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热带土壤中的生物炭分散及其对土壤有机碳的影响

Alfred Obia¹, Jing Lyu², Jan Mulder³

¹Department of Agronomy, Faculty of Agriculture and Environment, Gulu University, Gulu, Uganda.

|April 18, 2024

概括

对土壤施加的生物炭会显著分散,很大程度上会横向丢失,而有些则会更深地移动. 这种生物炭碳 (BC) 运动,以及减少土壤原生有机碳 (SOC) 的积极原料效应,影响土壤健康.

科学领域:

土壤科学土壤科学
环境科学环境科学
农业学是一种农业学.

背景情况:

生物炭的应用可以改善土壤质量和作物产量.
生物炭颗粒在土壤中的分散和命运仍未得到充分研究.
了解生物炭对土壤有机碳 (SOC) 的影响至关重要.

研究的目的:

量化不同生物炭颗粒大小的垂直和横向迁移.
评估生物炭应用对原生土壤有机碳 (SOC) 库存的影响.
评估生物炭剂量和颗粒大小对其分散和SOC动态的影响.

主要方法:

稳定同位素分析以追踪生物碳 (BC) 运动.
在赞比亚的Acrisol中,在低剂量和高剂量中应用细,中间和粗生物炭.
在4.5年内监测土壤层 (0-7厘米和7-30厘米) 和周边地区的生物炭分布.

主要成果:

38-75%的应用生物炭碳 (BC) 从地表层中消失,在更深层的土壤层中检测到4-25%.
估计表明,25-60%的BC被横向运输出实验场地.
在经过生物炭处理的土地上,本地SOC库存平均减少了18.4% (正原始化).
精细和中间生物炭在较低剂量时显示出更大的向下迁移,而粗生物炭在较高剂量时占主导地位.

结论:

生物炭分散是显著的,涉及大量的横向损失和垂直迁移.
生物炭的应用可以诱导积极的原始化,减少原生SOC,尽管负面的原始化可能会在以后发生.
生物炭的土壤有机碳 (SOC) 动态和环境影响取决于其分散,大小和剂量.

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