The changes of soil respiration in Phyllostachys edulis forest were measured at six different elevations from 120 m to 640 m. The relationship between the soil respiration and the environmental factors was analyzed by using regression analysis , and the dominant factor was filtered by principal component analysissis. The results showed that soil respirations are significantly different at different altitudes. The soil respiration gradually decreases with the increase of the elevation. Soil respiration has extremely significant correlation with air temperature, soil temperature, atmospheric CO2 concentration and soil moisture, and significant correlation with soil density. But the soil respiration has not significant correlation with the contents of soil organic carbon, total N, available K and available phosphorus. Air temperature and soil temperature are the main factors affecting soil respiration along altitudinal gradients.%对海拔120 ～ 640 m的毛竹林地土壤呼吸变化进行研究,采用回归分析对土壤呼吸与各环境因子间的相关关系进行分析,同时采用主成分分析对土壤呼吸沿海拔梯度变化主导因子进行进一步的筛选.结果表明:毛竹林不同海拔土壤呼吸差异极显著,随着海拔升高,呼吸值逐渐降低；土壤呼吸与空气温度、土壤温度、大气CO2摩尔分数、土壤含水率间存在极显著的相关关系,与土壤密度间存在显著的相关关系,土壤呼吸与土壤有机碳、全氮、速效钾、有效磷质量分数间的相关关系均不显著；空气温度、土壤温度2个因子是影响土壤呼吸沿海拔梯度变化的主因子.
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