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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (4): 1213-1220.doi: 10.13287/j.1001-9332.202104.007

• Original Articles • Previous Articles     Next Articles

Effects of simulated acid rain on soil N2O emission from typical forest in subtropical sou-thern China.

CAO Ya-ling1,2, YU Meng-xiao1, JIANG Jun1, CAO Nan-nan1,2, ZHAO Meng-di1,2, WANG Chen1, ZHANG De-qiang1, YAN Jun-hua1*   

  1. 1Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;
    2University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-10-02 Accepted:2021-01-27 Published:2021-10-25
  • Contact: *E-mail: jhyan@scib.ac.cn
  • Supported by:
    Strategic Priority Research Program of Chinese Academy of Sciences (XDA13010302), the National Science Fund for Distinguished Young Scholars (41825020), the National Natural Science Foundation of China (31901296), and the China Postdoctoral Science Foundation (2020M672863).

Abstract: Based on a long-term simulated acid rain experiment, soil N2O emission fluxes were measured using static chambers and the gas chromatography method in a coniferous and broadleaved mixed forest and a monsoon evergreen broadleaved forest in southern China. During the five-year observation periods (2014-2018), soil N2O emission fluxes in the two forests showed obvious seasonal variation. The soil N2O emission fluxes in wet season were significantly higher than that in dry season, with a large annual variation. Due to the decreases of precipitation, soil N2O emission fluxes of the two forests in 2017 and 2018 were generally low. Soil N2O emission flux was positively correlated with soil temperature and soil moisture. In the monsoon evergreen broadleaved forest, soil N2O emission flux in the control plot was 12.6 μg N2O·m-2·h-1. Soil N2O emission fluxes under the pH 3.5 and pH 3.0 treatments increased by 42.9% and 61.1%, respectively. Soil N2O emission was significantly increased under simulated acid rain in the monsoon evergreen broadleaved forest. Acid rain promoted soil N2O emission in the coniferous and broadleaved mixed forest, but without significant difference among the treatments. Under the scenario of increasing acid rain, soil N2O emission fluxes in typical subtropical southern China forests would increase, and the magnitude of such increase was different among forest types.

Key words: soil N2O emission, simulated acid rain, subtropical southern China forest