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土壤有机碳形成效率从草/和料输入及其驱动因素:从全球作物土地的长期数据估计的估计

Yulong Yin¹, Zhong Chen¹, Haiqing Gong¹

¹State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China.

Global change biology

|August 13, 2024

概括

从作物残留物和肥中形成新的土壤有机碳 (SOC) 是缓解气候变化的关键. 全球分析显示,NCE因地点而异,最初的SOC和粘土含量是关键监管因素.

科学领域:

农业科学农业科学
土壤科学土壤科学
气候科学气候科学

背景情况:

土壤有机碳 (SOC) 从有机投入物如草/或肥中形成,对于农田的气候变化缓解至关重要.
量化新SOC形成的全球效率,特别是新碳效率 (NCE),以及其空间可变性仍然是一个重要的知识差距.

研究的目的:

为了确定农田NCE的空间变异性,从全球的草/或肥输入.
确定影响NCE的关键因素,并为全球的耕地绘制网格级NCE地图.

主要方法:

分析了来自全球404个地点的897次长期现场测量.
统计分析以确定调节NCE的因素,包括初始SOC,粘土含量和温度.
全球农田NCE的高分辨率绘制.

主要成果:

全球田和高地耕地的NCE平均值分别为13.8%和10.9%.
最初的土壤有机碳 (SOC) 和土壤粘土含量是NCE的主要调节者.
在初始SOC和NCE之间发现了抛物线关系,顶点约为17 g kg-1;土壤粘土含量与NCE呈正相关性.

结论:

该研究提供了第一个全球评估和高分辨率地图的农田NCE从有机投入.
最初的SOC和土壤粘土含量是预测SOC封存效率的关键因素.
结果为评估土壤碳动态提供了一个基准,并指导农田的目标碳管理战略,以缓解气候变化.

关键词:

气候变化缓解气候变化缓解驱动力是驱动力的驱动力.全球农作物土地新的SOC形成的效率效率.随机森林预测随机森林预测草/和便,以及便.

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The Soil Ecosystem

The Soil Ecosystem

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The Carbon Cycle

The Carbon Cycle

Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.