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粗根增强增加了土壤有机碳,同时降低了湿地中的稳定性

Zhenghao Liang^1,2, Jia Song^1,3, Ruifeng Sun^1,3

¹CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research (YIC), Chinese Academy of Sciences (CAS), Shandong Key Laboratory of Coastal Environmental Processes, YICCAS, Yantai, Shandong 264003, P. R. China.

Environmental science & technology

|January 6, 2026

概括

增加的降水增加了湿地的粗根,增强了土壤有机碳 (SOC),但降低了其稳定性. 这影响了碳储存和气候反.

科学领域:

环境科学环境科学
土壤科学土壤科学
生态生态学生态生态学

背景情况:

湿地土壤有机碳 (SOC) 捕获对于减少大气中的CO2至关重要.
了解SOC分数,有机颗粒碳 (POC) 和矿物相关有机碳 (MAOC) 的稳定性是关键.
粗根和细根在变化的降水条件下调节SOC稳定性的不同作用尚未完全理解.

研究的目的:

调查模拟降水变化对湿地SOC分量的影响.
为了确定粗根和细根对SOC封存和稳定性的具体贡献.
阐明连接根动力学,SOC和碳气候反的机制.

主要方法:

一个为期10年的实地实验,模拟降水变化 (-60%至+60%).
在土壤和地下土壤中分析SOC分量 (POC和MAOC).
测量根生物质,微生物活动和营养物质的运输.

主要成果:

降水量增加增加了Gramineae的丰富性和粗根生物质.
粗根通过微生物刺激直接增加了土壤表层的POC和MAOC.
增加的粗根促进了垂直运输,促进了地下POC和MAOC,但降低了MAOC/POC比率,表明SOC稳定性降低.

结论:

在变化的降水条件下,粗根在湿地碳封存中发挥着重要作用.
虽然粗根增加了整体的SOC,但它们更喜欢不稳定的POC而不是稳定的MAOC,可能会增加碳释放.
这些发现提供了对湿地碳气候反在降雨模式变化下的机制性见解.

关键词:

马奥克 (MAOC) 是一个主要的药物.在 POC POC POC 中.粗的根,粗的根.泄漏成分的组成部分微生物生物质的生物质.降水降水降水降水降水

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