中文摘要：

通过室内模拟试验,研究黑土团聚体添加小麦秸秆对CO2释放速率和累积释放量的影响,探讨添加小麦秸秆对各粒级土壤团聚体碳的激发效应。利用湿筛的方法获得6个级别的团聚体,分别加入5%和10%土壤重量的小麦秸秆进行培养。结果表明：各团聚体土壤释放CO2的速率相似,与是否添加小麦秸秆无关。添加5%小麦秸秆后的第7,21,35天,呼吸速率增加量分别为未添加处理的2.41∽4.42倍、0.84∽1.50倍和0.72∽2.65倍。而添加10%小麦秸秆的土壤,培养前期,CO2释放速率显著大于5%的处理（P〈0.05）,后期趋于一致。添加5%小麦秸秆比10%处理对团聚体碳激发作用大,表现出来的规律为：（〉2mm）〉0.25∽0.5mm〉0.053∽0.25mm〉0.5∽1.0mm〉1∽2mm〉（〈0.053）mm。这些结果表明,通过湿筛方法获得的团聚体,外源碳对其有机碳的激发作用与团聚体碳含量和C/N无显著关系,而主要取决于团聚体对有机碳的保护作用及微生物与团聚体碳的接触机会。

英文摘要：

To discuss the priming effect of wheat straw addition on organic carbon mineralization in aggregates, an incubation experiment was conducted with adding 5%and 10% wheat straw to six size aggregates. The CO2 flux rate and cumulative CO2 emission were measured. Results showed that similar CO2 flux across various aggregate sizes, which was not related with wheat straw addition or not. At the 7, 21 and 35 days af- ter 5% wheat straw added, the soil respiration rate increased by 2.41--4.42, 0.84--1.50 and 0.72--2.65 times compared to control. However, the adding 10% wheat straw showed larger CO2 flux than 5% treat- ment, then tended to similar with time. The priming effect induced by 5 % wheat straw addition was larger than 10% addition treatment, and in an order of （〉2 mm）〉0.25--0.5 mm〉0. 053--0.25 mm〉0.5--1.0 mm〉1--2 mm〉（〈0. 053 mm）. All these suggested that there were no relationship between priming effect induced by exogenous C addition and C content, C/N in aggregate after wet-sieving, but related with the physical protection and whether the microorganism could contact to aggregate carbon.