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深化根源输入:从培育更深根的玉米中获得的潜在的土壤碳积累

M Francesca Cotrufo¹, Michelle L Haddix¹, Jack L Mullen¹

¹Department of Soil and Crop Sciences, Colorado State University, Fort Collins, Colorado, USA.

Global change biology

|November 19, 2024

概括

为了更深或更丰富的根源,养殖玉米可以增加土壤有机碳 (SOC),但每公的影响很小. 在全球范围内扩展这项技术可能会为气候带来好处.

科学领域:

农业科学农业科学
土壤科学土壤科学
气候变化缓解缓解气候变化缓解

背景情况:

提高单年作物的根深度和生物量是一种增加土壤有机碳 (SOC) 的策略,以缓解气候变化和改善土壤健康.
玉米是一种面积较大的作物,其根很浅,这为基因改进提供了机会.
目前缺乏从改进的根表型中了解SOC积累潜力.

研究的目的:

量化玉米根和排泄物分解的新SOC的形成和组成.
为了模拟玉米观念型的SOC积累潜力,提高根深度或生物质.
评估基于根的育种策略对玉米SOC隔离的可扩展性和影响.

主要方法:

一个为期2年的实地实验,使用同位素标记的玉米根和排泄物来追踪SOC形成和组成 (POM,chaOM,MAOM) 到90厘米.
利用基于过程的MEMS 2模型,从假设的玉米根意识形态模拟SOC积累.
基于育种的根改善与SOC积累的既定作物管理实践进行了比较.

主要成果:

玉米根分解优先形成有机颗粒物 (POM),低于50厘米的效率更高.
根排泄物优先形成矿物相关有机物 (MAOM).
模拟更深的根或增加的根生物量产生了适度的SOC增加 (0.050.15 Mg C ha-1 yr-1),在管理实践估计的下端.

结论:

提高根投入的育种玉米对SOC积累的每公影响有限.
在玉米-大豆系统中显著的SOC积累和温室气体减少需要更广泛的作物系统变化.
该研究为量化和预测由作物根源输入修改驱动的SOC变化提供了一个框架.

关键词:

一个MEMS模型模型.玉米玉米玉米玉米玉米排泄物是排泄出来的玉米玉米玉米是一种根根根根根根土壤有机碳土壤有机碳

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