压实作用下热带泥炭表层向深层土壤层的转移控制了无地下水情况下的碳排放

IF 2.1 Q3 SOIL SCIENCE
M. K. Samuel, Stephanie L. Evers
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引用次数: 0

摘要

压实被认为是通过提高土壤湿度来降低火灾风险的有效方法。这种技术通过压实限制泥炭孔隙,促进毛细管作用的改善,从而达到保水和补水的目的。热带泥炭地的压实虽然有利于防火,但有可能影响生物地球化学过程和随后的碳排放。在这种环境中,压实程度和地下水位密切相关,因此很难区分物理化学特性的控制。因此,本研究试图了解泥炭压实如何影响其特性、碳排放及其关系,重点关注地球物理过程。本研究从马来西亚半岛雪兰莪州的次生泥炭沼泽林和油棕种植园采集了完整的泥炭样本。压实处理可实现三种程度的体积减小。使用自动气体分析仪测量了二氧化碳和甲烷的排放量,并测定了泥炭的理化性质。结果显示,机械压实显著改变了次生林泥炭的理化性质,与油棕种植园的模式相反,尤其是在总氮和硫方面。此外,二氧化碳排放量(从 275.4 毫克/米-2 小时-1 降至 182.0 毫克/米-2 小时-1;33.9%)与甲烷吸收量(从-17.8 微克/米-2 小时-1 降至-5.2 微克/米-2 小时-1;70.1%)的平均减少百分比比(约为 1:2)表明,由于压实作用,腐烂程度较低的泥炭主要在次生泥炭沼泽森林样本中进入了不同的腐烂阶段并转移到了更深的土层。油棕种植园样本的理化性质和碳排放均未受到压实的影响,这表明这种方法无法有效降低已排水系统的火灾风险。这项研究强调了在没有地下水的情况下了解压实效果的必要性,以便准确评估这种技术的广泛应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Translocation of tropical peat surface to deeper soil horizons under compaction controls carbon emissions in the absence of groundwater
Compaction is recognized as an effective method for mitigating the risk of fires by enhancing soil moisture levels. This technique involves restricting peat pore spaces through compaction, facilitating improved capillary action for water retention and rehydration. The compaction of tropical peatlands, while beneficial for fire prevention, has the potential to influence biogeochemical processes and subsequent carbon emissions. The magnitude of compaction and groundwater level are strongly coupled in such environments, making it difficult to distinguish the control of physicochemical properties. Therefore, this study seeks to understand how peat compaction affects its properties, carbon emissions, and their relationship, with a focus on geophysical processes. Intact peat samples were collected from a secondary peat swamp forest and an oil palm plantation in Selangor, Peninsular Malaysia. Compaction treatments were applied to achieve three levels of volume reduction. CO2 and CH4 emissions were measured using an automated gas analyzer, and the physicochemical properties of the peat were determined. The results revealed that mechanical compaction significantly altered the physicochemical properties of the secondary forest peat, displaying an opposite pattern to the oil palm plantation, particularly regarding total nitrogen and sulfur. Moreover, the average reduction percentage ratio of CO2 emissions (from 275.4 to 182.0 mg m-2 hr-1; 33.9%) to CH4 uptakes (from -17.8 to -5.2 µg m-2 hr-1; 70.1%) (~1:2) indicated distinct stages of decomposition and translocation of less decomposed peat to deeper layers due to compaction, predominantly in secondary peat swamp forest samples. The oil palm plantation samples were unaffected by compaction in terms of physicochemical properties and carbon emissions, indicating the ineffectiveness of this approach for reducing fire risk in already drained systems. This study underscores the necessity of understanding the effects of compaction in the absence of groundwater to accurately evaluate the widespread application of this technique.
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CiteScore
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