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Moderate grazing reduces while mowing increases greenhouse gas emissions from a steppe grassland: Key modulating function played by plant standing biomass

文献类型： 外文期刊

作者： Wang, Hao 1 ; Li, Yanlong 1 ; Zhang, Junzheng 1 ; Zhang, Tongrui 1 ; Wang, Yadong 1 ; Li, Frank Yonghong 1 ;

作者机构： 1.Inner Mongolia Univ, Collaborat Innovat Ctr Grassland Ecol Secur, Sch Ecol & Environm, Minist Educ, Hohhot 010021, Peoples R China

2.Inner Mongolia Univ, Sch Ecol & Environm, Key Lab Ecol & Resource Use Mongolian Plateau, Minist Educ, Hohhot 010021, Peoples R China

3.Inner Mongolia Univ, Sch Ecol & Environm, Inner Mongolia Key Lab Grassland Ecol, Hohhot 010021, Peoples R China

4.Inner Mongolia Agr Univ, Sch Life Sci, Hohhot 010021, Peoples R China

5.Chinese Acad Agr Sci, Inst Grassland Res, Hohhot 010021, Peoples R China

关键词： Ecosystem respiration; Methane; Nitrous oxide; Steppe; Grazing; Mowing

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：8.4； 五年影响因子：8.6 ）

ISSN： 0301-4797

年卷期： 2025 年 374 卷

页码：

收录情况： SCI

摘要： Grassland represents one of the most expansive terrestrial ecosystems, exerting a profound influence on atmospheric greenhouse gas (GHG) levels within the broader context of global change. Both climate and land use changes play important roles in modulating grassland GHG emissions by directly or indirectly altering soil physical and chemical properties, especially soil temperature and inorganic nitrogen content. The optimal grassland management practices need to simultaneously meet the requirements of reducing GHG emissions, maintaining biological biodiversity, and ensuring productivity. However, the information on the management effects on GHG emissions from natural grasslands is still insufficient. Here we conducted a six-year grazing and mowing experiment in a semi-arid steppe grassland in central Inner Mongolia, and employed the static chamber method to investigate the effects of three major management measures, fencing, grazing and mowing, on ecosystem respiration (CO2 emission), methane uptake (CH4), and nitrous oxide emission (N2O) patterns in the experimental grassland. The results demonstrated that: (i) moderate grazing reduced plant aboveground standing biomass and CO2 emissions, but promoted belowground nutrient cycling and CH4 uptake; (ii) mowing enhanced plant biomass production, increased soil carbon and nitrogen content, and also increased CO2 emission; (iii) reducing grazing frequency reduced plant biomass loss and N2O emissions. We conclude that grazing at a moderate intensity and frequency is the best for mitigating GHG emissions while maintaining grassland production, and that mowing enhancement of plant production and GHG emissions should be considered in optimizing grassland management.

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