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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Fire-induced soil water repellency under different vegetation types along the Atlantic dune coast-line in SW Spain.
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Fire-induced soil water repellency under different vegetation types along the Atlantic dune coast-line in SW Spain.

机译：西班牙西南大西洋沙丘海岸线沿不同植被类型的火诱导土壤憎水性。

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摘要

The distribution and variation with soil depth of water repellency has been studied in fire-affected sand dunes under three different vegetation types (pine forest, shrubland and sparse herbaceous vegetation) in SW Spain. The persistence and intensity of water repellency at the exposed surface of soil was measured using the water drop penetration time test and the contact angle method, respectively, in surface samples (0-3 cm) collected at burned and unburned areas. The variation of water repellency with depth in burned areas was studied in soil profiles every 5 cm between 0 and 40 cm depth. None or slight soil water repellency was observed at unburned soil sites, whereas burned soil sites showed a high degree of repellency, especially under pines and shrubland. The spatial pattern of fire-induced soil water repellency was found to be associated to vegetation types, although it was modulated by soil acidity and the soil organic carbon content. Soil water repellency was generally higher at the soil surface, and decreased with depth. Dense pine forests and shrublands showed strong and/or severe water repellency in depth, but it was rare and limited to the first five centimeters under sparse herbaceous vegetation. The heterogeneity of moisture patterns under dense pine forests or shrublands showed the existence of wetting and water repellent three-dimensional soil patches.
机译：在西班牙西南部三种不同植被类型（松林，灌丛和稀疏草本植被）下，研究了受火影响的沙丘上拒水性随土壤深度的分布和变化。使用水滴渗透时间测试和接触角方法分别在燃烧和未燃烧区域收集的表面样本（0-3厘米）中测量土壤裸露表面的拒水性和强度。在0至40厘米深度之间的每5厘米土壤剖面中研究了烧伤区域的疏水性随深度的变化。在未燃烧的土壤位点没有观察到或略有土壤疏水性，而燃烧的土壤位点显示出很高的排斥性，尤其是在松树和灌木丛下。发现火引起的土壤疏水性的空间格局与植被类型有关，尽管它受到土壤酸度和土壤有机碳含量的调节。土壤疏水性通常在土壤表层较高，并随深度降低。茂密的松树林和灌木丛在深度上具有很强和/或很强的拒水性，但很少见，并且仅限于稀疏的草木植被下的前五厘米。茂密的松树林或灌木林下水分模式的异质性表明存在湿润和憎水的三维土壤斑块。

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