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在温带农业土壤中,矿物相关有机碳没有可检测的上限

Neha Begill¹, Axel Don¹, Christopher Poeplau¹

¹Thünen Institute of Climate-Smart Agriculture, Braunschweig, Germany.

Global change biology

|June 4, 2023

概括

土壤有机碳捕获对于减缓气候变化至关重要. 矿物相关有机碳 (MAOC) 在土壤中的积累不受细颗粒含量限制,这挑战了以前的假设.

科学领域:

土壤科学土壤科学
环境科学环境科学
生物地质化学生物地质化学

背景情况:

土壤有机碳 (SOC) 封存是缓解气候变化的关键战略.
矿物相关有机碳 (MAOC) 是SOC的稳定,寿命长的组成部分.
目前的理解表明,MAOC积累受到土壤细颗粒含量 (粘土和泥) 的限制.

研究的目的:

调查土壤中MAOC积累的上限.
为了测试MAOC含量受到土壤质地限制的假设.
重新评估散装SOC,MAOC和土壤细分数含量之间的关系.

主要方法:

来自德国农业土壤库存的189个土壤样本的分析.
在广泛的SOC和粘土度范围内测量散装SOC和MAOC含量.
对SOC,MAOC和土壤纹理之间的关系进行统计分析.

主要成果:

在农田和草原土壤中,MAOC的比例在不同的散装SOC水平上保持稳定.
没有观察到MAOC积累的上限,无论土壤质地如何.
微细分数C含量与微细分数含量呈负相关性,这与基于土壤质感的限制相矛盾.

结论:

马奥克的积累本质上并不受细土壤颗粒的数量限制.
土壤质地影响SOC-MAOC动态,但不会对MAOC施加严格的上限.
这些发现需要对预测土壤中MAOC储存潜力的模型进行修订.

关键词:

碳和度的碳和度是什么碳封存是一种碳封存方式.国家土壤监测监测有机物质的分化有机物质的分化.

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