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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The impact of agriculture on solute and suspended sediment load on a Mediterranean watershed after intense rainstorms
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The impact of agriculture on solute and suspended sediment load on a Mediterranean watershed after intense rainstorms

机译：暴雨后农业对地中海流域溶质和悬浮泥沙负荷的影响

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摘要

The solute and suspended-sediment load following fi ve rainstorms (2005–2007) with varied intensities were studied at the Vernegà experimental watershed, north-western Spain. Two land-use areas are located within this watershed, the upstream one (forest) with 160 ha a 100% forested area, and the downstream one (agricultural) with 97 ha being 9 ha conventional agricultural fi eld and 88 ha forest. This study investigates the capacity of each land-use to yield water, suspended sediment concentration (SSC) and dissolved solid concentration (DSC). The hypothesis is that DSC and SSC from the agricultural area are greater than DSC and SSC of the forest area. Results showed that the agriculture area produced signifi cantly greater mean DSC than in the forest area, the main contribution was the Ca2+ (24 68 ± 46 52 mg l-1) ion at the agricultural area. A long-term sediment production rate at the agricultural outlet was calculated (691 tonnes per 100 years) based on the total sediment discharge (TSD)and the recurrence interval of the largest event of the fi ve rainstorms (October 2005). Geographic information system (GIS) spatial data layers of the watershed were produced to determine the relation of tracks, landforms, slopes and forest management to SSC yield in the forest outlet (133·89 ± 308·14 mg l-1) during the fi ve rainstorms. Agriculture practices are the main cause of soil erosion at the study area.
机译：在西班牙西北部的韦尔纳加（Vernegà）试验流域研究了五次暴雨（2005-2007年）后强度和悬浮物的溶质和悬浮沉积物负荷。该流域内有两个土地利用区，上游的一个（森林）面积为160公顷，占森林面积100％，下游的一个（农业）土地面积为97公顷，为常规农业面积9公顷，森林为88公顷。这项研究调查了每种土地利用产生水的能力，悬浮沉积物浓度（SSC）和溶解固体浓度（DSC）。假设是农业地区的DSC和SSC大于森林地区的DSC和SSC。结果表明，农业区产生的平均DSC明显高于林区，其主要贡献是农业区的Ca2 +（24 68±46 52 mg l-1）离子。根据总沉积物排放量（TSD）和最大暴雨事件的重复间隔（2005年10月），计算出了农业出口的长期沉积物生产率（每100年691吨）。建立了流域的地理信息系统（GIS）空间数据层，以确定流域期间森林出口（133·89±308·14 mg l-1）的径迹，地形，坡度和森林管理与SSC产量的关系。 ve暴雨。农业实践是研究区域水土流失的主要原因。

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