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OALib Journal期刊
ISSN: 2333-9721
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内蒙古羊草草原呼吸的影响因素分析和区分
DOI: 10.11821/xb201009003, PP. 1058-1068
Keywords: 羊草草原,生态系统呼吸,土壤呼吸,土壤微生物呼吸,内蒙古
Abstract:
利用静态暗箱-气相色谱法在植物生长旺季测算了内蒙古锡林河流域羊草草原的土壤微生物呼吸、土壤呼吸和生态系统呼吸。地温和水分是植物生长旺季呼吸最重要的影响因素。地温在水分条件适宜的情况下可以解释CO2通量的部分变化(R2=0.376~0.655)。土壤水分含量也可以解释土壤呼吸和生态系统呼吸的部分变化(R2=0.314~0.583)，但基本不能解释土壤微生物呼吸的变化(R2=0.063)。即使在较高温度下，较低的土壤水分含量(≤5%)也会显著的抑制CO2排放。长期干旱后降雨使CO2通量在高温下迅速增大。基于5cm地温和0~10cm土壤水分含量的双变量模型可以解释CO2通量约70%的变化。观测期间，土壤呼吸占生态系统呼吸的比例介于47.3%~72.4%之间，平均为59.4%；根呼吸占土壤呼吸的比例介于11.7%~51.7%之间，平均为20.5%。由于植物体去除引起的土壤水分含量上升可能使我们对土壤呼吸占生态系统呼吸比例的估计略微偏高，根呼吸占土壤呼吸的比例略微偏低。
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