野火复发对土壤特性和有机碳分量的影响
L Salgado1, M G Alvarez2, A M Díaz3
1Environmental Biogeochemistry & Raw Materials Group and Institute of Natural Resources and Territorial Planning, Campus of Mieres, University of Oviedo, 33600, Mieres, Spain; SMartForest Group, Department of Organisms and Systems Biology, Polytechnic School of Mieres, University of Oviedo, 33600, Mieres, Spain.
Journal of environmental management
|February 22, 2024
概括
野火的复发显著影响土壤的特性,减少不稳定的土壤有机碳和,特别是酸盐. 这些影响随着火灾频率的增加而加剧,突显了对地中海生态系统的长期后果.
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:
- 由于气候变化和人类活动,野火的复发和严重程度在全球范围内不断增加.
- 地中海地区特别容易受到野火的影响,导致大量的生态系统和土壤退化.
- 经常发生的野火对受影响地区的土壤健康和碳储存构成重大威胁.
研究的目的:
- 调查野火复发对土壤有机碳和分化的影响.
- 在不同的火频率下,评估土壤参数如pH值和阴离子交换能力 (CEC) 的变化.
- 了解反复发生的野火对西班牙阿兰德土壤属性的长期影响.
主要方法:
- 在西班牙阿兰德的6个采样场地根据野火复发率 (在2005-2022年间发生0-4起事件) 进行了选择.
- 分析了土壤样本的有机碳分数 (不稳定和稳定),物种,pH值和阴离子交换能力 (CEC).
- 进行了统计分析,以确定火灾复发和测量土壤参数之间的关系.
主要成果:
- 野火的复发显著影响了土壤质地,无机元素组成和CEC,但不是pH或电导率 (CE).
- 在经常燃烧的土壤中,可变碳分量 (冷水和热水可提取) 和酸分别减少了36%,5%和45%.
- 湿酸度保持稳定或增加,而土壤物种,特别是酸盐,随着火灾复发的增加而显著下降.
结论:
- 野火显然改变了土壤的有机碳和分数,其影响随着反复增加而加剧.
- 经常发生的野火导致土壤不稳定有机物和的损失,影响土壤肥力和生态系统功能.
- 这些发现强调了地中海土壤对重复发生的火灾事件的脆弱性以及需要有效的火灾管理策略.
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