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在恢复的山沼湿地中,土壤有机碳稳定性的变化

Xin Yang¹, Jiao Zheng¹, Dan Yang²

¹College of Life Sciences, Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region, Guizhou University, Guiyang, 550025, China.

Scientific reports

|October 10, 2024

概括

通过用本地植物取代农田,恢复湿地显著增加了山区沼泽地的土壤有机碳 (SOC) 和结合铁的有机碳 (Fe-OC). 这种转化增强了土壤的碳捕获和随时间的稳定性.

科学领域:

生态生态学生态生态学
土壤科学土壤科学
环境科学环境科学

背景情况:

在全球范围内,湿地生态系统的恢复包括用本土的湿地植物取代农田.
了解土壤有机碳 (SOC) 动态对于恢复的山区沼泽地的有效土壤碳管理至关重要.

研究的目的:

调查恢复田到Sphagnum palustre L.湿地对土壤特性和SOC的长期影响.
在沼泽恢复期间分析SOC丰度,组成和稳定机制的变化.

主要方法:

从恢复的沼泽 (0,2,10,20年) 和天然的Sphagnum湿地采集的地表土样 (020厘米) 的分析.
测量土壤水分含量 (SMC),pH,质地,氧化铁,SOC,矿物相关有机碳 (MAOC) 和结合铁的有机碳 (Fe-OC).

主要成果:

沼泽恢复增加了SMC,氧化铁,SOC,MAOC,Fe-OC和Fe-OC/SOC比率,同时降低了MAOC/SOC比率.
与恢复的息地相比,天然的Sphagnum湿地呈现出更高的SMC,SOC和MAOC.
SOC和Fe-OC/SOC与SMC和铁含量正相关,与土壤pH负相关.

结论:

将大米田转化为沼泽湿地对于增加不稳定的SOC和Fe-OC捕获具有重要意义.
SOC的有机矿物稳定机制需要在不同的SOC分数和恢复阶段进行进一步的研究.

关键词:

与矿物相关的有机碳山区沼泽地山区沼泽地土壤水分含量土壤水分含量土壤有机碳土壤有机碳

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The Carbon Cycle

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