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通过室内短期培养实验,利用δ13C的方法研究了外源有机物料分解过程中黑土有机碳的变化规律。结果表明:黑土中添加有机物料后,土壤有机碳的数量明显增加。在有机物料分解过程中,随着培养时间的延长,土壤有机碳的总量在逐渐下降,总的变化趋势是先快后慢,渐趋平缓,到培养结束(30天),有机物料在土壤中净残留率小于50%。黑土有机碳的δ13C值受进入土壤中有机物料的种类所影响,从数量上土壤有机碳的δ13C值可以反映土壤中不同来源有机碳的变化。在小麦秸秆分解过程中,新进入黑土中的有机碳转化较快,而土壤中固有的有机碳转化较慢,添加有机物料可以增加土壤中有机碳的固定。
Through indoor short-term cultivation experiments, the variation of organic carbon in black soil during decomposition of exogenous organic materials was studied by δ13C method. The results showed that the amount of organic carbon in soil increased obviously after adding organic materials into black soil. In the process of decomposition of organic materials, with the extension of incubation time, the total amount of soil organic carbon decreased gradually. The general trend was that the total organic carbon was slowed first and then slowed down gradually. When the cultivation ended (30 days) The net residual rate of less than 50%. The δ13C values of organic carbon in black soil are affected by the types of organic materials entering the soil. The δ13C values of soil organic carbon can reflect the changes of organic carbon in different soil sources. In the process of wheat straw decomposition, the organic carbon newly introduced into black soil is transformed rapidly, while the organic carbon inherently transformed into the soil is relatively slow. Adding organic materials can increase the fixation of organic carbon in the soil.