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Soil erodibility affected by vegetation restoration on steep gully slopes on the Loess Plateau of China

机译：中国黄土高原陡坡植被恢复影响的土壤腐蚀

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摘要

Vegetation restoration influences near soil-surface characteristics and thus likely affects soil erodibility. This study was performed to quantify the effects of vegetation restoration on soil erodibility on steep gully slopes, and to identify the potential influencing factors on the Loess Plateau. Three shrub and four grass types distributed on different gully slopes were selected, and six erodibility indicators and an integrated erodibility index (IEI) were applied to indirectly evaluate the effects of vegetation restoration on soil erodibility. The former included the soil erodibility K factor, aggregate stability (the mean weight diameter, MWD, and the mean number of drop impacts, MND), saturated hydraulic conductivity (K-s), cohesion (Coh), and penetration resistance (PR), and the latter was calculated using these indicators and a weighted integration method. The results showed that vegetation restoration on steep gully slopes was effective in reducing soil erodibility on the Loess Plateau, and grasses seemed more effective than shrubs. Compared with the control, the K of vegetation-restored gully slopes decreased by 4.1-24.0%, and MWD, MND, K-s, Coh, and PR increased by 64.0-284.3, 51.4-269.5, 100.5-417.4, 10.1-172.2, and 63.3-278.9% respectively. Consequently, the IEI of the vegetation-restored gully slopes declined by 33.1-81.9%, and the mean reduction percentage of the four grasses was 1.5 times that of the three shrubs. The variation in soil erodibility was closely related to the changes in the soil organic matter content and root mass density with vegetation restoration. The results will help in understanding the soil conservation mechanisms of vegetation restoration on steep gully slopes.
机译：植被恢复对土壤表面特性附近的影响，因此可能影响土壤易用性。本研究进行了量化植被恢复对陡峭沟壑斜坡对土壤腐蚀的影响，并确定黄土高原的潜在影响因素。选择了三种灌木和四种分布在不同的沟槽上的草型，并应用六种易用指示剂和综合腐蚀性指数（IEI），间接评估植被恢复对土壤腐蚀性的影响。前者包括土壤易蚀剂k因子，骨料稳定性（平均重量直径，MWD和平均下降撞击数，MND），饱和液压导电性（Ks），内聚力（COH）和渗透性（PR），以及使用这些指示器和加权集成方法计算后者。结果表明，陡峭的沟槽植被恢复有效降低黄土高原上的土壤蚀，而草似乎比灌木更有效。与对照相比，植被恢复的沟壑斜坡的K减少了4.1-24.0％，MWD，MND，KS，COH和PR增加64.0-284.3,51.4-269.5,100.5-417.4,10.1-172.2和分别为63.3-278.9％。因此，植被恢复的沟壑的IEI下降33.1-81.9％，四草的平均减少百分比为三个灌木的1.5倍。土壤蚀性的变化与土壤有机物质含量和根质密度的变化密切相关。结果将有助于了解植被恢复的土壤保护机制在陡峭的沟槽上的植被恢复。

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  • 来源
    《Soil Research》 |2018年第7期|共12页
  • 作者

    Zhang Bao-jun; Zhang Guang-hui; Yang Han-yue; Wang Hao; Li Ning-ning;

  • 作者单位

    Chinese Acad Sci Inst Soil &

    Water Conservat State Key Lab Soil Eros &

    Dryland Farming Loess P 26 Xinong Rd Yangling 712100 Shaanxi Peoples R China;

    Chinese Acad Sci Inst Soil &

    Water Conservat State Key Lab Soil Eros &

    Dryland Farming Loess P 26 Xinong Rd Yangling 712100 Shaanxi Peoples R China;

    Beijing Normal Univ Fac Geog Sci 19 XinJieKouWai St Beijing 100875 Peoples R China;

    Beijing Normal Univ Fac Geog Sci 19 XinJieKouWai St Beijing 100875 Peoples R China;

    Beijing Normal Univ Fac Geog Sci 19 XinJieKouWai St Beijing 100875 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农业基础科学;
  • 关键词

    revegetation; soil erosion; soil physical properties;

    机译：植物植被;土壤侵蚀;土壤物理性质;

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