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中国沙漠 ›› 2025, Vol. 45 ›› Issue (2): 184-190.DOI: 10.7522/j.issn.1000-694X.2024.00121

• • 上一篇    

草地土壤N2O排放对人为干扰的响应研究进展

方海富1,2,3(), 陈翔4, 杨红玲1,2,3, 程莉1,2,3, 李玉霖1,2()   

  1. 1.中国科学院西北生态环境资源研究院 奈曼沙漠化研究站 /,甘肃 兰州 730000
    2.干旱区生态安全与可持续发展重点实验室,甘肃 兰州 730000
    3.中国科学院大学,北京 100049
    4.国家草业技术创新中心(筹),内蒙古 呼和浩特 010070
  • 收稿日期:2024-10-31 修回日期:2024-12-12 出版日期:2025-03-20 发布日期:2025-03-26
  • 通讯作者: 李玉霖
  • 作者简介:方海富(1994—),男,甘肃庆阳人,博士研究生,主要从事土壤生态学研究。E-mail: haifufang@126.com
  • 基金资助:
    国家草业技术创新中心(筹)项目(CCPTZX2023B02-2);内蒙古自治区防沙治沙科技创新重大示范工程“揭榜挂帅”项目(2024JBGS0005-2);甘肃省青年科技基金项目(23JRRA671)

A review of response of nitrous oxide emissions to anthropogenic perturbation in grassland soil

Haifu Fang1,2,3(), Xiang Chen4, Hongling Yang1,2,3, Li Cheng1,2,3, Yulin Li1,2()   

  1. 1.Naiman Desertification Research Station /, Northwest Institute of Eco-Environment and Resource,Chinese Academy of Sciences,Lanzhou 730000,China
    2.Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Northwest Institute of Eco-Environment and Resource,Chinese Academy of Sciences,Lanzhou 730000,China
    3.University of Chinese Academy of Sciences,Beijing 100049,China
    4.National Center of Pratacultural Technology Innovation (under preparation),Hohhot 010070,China
  • Received:2024-10-31 Revised:2024-12-12 Online:2025-03-20 Published:2025-03-26
  • Contact: Yulin Li

摘要:

氧化亚氮(N2O)浓度的上升加剧全球气候变暖。近年来,中国面临草地沙化严重扩张的现象,研究草地土壤N2O排放响应日益增多。然而,人为干扰对草地土壤N2O排放的作用,在土壤理化性质、微生物和环境因子等方面尚缺乏系统研究。因此,本文综述了草地土壤N2O排放对不同干扰因素的响应机制。结果表明:铵态氮(NH4+-N)和硝态氮(NO3--N)是土壤微生物硝化和反硝化的底物。放牧降低可溶性有机质(DOM)对反硝化功能基因和反硝化潜势的作用,导致土壤潜在N2O排放通量降低。刈割降低了沙质草地的土壤温度而使土壤酶活性降低,诱导土壤微生物量和活性降低,抑制微生物呼吸,对土壤氮循环产生影响。火烧对土壤N2O通量的变化与火干扰的强度和持续时间有关。未来的研究应进一步探究其内在机制,为草地科学管理和温室气体减排提供理论支持。

关键词: 草地土壤, 氧化亚氮, 人为干扰

Abstract:

The rise of nitrogen nitrogen (N2O) concentration has exacerbated global warming. In recent years, China has faced the phenomenon of severe expansion of grassland desertification, and the response to the study of grass soil N2O of grassland soil is increasing. However, there is a lack of systematic studies on the changes in N2O emissions from grassland soils due to anthropogenic disturbances in terms of soil physicochemical properties and microorganisms and environmental factors. Therefore, this paper reviews the response mechanisms of grassland soil N2O emissions to different disturbance types. Results showed that: ammonium nitrogen (NH4+-N) and nitric nitrogen (NO3--N) are substrates for soil microbial nitrogen and nitrification. Rather than reducing soluble organic matter (DOM) to restrict nitrifying microorganisms, suppression of functional denitrification genes and denitrification potentials, and eventually lead to a reduction in potential N2O emissions of the soil. Cutting the soil temperature of the sandy grassland and reducing the activity of soil enzymes, inducing soil microorganisms and activity, inhibit the breathing of microorganisms, and affect the soil nitrogen cycle. The change of fire to the flux of soil N2O is related to the intensity and duration of fire interference. Therefore, future research should further explore its internal mechanisms to provide theoretical support for grassland scientific management and greenhouse gas emission reduction.

Key words: grassland soils, nitrous oxide, anthropogenic perturbation

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