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首页> 外文期刊>Environmental Management >Dynamics of Soil Erosion as Influenced by Watershed Management Practices: A Case Study of the Agula Watershed in the Semi-Arid Highlands of Northern Ethiopia
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Dynamics of Soil Erosion as Influenced by Watershed Management Practices: A Case Study of the Agula Watershed in the Semi-Arid Highlands of Northern Ethiopia

机译：流域管理实践对土壤侵蚀动态的影响-以埃塞俄比亚北部半干旱高地集聚流域为例

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摘要

Since the past two decades, watershed management practices such as construction of stone bunds and establishment of exclosures have been widely implemented in the semi-arid highlands of northern Ethiopia to curb land degradation by soil erosion. This study assessed changes in soil erosion for the years 1990, 2000 and 2012 as a result of such watershed management practices in Agula watershed using the Revised Universal Soil Loss Equation. The Revised Universal Soil Loss Equation factors were computed in a geographic information system for 30 × 30 m raster layers using spatial data obtained from different sources. The results revealed significant reduction in soil loss rates by about 55 % from about 28 to 12 t ha~(-1) per year in 1990-2000 and an overall 64 % reduction from 28 to 10 t ha~(-1) per year in 1990-2012. This change in soil loss is attributed to improvement in surface cover and stone bund practices, which resulted in the decrease in mean C and P-factors, respectively, by about 19 % and 34 % in 1990-2000 and an overall decrease in C-factor by 29 % in 1990-2012. Considerable reductions in soil loss were observed from bare land (89 %), followed by cultivated land (56 %) and shrub land (49 %). Furthermore, the reduction in soil loss was more pronounced in steeper slopes where very steep slope and steep slope classes experienced over 70% reduction. Validation of soil erosion estimations using field observed points showed an overall accuracy of 69 %, which is fairly satisfactory. This study demonstrated the potential of watershed management efforts to bring remarkable restoration of degraded semi-arid lands that could serve as a basis for sustainable planning of future developments of areas experiencing severe land degradation due to water erosion.
机译：自过去的二十年以来，埃塞俄比亚北部的半干旱高地已广泛实施了流域管理做法，如修建石堤和设置排泄物，以遏制土壤侵蚀造成的土地退化。这项研究使用经修订的通用土壤流失方程对1990、2000和2012年在Agula流域进行的这种流域管理实践进行了评估，评估了土壤侵蚀的变化。使用从不同来源获得的空间数据，在地理信息系统中针对30×30 m栅格图层计算了经修订的通用土壤流失方程因子。结果表明，在1990-2000年期间，土壤流失率从每年约28 t ha〜（-1）显着减少了约55％，从每年28 t ha〜（-1）减少了64％在1990-2012年。土壤流失的这种变化归因于地表覆盖和石障做法的改善，导致平均C和P因子分别在1990-2000年下降了约19％和34％，而C-总体下降了在1990-2012年期间，这一比例增加了29％。裸地（89％），其次是耕地（56％）和灌木地（49％）的土壤流失明显减少。此外，土壤流失的减少在陡峭的斜坡上更为明显，在陡峭的斜坡上，非常陡峭的斜坡和陡峭的斜坡等级减少了70％以上。使用现场观察点对土壤侵蚀评估的验证显示，总体精度为69％，这是相当令人满意的。这项研究表明了流域管理工作的潜力，可以使退化的半干旱土地得到显着的恢复，这可以作为可持续规划遭受水土流失严重土地退化地区未来发展的基础。

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  • 来源
    《Environmental Management》 |2016年第5期|889-905|共17页
  • 作者

    Ayele Almaw Fenta; Hiroshi Yasuda; Katsuyuki Shimizu; Nigussie Haregeweyn; Aklilu Negussie;

  • 作者单位

    Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan,Department of Land Resources Management and Environmental Protection, Mekelle University, P.O. Box 231, Mekelle, Ethiopia;

    Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan;

    Faculty of Agriculture, Tottori University, 4-101 Koyama-cho Minami, Tottori 680-8553, Japan;

    International Platform for Dryland Research and Education, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan;

    World Agroforestry Centre (ICRAF), P.O. Box 5689, Addis Ababa, Ethiopia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Soil erosion; RUSLE model; Watershed management; Semi-arid; Ethiopia;

    机译：水土流失;RUSLE模型;流域管理;半干旱埃塞俄比亚;

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