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首页> 外文期刊>Journal of soil & sediments >Quantification of the effect of soil erosion factors on soil nutrients at a small watershed in the Loess Plateau, Northwest China
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Quantification of the effect of soil erosion factors on soil nutrients at a small watershed in the Loess Plateau, Northwest China

机译：黄土高原小流域土壤侵蚀因子对土壤养分的影响定量

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摘要

Purpose This research aimed to quantitatively assess the effect of soil erosion factors on soil nutrients under similar rainfall conditions at a small watershed in the Loess Plateau, China, with emphasis on quantification of each factor's contribution to soil nutrients. Materials and methods Forty-five soil samples were collected and the soil texture and nutrients were analyzed. The integrated fertility index (IFI) was quantified with laboratory-measured available phosphorus, available potassium, total nitrogen, and soil organic matter based on principal component analysis and the soil erosion factors were computed. The feature importance of soil erosion factors that affect soil nutrients was estimated based on the gradient-boosting decision tree (GBDT) method. Results and discussion The GBDT optimized model revealed that the feature importance of soil erosion factors soil erodibility (K), slope length (L), slope steepness (S), vegetation cover (C), and mechanical erosion control (P) was 0.41, 0.11, 0.03, 0.39, and 0.06, respectively. The K and C factors occupied 80% of the importance and were the two predominant soil erosion factors affecting the soil comprehensive nutrients. The Pearson correlation coefficient between K, L, S, C, or P, and IFI was - 0.387, - 0.23, - 0.25, - 0.479, and - 0.532, respectively. The different order of factors between the Pearson correlation and feature importance may indicate that linear relation cannot be used to indicate the significance of each factor. Conclusions The soil erodibility and the vegetation cover could basically determine the quality of soil nutrients in the small watershed under similar rainfall conditions. The soil property itself and associated effects on the amount and rate of runoff under a certain rainfall erosivity had a dominant impact on the soil nutrients. Factor C greatly contributed to runoff resistance and protection of nutrients from erosion. The L, S, and P factors had weak effects on the IFI because of the generally low rainfall intensity, short rainfall duration, and other factors that may counteract the effects in the area.
机译：目的本研究旨在定量评估在黄土高原小流域类似降雨条件下土壤侵蚀因子对土壤养分的影响，重点是量化每种因子对土壤养分的贡献。材料和方法收集了45个土壤样品，并分析了土壤质地和养分。在主成分分析的基础上，利用实验室测得的有效磷，有效钾，总氮和土壤有机质对综合肥力指数（IFI）进行了量化，并计算了土壤侵蚀因子。基于梯度提升决策树（GBDT）方法，估算了影响土壤养分的土壤侵蚀因子的特征重要性。结果与讨论GBDT优化模型表明，土壤侵蚀因子的特征重要性为土壤侵蚀性（K），坡长（L），坡度（S），植被覆盖（C）和机械侵蚀控制（P）为0.41，分别为0.11、0.03、0.39和0.06。钾和碳因子占重要性的80％，是影响土壤综合养分的两个主要土壤侵蚀因子。 K，L，S，C或P与IFI之间的Pearson相关系数分别为-0.387，-0.23，-0.25，-0.479和-0.532。皮尔逊相关性和特征重要性之间的因素顺序不同，可能表明线性关系不能用于指示每个因素的重要性。结论在相似的降雨条件下，土壤的易蚀性和植被的覆盖度可以基本决定小流域土壤养分的质量。在一定的降雨侵蚀力下，土壤本身的性质及其对径流量和速率的相关影响对土壤养分具有显着影响。因子C极大地有助于抵抗径流并保护养分免受侵蚀。 L，S和P因素对IFI的影响较弱，这是因为降雨强度普遍较低，降雨持续时间短以及其他可能抵消该地区影响的因素。

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  • 来源
    《Journal of soil & sediments》 |2020年第2期|745-755|共11页
  • 作者

    Wang Ziguan; Wang Guangcai; Zhang Yongguang; Wang Ruixue;

  • 作者单位

    Beijing Normal Univ Fac Geog Sci Beijing 100875 Peoples R China|Kunming Univ Sci & Technol Fac Land Resource Engn Kunming 650093 Yunnan Peoples R China;

    China Univ Geosci State Key Lab Biogeol & Environm Geol Beijing 100083 Peoples R China|China Univ Geosci MOE Key Lab Groundwater Circulat & Environm Evolu Beijing 100083 Peoples R China;

    Capital Normal Univ Informat Engn Coll Beijing 100048 Peoples R China;

    Kunming Univ Sci & Technol Fac Land Resource Engn Kunming 650093 Yunnan Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gradient boosting decision tree; Quantitative assessment; Soil erosion factors; Soil nutrients;

    机译：梯度提升决策树;定量评估;土壤侵蚀因子;土壤养分;

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