[1]WU Xu,NIU Yaobin,GAO Zhaoliang,et al.Variation Characteristics of Soil Aggregates Under the Treatment Measures on the Expressway Engineering Accumulation Slope[J].Research of Soil and Water Conservation,2022,29(03):71-77.
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Variation Characteristics of Soil Aggregates Under the Treatment Measures on the Expressway Engineering Accumulation Slope
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 03
Page number:
71-77
Column:
Public date:
2022-04-20
- Title:
- Variation Characteristics of Soil Aggregates Under the Treatment Measures on the Expressway Engineering Accumulation Slope
- Keywords:
- soil aggregate; measure regulation; vegetation restoration; engineering accumulation; fractal dimension
- CLC:
- S157.1
- DOI:
- -
- Abstract:
- In order to quantitatively evaluate the regulating effect of the slope treatment measures, including vegetation restoration patterns, years of recovery, and the slope cutting and grading control on the soil aggregates of expressway engineering accumulation, the composition of soil aggregates of expressway engineering accumulations in different regions of Shaanxi Province was determined by dry and wet sieving methods. Meanwhile, >0.25 mm water-stable aggregate content(R0.25), soil aggregate mean weight diameter(MWD), geometric mean diameter(GMD), fractal dimension(D), and percentage of aggregate destruction(PAD)were selected to analyze the stability of soil aggregates. The results showed that compared with Agropyron cristatum, the natural restoration species of Coronilla varia and Trifolium repens significantly increased R0.25, MWD, and GMD, the increasing ranges were 12%～15%, 38%～40%, and 38%～41%, respectively, indicating that the restoration of legume herbaceous plants was beneficial to improve the soil aggregate stability. Compared with no-reclamation, the artificial reclamation species of soybean and maize significantly decreased MWD and GMD, the decrement were 13% and 12%, respectively. It showed that the slope(36°)was not suitable for reclamation to plant crops. Compared with recovery for 1 year, recovery for 2 and 5 years significantly increased R0.25 and GMD, the increment were 13% and 18%, 29% and 24%, respectively. However, there were no significant differences between recovery 2 and 5 years for the indictors of MWD, GMD, and D, indicating that the short-term restoration of Platycladus orientalis plantation was helpful to improve the soil aggregates stability. The stability of soil aggregates on the slope of short slope length(<60 m)engineering accumulation was relatively uniform in spatial distribution. Compared with ungoverned slope, the R0.25 corresponding to the platform and the slope surface increased significantly after the slope cutting and grading control, and the increasing ranges were 57%～95% and 38%～44%, respectively, which indicated that the stability of soil aggregates could be improved by engineering measures, and stability of soil aggregates on the platform was higher than that of the slope. There was a negatively correlated relationship between D and root weight density. These research results can not only provide reference for the evaluation of the soil aggregate stability of engineering accumulations, but also provide guidance for its treatment measure configuration.
- References:
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Last Update:
2022-04-20