| 放牧强度对典型草原温室气体排放的影响 |
| 摘要点击 1055 全文点击 198 投稿时间：2024-01-08 修订日期：2024-04-12 |
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| 中文关键词 放牧强度 温室气体 典型草原 土壤含水量 土壤温度 |
| 英文关键词 grazing intensity greenhouse gas typical grassland soil water content soil temperature |
| 作者 | 单位 | E-mail | | 吴越强 | 内蒙古大学生态与环境学院, 草原生态安全省部共建协同创新中心, 呼和浩特 010021 | 2427814089@qq.com | | 马文红 | 内蒙古大学生态与环境学院, 草原生态安全省部共建协同创新中心, 呼和浩特 010021
蒙古高原生态学与资源利用教育部重点实验室, 呼和浩特 010021 | | | 李智勇 | 内蒙古大学生态与环境学院, 草原生态安全省部共建协同创新中心, 呼和浩特 010021
蒙古高原生态学与资源利用教育部重点实验室, 呼和浩特 010021 | | | 祁乐 | 内蒙古大学生态与环境学院, 草原生态安全省部共建协同创新中心, 呼和浩特 010021
蒙古高原生态学与资源利用教育部重点实验室, 呼和浩特 010021 | qile@imu.edu.cn |
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| 中文摘要 |
| 不同放牧强度对典型草原生态系统温室气体排放影响的研究,对于制定草原生态系统适应性管理策略和内蒙古地区“双碳”目标实现起到重要作用. 为探究不同放牧强度对典型草原生态系统温室气排放的影响,设置了不放牧（CK）、轻度放牧（LG）、中度放牧（MG）和重度放牧（HG）这4种处理,利用静态暗箱-红外光谱法测定其温室气体排放通量. 结果表明：①生态系统呼吸和CH4排放通量存在明显的季节变化；HG处理较CK处理显著降低了生态系统呼吸排放总量的31.43%,CH4排放总量各处理间均不显著,HG处理较LG处理显著降低了N2O排放总量的94.03%（P < 0.05）；②各处理的生态系统呼吸对数值均与土壤温度呈现极显著线性相关关系（P < 0.001）,CK和HG处理下的生态系统呼吸与土壤含水量呈显著线性关系（P < 0.05）,且主要受土壤温度的影响. 除LG处理,其余处理的CH4排放通量均与土壤温度呈现二次相关关系,各处理的CH4排放通量均与土壤含水量线性相关（P < 0.01）,且主要受土壤含水量的影响；LG下N2O排放通量与土壤温度显著线性相关（P < 0.05）；③与CK相比,HG处理显著降低了土壤含水量、土壤总碳（TC）、总氮（TN）及植被的地上地下生物量和凋落物量,显著增加了土壤温度和土壤容重（BD）（P < 0.05）；重度放牧虽然降低了草原生态系统的碳排放,但是也降低了植被生物量和土壤碳氮养分,因此不利于维持草地的生态平衡. 研究结果为评估放牧对草原生态系统源汇功能的影响提供了数据参考和理论支撑. |
| 英文摘要 |
| The research investigating the effects of different grazing intensities on greenhouse gas emissions within typical steppe ecosystems aids in formulating effective management strategies for these ecosystems. Furthermore, it plays a vital role in developing approaches to reduce greenhouse gas emissions. To investigate the effects of different grazing intensities on greenhouse gas emissions in typical steppe ecosystems, four treatments were established： no grazing （CK）, light grazing （LG）, moderate grazing, and heavy grazing （HG）. The greenhouse gas emission fluxes were measured using the static dark chamber infrared spectroscopy method. The results showed that： ① Significant seasonal changes exist in ecosystem respiration and CH4 emission flux. Compared with the CK treatment, the HG treatment significantly reduced the total ecosystem respiration emission by 31.43%, while the total CH4 emission was not significant among all treatments. Compared with the LG treatment, the HG treatment significantly reduced the total N2O emission by 94.03% （P <0.05）. ② A significant linear correlation exists between the values of ecosystem respiration pairs and soil temperature （P <0.001）, and there was a significant linear relationship between ecosystem respiration and soil water content under the CK and HG treatments （P <0.05）, mainly related to soil temperature. Except for the LG treatment, the CH4 emission fluxes of the other treatments showed a quadratic correlation with soil temperature, and the CH4 emission fluxes of all treatments were linearly correlated with soil water content and were mainly correlated with soil water content （P <0.01）. A significant linear correlation exists between N2O emission flux and soil temperature in the LG treatment （P <0.05）. ③ Compared with that in CK, the HG treatment significantly decreased soil water content, soil total carbon, soil total nitrogen, vegetation aboveground biomass, and litter, and significantly increased soil temperature and soil bulk density （P <0.05）. Heavy grazing reduced the total greenhouse gas emissions and total vegetation biomass. Although it reduced the carbon emissions of the grassland ecosystem, it was not conducive to maintaining the ecological balance of grassland. This study can provide reference data and theoretical support for evaluating the effects of grazing on the source-sink functions of grassland ecosystems. |
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