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应用生态学报 ›› 2021, Vol. 32 ›› Issue (4): 1213-1220.doi: 10.13287/j.1001-9332.202104.007

• 研究论文 • 上一篇    下一篇

模拟酸雨对南亚热带典型森林土壤N2O排放的影响

曹亚玲1,2, 俞梦笑1, 江军1, 曹楠楠1,2, 赵梦頔1,2, 王琛1, 张德强1, 闫俊华1*   

  1. 1中国科学院华南植物园, 退化生态系统植被恢复与管理重点实验室, 广州 510650;
    2中国科学院大学, 北京 100049
  • 收稿日期:2020-10-02 接受日期:2021-01-27 发布日期:2021-10-25
  • 通讯作者: *E-mail: jhyan@scib.ac.cn
  • 作者简介:曹亚玲, 女, 1993年生, 硕士研究生。主要从事全球变化生态学研究。E-mail: cyaling@scbg.ac.cn
  • 基金资助:
    中国科学院战略性先导科技专项(XDA13010302)、国家杰出青年科学基金项目(41825020)、国家自然科学基金项目(31901296)和中国博士后科学基金项目(2020M672863)资助

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).

摘要: 基于长期模拟酸雨森林样地,利用箱式法同步测定了不同酸雨强度处理下森林土壤N2O排放通量,研究了模拟酸雨对我国南亚热带针阔叶混交林和季风常绿阔叶林两种代表性森林土壤N2O排放的影响。结果表明: 连续5年(2014—2018年)观测周期内,两种林型土壤N2O排放通量在各模拟酸雨处理下均表现出明显的季节变化特征,湿季排放通量高于干季,并且年际变化较大。受2017—2018年度降水减少的影响,此期间两种林型土壤N2O排放通量普遍较低。两种林型土壤N2O排放通量与土壤温度和土壤湿度呈显著正相关。季风常绿阔叶林对照样方土壤N2O排放通量为12.6 μg N2O m-2·h-1,与对照相比,pH 3.5和pH 3.0条件下土壤N2O排放通量分别上升42.9%和61.1%,模拟酸雨显著增加了季风常绿阔叶林土壤N2O排放通量;模拟酸雨同样有促进针阔叶混交林土壤N2O排放的趋势,但各处理间差异不显著。在酸雨依旧严峻的形势下,我国南亚热带典型森林土壤N2O排放通量将增加,且不同林型的增幅不同。

关键词: 土壤N2O排放, 模拟酸雨, 南亚热带森林

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