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在非灭菌与灭菌条件下对土壤CO2短期排放特性的研究

Keywords: CO2浓度,非灭菌,灭菌土壤,微生物矿化,膜管技术

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Abstract:

通过室内模拟降雨一维垂直土柱入渗实验,在非灭菌与灭菌条件下,连续地监测土壤不同深度处CO2浓度以及土壤含水率。采用闭合循环回路测量系统,结合膜管(METT)技术来对降雨条件下土壤不同深度处CO2浓度进行监测,研究CO2的短时排放特性。结果表明,在时间上土壤不同深度处含水率与CO2浓度变化并未呈现出一致的趋势。对干土加水时,土壤CO2浓度的迅速增加除了受到微生物矿化作用之外,气体对流、扩散等物理过程也影响较大。对于灭菌土壤,CO2在土壤中的运移只是一个较短的动力学过程,故其变化较快;而对于非灭菌土壤,由于微生物对土壤中有机质的矿化作用,所以CO2浓度较高但变化相对较缓。

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