Aglime (agricultural lime), commonly applied to acid soils to increase the soil pH and productivity, may lead to the release of CO2 into the atmosphere or to carbon (C) sequestration, although the processes involved are not fully understood. As large acreages of arable land are limed annually, exploring soil management practices that reduce aglime-induced CO2 emissions from acid soils while maintaining or improving the soil quality is paramount to mitigating the effects of global climate change. This study, therefore, assessed the effects of organic residues and ammonium on CO2 emissions and soil quality indicators in two limed soils. Two contrasting acid soils (Nariva series, Mollic Fluvaquents and Piarco series, Typic Kanhaplaquults) were amended with varying combinations of aglime (0% and 0.2% w/w CaCO3), organic residue (0% and 5% w/w biochar or poultry litter), and NH4-N (0% and 0.02% w/w) and were incubated in 300 mL glass jars for 31 days. The sampling for CO2 was performed on 11 occasions over the course of the incubation, while soil sampling was conducted at the end. The results indicate that aglime application significantly (p & 0.05) increased the cumulative CO2 emissions in all cases except with the addition of poultry litter. Alternatively, ammonium did not regulate the effect of aglime on CO2 emissions, which was likely because of the low rate at which it was applied in comparison to aglime. The results also showed that poultry litter significantly (p & 0.05) increased the soil electrical conductivity (EC), available nitrogen (N), and pH, especially in the Piarco soil, while the hardwood biochar had little to no effect on the soil properties. Our findings indicate the potential for utilizing poultry litter to reduce the impact of aglime on CO2 emissions while improving the soil quality. Further studies utilizing 13C to trace aglime CO2 emissions are, however, required to identify the mechanism(s) that contributed to this reduction in the emissions.
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机译：搅拌（农业石灰），通常适用于酸性土壤以增加土壤pH和生产率，可能导致CO2的释放到大气中或碳（C）封存，尽管所涉及的过程不完全理解。由于耕地的大面积每年都是跛行的，探索土壤管理实践，减少抗酸性土壤的抗性二氧化碳排放，同时保持或改善土壤质量至关重要，以减轻全球气候变化的影响。因此，本研究评估了有机残留物和铵对两种跛行土壤中的二氧化碳排放和土壤质量指标的影响。修改了两个对比酸性土壤（Nariva系列，Mollic Flyva和Piarco Series，典型Kanhaplaquolts），随着羟基（0％和0.2％w / w caco3），有机残留物（0％和5％w / w biochar或家禽垃圾），NH4-N（0％和0.02％w / w），并在300ml玻璃罐中孵育31天。在孵育过程中11场比赛进行二氧化碳的取样，而在末端进行土壤采样。结果表明，除了添加家禽垃圾之外，末端申请显着施用（P <0.05）增加了所有案例中的累积二氧化碳排放量。或者，铵未调节搅拌器对二氧化碳排放的影响，这可能是由于与搅拌器相比施用的低速率。结果还表明家禽凋落物显着（P <0.05）增加了土壤导电性（EC），可用的氮气（N）和pH，特别是在Piarco土壤中，而硬木Biochar几乎没有对土壤的影响没有影响特性。我们的研究结果表明，利用家禽垃圾的可能性，以减少搅拌器对二氧化碳排放的影响，同时提高土壤质量。然而，利用13C进行追踪搅拌器二氧化碳排放的进一步研究是要求识别有助于这种排放减少的机制。
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