| 晋北赖草草地生态系统碳通量对不同放牧强度的响应 |
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| 引用本文： | 李昕珂,杨鹤明,王常慧,董宽虎,张晓琳,刁华杰.晋北赖草草地生态系统碳通量对不同放牧强度的响应[J].草地学报,2023,31(3):819-826. |
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| 作者姓名： | 李昕珂 杨鹤明 王常慧 董宽虎 张晓琳 刁华杰 |
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| 作者单位： | 1. 山西农业大学草业学院, 山西 太谷 030801;2. 山西右玉黄土高原草地生态系统国家定位观测研究站, 山西 右玉 037200;3. 草地生态保护与乡土草种质创新山西省重点实验室, 山西 太谷 030801 |
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| 基金项目： | 国家自然科学基金项目（31800381、31872406）；山西农业大学高层次人才专项（2021XG008）；山西省重点实验室项目（202104010910017）资助 |
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| 摘 要： | 草地生态系统是最主要的陆地生态系统之一，其碳循环过程在全球碳平衡中具有重要作用。为探讨草地生态系统碳通量对不同放牧强度的响应，本研究以晋北赖草草地为研究对象，动态监测不放牧、轻度放牧、中度放牧和重度放牧下生态系统净碳交换、生态系统呼吸和生态系统总初级生产力。结果显示，2017年不同放牧强度对生态系统碳通量影响不显著；2018年中度和重度放牧通过改变土壤温度和净初级生产力，一定程度上提高生态系统呼吸和生态系统总初级生产力，但对生态系统净碳交换影响不显著。因此，晋北赖草草地生态系统碳通量对不同放牧强度的响应与放牧年限相关。
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| 关 键 词： | 生态系统呼吸 放牧强度 赖草草地 生态系统总初级生产力 生态系统净碳交换 |
| 收稿时间： | 2022-08-08 |
Responses of Ecosystem Carbon Fluxes to Different Grazing Intensities in Leymus secalinus Grassland of Northern Shanxi |
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| LI Xin-ke,YANG He-ming,WANG Chang-hui,DONG Kuan-hu,ZHANG Xiao-lin,DIAO Hua-jie.Responses of Ecosystem Carbon Fluxes to Different Grazing Intensities in Leymus secalinus Grassland of Northern Shanxi[J].Acta Agrestia Sinica,2023,31(3):819-826. |
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| Authors: | LI Xin-ke YANG He-ming WANG Chang-hui DONG Kuan-hu ZHANG Xiao-lin DIAO Hua-jie |
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| Institution: | 1. College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;2. Youyu Loess Plateau Grassland Ecosystem Research Station, Youyu, Shanxi Province 037200, China;3. Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Taigu, Shanxi Province 030801, China |
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| Abstract: | Grassland ecosystem is one of the most important terrestrial ecosystems, and its carbon cycle processes play an important role in the global carbon balance. In order to explore the response of ecosystem carbon fluxes to different grazing intensities, this study was conducted in Leymus secalinus grassland of northern Shanxi. We dynamically monitored net ecosystem carbon exchange, ecosystem respiration and gross primary productivity under ungrazing, light grazing, moderate grazing and heavy grazing. The results showed that different grazing intensities had no significant effect on ecosystem carbon fluxes in 2017. In 2018, moderate and heavy grazing increased ecosystem respiration and gross primary productivity to some extent by changing soil temperature and net primary productivity, but still had no significant effect on net ecosystem carbon exchange. Therefore, the results of this study indicate that the response of ecosystem carbon fluxes to different grazing intensities is related to grazing years. |
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| Keywords: | Ecosystem respiration Grazing intensities Leymus secalinus grassland Gross primary productivity Net ecosystem carbon exchange |
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