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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Concentrated flow erosion as a main source of sediments in Galicia, Spain
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Concentrated flow erosion as a main source of sediments in Galicia, Spain

机译：集中流蚀是西班牙加利西亚的主要沉积物来源

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摘要

Knowledge of soil loss rates by water erosion under given climate, soil, topography, and management conditions is important for establishing soil conservation schemes. In Galicia, a region with Atlantic climatic conditions in Spain, field observations over the last decade indicate that interrill, rill and ephemeral gully erosion may be an important sediment source. The aim of this work was to assess concentrated erosion rates, describe types of rills and ephemeral gullies and determine their origin, evolution and importance as sediment sources. Soil surface state and concentrated flow erosion were surveyed on medium textured soils, developed over basic schists of the Ordenes Complex series (Coruna province, Spain) from 1997 to 2006. Soil surface state was characterized by crust development, tillage features and roughness degree. Soil erosion rate was directly measured in the field. Concentrated flow erosion took place mainly on seedbeds and recently tilled surfaces in late spring and by autumn or early winter. During the study period, erosion rates were highly variable and the following Situations Could be distinguished: (a) no incision or limited rill incision, i.e. below 2 Mg ha(-1) year(-1); (b) generalized rill and ephemeral gully incision in the class of mean values between 2.5 and 6.25 Mg ha(-1) year(-1), this was the most common erosion pattern; and (c) heavy erosion as observed during an extremely wet winter period, between October 2000 and February 2001, with erosion figures that may be about ten orders of magnitude higher, up to 55-60 Mg ha(-1) year(-1). Therefore, low values of soil losses are dominant, but also large values of rill and ephemeral gully erosion occurred during the study period.
机译：在给定的气候，土壤，地形和管理条件下，了解水蚀造成的土壤流失率对于建立土壤保护计划非常重要。在西班牙拥有大西洋气候条件的加利西亚地区，近十年来的实地观察表明，间钻，小溪和短暂的沟壑侵蚀可能是重要的沉积物来源。这项工作的目的是评估集中的侵蚀速率，描述小溪和临时沟壑的类型，并确定其起源，演变和作为沉积物来源的重要性。对1997年至2006年Ordenes Complex系列（西班牙科鲁尼亚省）基本片岩上发育的中等质地土壤进行了土壤表面状态和集中流失侵蚀的调查。土壤表面状态的特征是地壳发育，耕作特征和粗糙度。在田间直接测量土壤侵蚀率。集中的水流侵蚀主要发生在春季晚些时候和秋天或初冬的苗床和最近耕作的表面上。在研究期间，侵蚀率变化很大，可以区分以下情况：（a）没有切口或有限的小切口，即低于2 Mg ha（-1）year（-1）; （b）平均值为2.5至6.25 Mg ha（-1）年（-1）的平均值的小类和临时沟壑切口，这是最常见的侵蚀方式; （c）在2000年10月至2001年2月的极端潮湿的冬季观察到的严重侵蚀，侵蚀数字可能高出十个数量级，最高可达55-60 Mg ha（-1）年（-1）。 ）。因此，在研究期间，土壤损失的低值占主导地位，而小溪和临时沟壑侵蚀的值也很大。

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