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OALib Journal期刊
ISSN: 2333-9721
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典型草原恢复与退化群落土壤呼吸的特征研究
, PP. 600-608
Keywords: 生长季,非生长季,过渡放牧,温度相关性
Abstract:
土壤呼吸是生态系统碳循环的重要组成部分,本研究针对内蒙古典型草原退化与恢复群落,测定了其在生长季和非生长季的土壤呼吸日动态变化.研究表明:退化群落平均土壤呼吸约是恢复群落的50%;非生长季co2的排放速率最高约为生长季的10%.恢复群落土壤呼吸速率与温度呈显著正相关,与土表温度的相关性最高;退化群落的相似特征仅在非生长季出现.过度放牧导致的植被退化是土壤呼吸速率降低的原因.植被退化改变了群落土壤呼吸对环境变化的响应模式,影响非生长季土壤呼吸的因素及其权重与生长季相比发生明显变化.本研究对于了解土地利用变化对于碳释放的影响具有一定的科学意义,对天然草地可持续管理也有积极的意义.
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