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首页> 外文期刊>Geodinamica Acta >Particle size distributions of South Tunisian soils erodible by wind
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Particle size distributions of South Tunisian soils erodible by wind

机译：突尼斯南部风蚀土壤的粒径分布

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180 samples representative of surface soils erodible by wind were collected in South Tunisia to retrieve their grain size distribution. Dry sieving using 13 sieves was favour to preserve as much as possible the soil aggregates in their natural state. Two different methods were used to characterize the grain size distribution; the φ method of moments and the use of a combination of log-normal statistical functions. Both methods underline the ubiquitous and dominant presence of a very fine sand population (around 100μm in diameter), very well sorted (o=1,23 ) which corresponds to the grain size range for which the wind energy required for initiating the aeolian erosion is minimum. This clearly suggests that most of the soils in South Tunisia have the potential to be easily eroded by wind. However, in about 1/3 of the samples mainly those located in Dahars and in the vicinity of mountains, a secondary population of coarse grains (1500 pm in diameter) is also observed. This coarse mode could significantly reduce the wind erosion of the soils where it is present by covering a part of the surface and by limiting the efficiency of the wind transfer to the surface.
机译：在突尼斯南部收集了180个代表风蚀的表层土壤样品，以恢复其粒度分布。使用13个筛子进行干筛有利于将土壤聚集体保持在其自然状态。两种不同的方法用于表征晶粒尺寸分布。 φ矩法和对数正态统计函数的组合。两种方法都强调了非常精细的砂种群（直径约100μm）普遍存在且占主导地位，其分类非常好（o = 1,23），这对应于引发风蚀的风能所对应的晶粒尺寸范围。最低。这清楚地表明，突尼斯南部的大多数土壤都有可能被风轻易侵蚀。但是，在大约1/3的样本中，主要是位于达哈尔和山区附近的样本中，还观察到大量的粗粮（直径1500 pm）。这种粗模式可以通过覆盖一部分表面并限制风向地面的传输效率来显着减少土壤的风蚀。

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