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中文摘要：
土壤呼吸的测定对于预测不同生态系统碳收支起着关键性作用。本研究利用Li-8100开路式碳通量测定系统,对内蒙古荒漠草原、典型草原和草甸草原生态系统在不同放牧强度（零放牧的对照、轻度放牧、中度放牧和重度放牧）下土壤呼吸速率进行测定,并分析了土壤呼吸与土壤温度（10cm处）和空气相对湿度的相关性。结果表明,草地类型、放牧强度及它们的交互作用都对土壤呼吸有显著影响（P〈0.05）,放牧强度对土壤呼吸的影响主要表现在荒漠草原和典型草原生态系统,对草甸草原没有显著影响。在不同草地生态系统中,随着放牧强度的增加,土壤呼吸速率呈先升高后降低的变化规律。方差结果显示,不同草原类型的土壤10cm温度和空气相对湿度有极显著性的差异（P〈0.001）,不同放牧强度对土壤10cm温度和空气相对湿度无显著性影响。
英文摘要：
Determination of soil respiration plays a key role in the assessment of carbon budgets in different ecosystems.Soil respiration rates under four different grazing intensities（no grazing,light grazing,moderate grazing and heavy grazing） were measured in desert steppe,typical steppe and meadow steppe in Inner Mongolia using a Li-8100 open circuit soil C Flux measuring system.Regression analyses were done between soil respiration and soil temperature（at 10 cm depth of soil）,as well as soil respiration and air relative humidity.The grassland type,grazing intensity and their interaction had significant effects on soil respiration.The effect of grazing intensity on soil respiration was significant in desert steppe and typical steppe,but not significant in meadow steppe.In different grasslands,as grazing intensity increased,the soil respiration initially increased but then decreased.Variance analysis showed that there were significant differences in soil temperature at 10 cm depth of soil and in air relative humidity among different grassland types,but no differences were found between different grazing intensities.
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