This study was conducted to improve our understanding of the effect of biochar on the degradation of original soil organic carbon (SOC) and the resulting net C sequestration. A 120‐day incubation experiment was conducted to detect the CO₂ evolution from soil amended with three kinds of biochar, namely, rice husk biochar (RH), pecan shell biochar (PS), and bamboo biochar (BB), at biochar to soil ratios of 0% (as control), 1%, 2%, and 5%, as well as 100% pure biochar, and to evaluate their priming effect on SOC mineralization. Results showed that the cumulative mineralized amounts of SOC decreased by 7.95–10.7% with 5% RH, PS, and BB treatments, whereas there were no significant differences in 1% or 2% biochar treatments after 120 days of incubation compared with the control. Biochar had a suppressing influence on native SOC decomposition, and the effect increased with the amount of applied biochar increasing. The negative priming effect of biochar on the mineralization of SOC was mainly observed after 15 days of incubation and increased with incubation time. The negative effects of BB and RH were significantly stronger than that of PS at the 5% application ratio. This was mainly due to the less pores and smaller specific surface area of PS, which resulted in the weaker encapsulation and adsorption protection effect of PS than RH and BB, and inhibited the degradation of the adsorbed native SOC. Therefore, BB and RH have great potential for C sequestration and mitigation, especially in soils with low organic C.

中文翻译：

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三种生物炭对原生土壤有机碳矿化的负向激发作用

进行这项研究的目的是增进我们对生物炭对原始土壤有机碳（SOC）降解以及由此产生的净C固存的影响的理解。进行了120天的孵育实验以检测CO ₂在生物炭与土壤的比率为0％（作为对照），1％，2的土壤中，从用稻壳生物炭（RH），山核桃壳生物炭（PS）和竹生物炭（BB）三种生物炭修正的土壤中进化％和5％以及100％纯生物炭，并评估它们对SOC矿化的引发作用。结果表明，在RH，PS和BB处理为5％的条件下，SOC的累积矿化量降低了7.95–10.7％，而在120天的温育后，与对照相比，1％或2％的生物炭处理无显着差异。生物炭对天然SOC的分解具有抑制作用，并且随着生物炭施用量的增加，其效果增加。生物炭对SOC矿化的负引发作用主要在培养15天后观察到，并随培养时间的增加而增加。在5％的施用比例下，BB和RH的负面效应明显大于PS。这主要是由于PS的孔较少和比表面积较小，导致PS的包封和吸附保护作用比RH和BB弱，并抑制了吸附的天然SOC的降解。因此，BB和RH在固碳和减缓碳方面具有巨大潜力，尤其是在有机碳含量较低的土壤中。