G. Jones & Todd E. Dawson, 2003. "Urbanization effects on tree growth in the vicinity of New York City," Nature, Nature, vol. 424(6945), pages 183-187, July.
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    Cited by:

    1. Kikuko Shoyama & Rajarshi Dasgupta & Ronald C. Estoque, 2022. "Ecosystem Service and Land-Use Changes in Asia: Implications for Regional Sustainability," Sustainability, MDPI, vol. 14(21), pages 1-4, November.

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