...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Runoff and sediment yield from land under various uses in a Mediterranean mountain area: Long-term results from an experimental station
【24h】

Runoff and sediment yield from land under various uses in a Mediterranean mountain area: Long-term results from an experimental station

机译：地中海山区各种用途下土地的径流和沉积物产量：实验站的长期结果

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study we analyzed runoff and sediment yield from land under various traditional and current land uses in Mediterranean mountain areas, using long-term data from an experimental station in the Aísa Valley, Central Spanish Pyrenees. Monitoring at this station has provided 20years of data that can help explain the hydrological and geomorphological changes that have been observed at larger spatial scales, and also the changes that have occurred to some of the most characteristic landscapes of the Mediterranean middle mountains. In spite of the problems associated with the use of small experimental plots, the results obtained are consistent with other studies in the Mediterranean region, and confirm the strong influence of land use changes on runoff generation and sediment yield. The results indicate that: (i) cereal cultivation on steep slopes (both alternating cereal cultivation and fallow on sloping fields and shifting agriculture on the steepest slopes) represents a major problem for soil conservation. This explains the occurrence throughout the Mediterranean mountains of many degraded hillslopes, which show evidence of sheet wash erosion, rilling, gullying and shallow landsliding; (ii) farmland abandonment has led to a marked reduction in runoff and sediment yield as a consequence of rapid plant recolonization, particularly by dense shrubs; (iii) the natural transformation of abandoned fields into grazing meadows has reduced runoff and sediment yield. Land use trends in the Mediterranean mountains are mainly characterized by generalized farmland abandonment and a decrease in livestock pressure. From a hydrological and geomorphological point of view the main consequences have been a reduction in overland flow from the hillslopes, and a reduction in sediment sources, with differences up to one order of magnitude in sediment yield from dense shrub cover and grazing meadow areas compared with areas under shifting agriculture.
机译：在这项研究中，我们使用来自西班牙比利牛斯中部艾莎谷实验站的长期数据，分析了地中海山区各种传统和当前土地利用下土地的径流和泥沙产量。该站的监测提供了20年的数据，可以帮助解释在较大空间范围内观察到的水文和地貌变化，以及地中海中山某些最具特色的景观所发生的变化。尽管使用小型实验区存在问题，但获得的结果与地中海地区的其他研究一致，并证实了土地利用变化对径流产生和沉积物产量的强烈影响。结果表明：（i）在陡坡上进行谷物种植（在坡地上交替进行谷物种植和休耕，在最陡峭的斜坡上进行农业转移）是水土保持的一个主要问题。这解释了整个地中海山区发生了许多退化的山坡，这表明有片状冲刷侵蚀，钻凿，沟壑和浅层滑坡的迹象; （ii）由于植物快速重新定殖，特别是由于茂密的灌木丛，农田被遗弃导致径流和沉积物产量显着减少; （iii）荒地自然转化为放牧草地减少了径流和沉积物产量。地中海山区的土地利用趋势的主要特点是农田普遍被遗弃和牲畜压力下降。从水文和地貌学的观点来看，主要后果是减少了山坡的陆上径流，减少了泥沙源，与之相比，稠密的灌木覆盖区和放牧草地地区的泥沙产量差异高达一个数量级。农业转移地区。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号