[1]WAN Yanping,ZHAO Yangyi,DUAN Xu,et al.Effect of Plant Roots and Gravels on the Formation of Soil Preferential Flow Paths in Arid Valley of Honghe River[J].Research of Soil and Water Conservation,2022,29(01):140-147.
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Effect of Plant Roots and Gravels on the Formation of Soil Preferential Flow Paths in Arid Valley of Honghe River
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 01
Page number:
140-147
Column:
Public date:
2022-02-20
- Title:
- Effect of Plant Roots and Gravels on the Formation of Soil Preferential Flow Paths in Arid Valley of Honghe River
- Keywords:
- drought river valley; preferential flow paths; gravel; root length density; root weight density
- CLC:
- S714.7
- DOI:
- -
- Abstract:
- The purpose of this study was to investigate the effect of the characteristics of plant roots and gravels on the formation of soil preferential flow paths in forest in arid river valley of Honghe River. Based on the staining tracer method, the location and quantity of the preferential flow paths of the soil in the study area were determined, and the relationship between the root system and gravel volume content in the stained area was analyzed quantitatively. The results show that:(1)the development degree of woodland preferential flow paths is obviously better than that of wasteland; the connectivity of the preferential flow paths is also different in different dyeing radius; In the wastrel, the connectivity of the preferential flow paths decreases in the order: 1～2.5 mm, ≤1 mm, 2.5～5 mm, 5～10 mm, >10 mm; in the forest land, the connectivity of the preferential flow paths decreases in the order: 1～2.5 mm, 2.5～5 mm, ≤1 mm, 5～10 mm, >10 mm; the number of preferential flow paths is negatively correlated with the depth of soil layer and the radius of staining in the same soil layer;(2)in the stained area of forestland, the total gravel volume content decreases with the increase of soil depth, while in the stained area of wasteland, the total gravel volume content increases in the 20—30 cm soil layer, and the volume contents of rest particle sizes decrease with the increase of soil depth;(3)the root length density and root weight density decrease monotonously with the increase of soil depth and root diameter; the root length densities of plants under different diameters are higher in woodland than those in wasteland;(4)the main influencing factors on the number of preferential flow paths in the forest land are the root weight density within the root diameter range ≤1 mm and the gravel volume content with the diameter of 5～10 mm. The main influencing factors in wasteland plots are root weight densites of the roots with the diameter ranges of ≤1 mm and 1～3 mm, volume contents of gravels with the diamter range of 2～5 mm, and root length densities of roots with the diamer range of 1～3 mm. Therefore, the gravel distribution in the sample plot has obvious spatial heterogeneity, and the fine roots are more likely to promote the formation of the preferential flow paths, and the root system and gravel together influence the formation of the preferential flow paths.
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Last Update:
2022-02-20