预测低剂量和一次性添加生物炭与粪肥和氮肥混合后土壤有机碳的变化

IF 2.1 Q3 SOIL SCIENCE
M. Oelbermann, R. Jiang, M. Mechler
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引用次数: 0

摘要

建模在预测生物炭对土壤有机碳动态的长期影响方面起着重要作用。本研究旨在应用Century模型评估有机肥+氮肥(MN)、有机肥+生物炭(MB)和有机肥+氮肥+生物炭(MNB)土壤有机碳的时间变化。结果表明,无论何种改良方式,115年后土壤有机碳储量都无法达到稳定状态(平衡)或耕作前水平。结果表明,两年一次施用有机肥和氮肥(MN)导致土壤有机碳增加84%,而添加生物炭的土壤有机碳增加79%和70%。然而,从作物残茬和改良剂中输入的有机质量足以使活性组分增加86%,周转时间为数月至数年。事实上,在所有修正类型中,周转时间为20 ~ 50年的慢组分碳是土壤有机碳积累的关键驱动力。虽然被动组分是土壤中最稳定的碳形式,其周转时间为400至100年,但一旦向土壤中添加粪肥和生物炭,这一组分增加了32%。我们的研究结果为Century准确预测土壤有机碳储量变化的能力提供了进一步的见解,当粪肥、氮肥或生物炭混合添加到土壤中时。世纪预测土壤有机碳储量在测量值的-1%到+9%之间。然而,由于生物炭经历化学转化(例如,老化)并改变土壤物理参数(例如,体积密度),因此需要对模型进行进一步的微调,而这些目前无法在Century模型中得到解释。解决Century的这些局限性也将有助于增加实测值和预测值之间的关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Predicting changes in soil organic carbon after a low dosage and one-time addition of biochar blended with manure and nitrogen fertilizer
Modeling plays an important role in predicting the long-term effects of biochar on soil organic carbon dynamics. The objective of our study was to apply the Century model to assess changes in temporal soil organic carbon in soil amended with manure and nitrogen fertilizer (MN), with manure and biochar (MB) or with manure, nitrogen fertilizer and biochar (MNB). We determined that, after 115 years, soil organic carbon stocks could not reach a steady state (equilibrium) or pre-cultivation levels, regardless of amendment type. Our results showed that a biennial input of manure and nitrogen fertilizer (MN) led to a 84% increase in soil organic carbon compared to a 79% (MNB) and 70% (MB) increase when amendments contained biochar. However, the quantity of organic matter input from crop residues and amendments was sufficient to increase the active fraction, with a turnover time of months to years, by 86%. In fact, carbon associated with the slow fraction, with a turnover time of 20 to 50 years, was the key driver for soil organic carbon accumulation in all amendment types. Although the passive fraction is the most stable form of carbon in the soil, with a turnover time of 400 to 100 years, once manure and biochar were added to the soil, this fraction increased up to 32%. Our results provided further insight into the ability of Century to accurately predict changes in soil organic carbon stocks when a combination of manure, nitrogen fertilizer or biochar were added to soil. Century predicted soil organic carbon stocks within -1% to +9% of measured values. However, further fine-tuning of the model is required since biochar undergoes chemical transformations (e.g., ageing) and changes soil physical parameters (e.g., bulk density) that can not be currently accounted for in the Century model. Addressing these limitations of Century will also help to increase the relationship between measured and predicted values.
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CiteScore
1.90
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