野火频率对火后土壤地表水动态的影响

IF 2.6 2区 农林科学 Q1 FORESTRY
O. González-Pelayo, S. A. Prats, E. van den Elsen, M. C. Malvar, C. Ritsema, S. Bautista, J. J. Keizer
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引用次数: 0

摘要

地中海盆地野火频率的增加可能会影响未来的植物-土壤-水动力学。土壤的保水能力是影响植物火后再生的一个关键参数。然而,很少有研究关注野火频率的增加会如何影响与保水相关的不同土壤特性。本研究旨在了解野火频率、土壤水相关特性和土壤中地表水动态之间的关系。为此,在葡萄牙 2012 年夏季野火之后,选择了三组野火频率不同(自 1975 年以来,0 次野火与 1 次野火与 4 次野火)的海洋松林。在九个研究地点中,每个地点都选择了三株再发芽灌木和邻近的裸土(54 个微点)。在那里,土壤覆盖率、土壤水分保持曲线和表层(0-5 厘米)土壤水分相关特性(质地、容重、有机质含量、土壤水分、土壤表层憎水性)被监测了一年。此外,还利用安装在 2.5 厘米和 7.5 厘米深处的 72 个探头对火灾后土壤水分动态记录进行了连续分析。受 1 次火灾影响的山坡比受 4 次火灾影响的山坡的植物恢复能力更强。在干旱季节,4 次火灾的山坡提前 17 天达到水分胁迫阈值,裸露微地也提前 10 天达到阈值。植物水分胁迫期更长,裸露土壤斑块面积更大。野火频率的增加促进了土壤有机质含量的提高,但可用含水量却降低了,这强调了土壤有机质质量特征对水分相关特性的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The effects of wildfire frequency on post-fire soil surface water dynamics

The effects of wildfire frequency on post-fire soil surface water dynamics

Increasing wildfire frequency in the Mediterranean Basin could affect future plant-soil–water-dynamics. The capacity of soils to retain water is a key parameter affecting plant post-fire regeneration. Yet, few research has looked at how different soil properties related to water retention is affected by increasing wildfire frequency. This study aimed at understanding the relationship between wildfire frequency, soil–water-related properties and the dynamics of surface water in soils. To this, after a 2012-summer wildfire in Portugal, three sets of three replicate maritime pine stands with contrasted wildfire frequency were selected (0 vs. 1 vs. 4 fires since 1975). At each of the nine study sites, three re-sprouter shrubs and neighbouring bare soil were chosen (54 microsites). There, soil cover, soil–water retention curves and surface (0–5 cm) soil–water-related properties (texture, bulk density, organic matter content, soil moisture, soil surface water repellency) were monitored for one year. Furthermore, records of post-fire soil moisture dynamics were analysed continuously using 72 probes installed at 2.5 and 7.5 cm depth. The hillslopes affected by 1 fire showed higher plant recovery than the 4 fires hillslopes. During the dry season, the threshold for water stress was reached 17 days sooner in the 4 fires hillslopes, and also 10 days sooner on bare microsites. Periods of plant water stress were longer and bare soil patches size bigger. The increase in wildfire frequency promoted high soil organic matter contents but less available water content, stressing the importance of soil organic matter quality characterization in water-related properties.

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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
77
审稿时长
6-16 weeks
期刊介绍: The European Journal of Forest Research focuses on publishing innovative results of empirical or model-oriented studies which contribute to the development of broad principles underlying forest ecosystems, their functions and services. Papers which exclusively report methods, models, techniques or case studies are beyond the scope of the journal, while papers on studies at the molecular or cellular level will be considered where they address the relevance of their results to the understanding of ecosystem structure and function. Papers relating to forest operations and forest engineering will be considered if they are tailored within a forest ecosystem context.
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