用黄土高原的两种土壤进行室内模拟实验,研究褶皱形态特征对粒度选择性的影响

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Liying Sun, Qingyuan Dai
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引用次数: 0

摘要

目的 研究了降雨事件对溪流形态指标和粒径选择性的影响,为了解溪流形态指标对溪流侵蚀过程的影响机制提供了新的视角。结果与讨论黄土高原南部的壤质粘土(LC)由于粘土含量较高,发生了较高程度的正面侵蚀,总长度(6.65 米)也较高。黄土高原北部的沙质壤土(SL)由于含沙量较高,侧蚀程度较高,平均沟槽宽度(0.09 ± 0.00 米)也较高。两种土壤的辙沟宽度与深度之比差异不大,平均值均大于 1,这表明两种土壤的侧蚀程度相对高于下蚀程度。在两种土壤中,由于原生土壤中淤泥成分占主导地位,因此选择淤泥成分的效率远高于其他成分。而砂粒的富集比则与褶皱最大深度和等高线偏离程度呈显著负相关(P< 0.05)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effects of rill morphology characteristics on particle size selectivity using indoor simulation experiments with two types of soil from the Loess Plateau

Effects of rill morphology characteristics on particle size selectivity using indoor simulation experiments with two types of soil from the Loess Plateau

Purpose

The relations between rill morphology indicators and particle size selectivity by rainfall events were investigated, providing a new perspective on the mechanism of rill morphology indicators impacting on rill erosion processes.

Materials and methods

Indoor rainfall experiments were carried out with three-dimensional (3D) laser scanning technique for better monitoring the rill morphological indicators, using two types of soil collected from the north part and the south part of the Loess Plateau, respectively.

Results and discussions

The higher degree of headward erosion is occurred on loamy clay (LC) soil from the south part of the Loess Plateau with the higher total length (6.65 m) due to the higher clay content. Higher degree of side erosion is demonstrated on sandy loam (SL) soil from the north part of the Loess Plateau with the higher mean rill width (0.09 ± 0.00 m) due to the higher sand content. The ratios of rill width to depth do not show significant differences on two types of soil with the average value greater than 1, indicating the relatively higher degree of side erosion than downward erosion on both soils. Silt fraction is selected with much higher efficiency than other fractions in two types of soil due to the dominant silt fractions in the primary soil. Rill width (W) is the most sensitive indicator to the particle size selectivity, as both the contents of clay, silt and fine particles and the enrichment ratio of silt show significantly (P < 0.05) positive correlations with W. While, the enrichment ratio of sand fraction shows significantly (P < 0.05) negative correlations with rill maximum depth and degree of contour line departure.

Conclusions

The differences of rill morphology indicators on two types of soil slope mainly depend on soil texture and the development processes of rills.

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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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