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Evaluation of the impacts of ozone on the vegetation productivity of woodland and grassland ecosystems in China

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  • Qinyi, WANG
  • Mei, HUANG
  • Shaoqiang, WANG
  • Bin, CHEN
  • Zhenhai, LIU
  • Zhaosheng, WANG
  • Shiliang, CHEN
  • Hui, LI
  • Tongtong, ZHU
  • Donghui, LI
  • Yuelin, LI
  • Hu, Lin
  • Leigang, Sun

Abstract

In the context of global warming, with the increasing tropospheric ozone concentration and the obvious trend of aridity, terrestrial ecosystems are experiencing multiple pressures. However, there are still many uncertainties in modeling the effects of ozone on ecosystem productivity. In this study, an ozone uptake module was coupled to the BEPS (Boreal Ecosystem Productivity Simulator) model, and the new version, the BEPS-O3 model, was used to simulate the impacts of ozone on the gross primary productivity (GPP) of woodland and grassland ecosystems in China. Observational data from four sites were used to verify and improve the models, namely, DXG (grassland), HBG (shrub), DHS (evergreen broad-leaved) and CBS (coniferous forest). The regional results show that the total GPP of forest, grassland and shrub in China was 3.62 Pg C, 0.75 Pg C 0.33 Pg C in 2016, respectively. The GPP loss of forests, grasslands and shrubs caused by ozone was 2.8% and 1.1% and 1.5% of the GPP in woodland and grassland ecosystems, respectively (excluding farmland). Subtropical regions experienced the worst GPP losses, although ozone concentrations were not high. However, higher stomatal conductance leads to higher ozone absorption. By comparing the parameters of previous studies, we conclude that the ozone uptake function was better than the ozone exposure function in modeling. Furthermore, the selection of the ozone uptake function will have a significant impact on the final simulation results, especially for grassland.

Suggested Citation

  • Qinyi, WANG & Mei, HUANG & Shaoqiang, WANG & Bin, CHEN & Zhenhai, LIU & Zhaosheng, WANG & Shiliang, CHEN & Hui, LI & Tongtong, ZHU & Donghui, LI & Yuelin, LI & Hu, Lin & Leigang, Sun, 2023. "Evaluation of the impacts of ozone on the vegetation productivity of woodland and grassland ecosystems in China," Ecological Modelling, Elsevier, vol. 483(C).
    • Handle: RePEc:eee:ecomod:v:483:y:2023:i:c:s0304380023001576
    DOI: 10.1016/j.ecolmodel.2023.110426
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    References listed on IDEAS

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    1. S. Sitch & P. M. Cox & W. J. Collins & C. Huntingford, 2007. "Indirect radiative forcing of climate change through ozone effects on the land-carbon sink," Nature, Nature, vol. 448(7155), pages 791-794, August.
    2. Nadine Unger & Yiqi Zheng & Xu Yue & Kandice L. Harper, 2020. "Mitigation of ozone damage to the world’s land ecosystems by source sector," Nature Climate Change, Nature, vol. 10(2), pages 134-137, February.
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    Keywords

    Ozone; Grassland; Shrub; Forest; POD;
    All these keywords.

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