易分解碳输入模式对沉积物共代谢效应的影响

通过构建室内微宇宙系统,运用稳定碳同位素示踪法,解析混合处理组中各有机组分代谢释放的CO2含量,探讨相对易分解碳源的输入对湖泊沉积物有机碳矿化过程的影响.结果表明:添加相对易分解碳源的处理组中,CO2排放量明显升高,较对照组分别提高了45.49％(单次添加组)、52.61％(重复添加组)和57.65％(连续添加组),分...

The co-metabolism effect of lake sediments input pattern of labile carbon

The microcosm system was constructed to analyze the CO₂ release during the metabolism processes of organic components in the mixed treatment by using the stable carbon isotope tracer. The influence of the labile carbon addition on the decomposition process of organic carbon in lake sediments was also explored. The results showed that: Compared with the control, the CO₂ emissions in the treatment with labile carbon addition increased by 45.49% for single addition treatment (ST), 52.61% for repeated addition treatment (RT) and 57.65% for continuous addition treatment (CT), respectively. The CO₂ emissions from sediments in each treatment increased by 16.92% (ST), 24.26% (RT) and 27.40% (CT) than the control, respectively. Although the positive co-metabolic effect (promoting the decomposition of organic carbon in sediments) was observed in each treatment under different addition modes, the net organic carbon content increased at the end of culture. Glucose promoted the mineralization of organic carbon in sediments, but had little effect on its own metabolism. Considering that the outbreak frequency and range of algae in eutrophic lakes are further increased, the co-metabolism effect triggered by the continuous input of algae organic detritus cannot be ignored, which weakens the function of carbon sink of lake sediments.