[1]DUAN He,LIU Muxing,YI Jun,et al.Propagation and Closure Law of Cracks in the Paddy Soil During Drying-Wetting Cycle[J].Research of Soil and Water Conservation,2020,27(02):370-376.
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Propagation and Closure Law of Cracks in the Paddy Soil During Drying-Wetting Cycle
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 02
Page number:
370-376
Column:
Public date:
2020-03-30
- Title:
- Propagation and Closure Law of Cracks in the Paddy Soil During Drying-Wetting Cycle
- Keywords:
- soil crack; drying-wetting cycle; soil moisture; paddy field; Jianghan Plain
- CLC:
- S152.4; S152.7
- DOI:
- -
- Abstract:
- To study the developmental principle of soil cracks in the paddy field of Jianghan Plain during drying-wetting cycles, quantified results of soil crack parameters at plow layer and plow pan in typical paddy fields were obtained with the methods of simulated experiment and digital image analysis. The results showed that, during the drying process, the long and narrow cracks were formed during the initial stage of drying, while the area densities and equivalent widths of these cracks increased continuously in the further drying period; in the wetting process, the crack area density and equivalent crack width decreased gradually with the increase of soil water content, but the crack length density remained stable. The processes of soil crack forming and crack closing were irreversible during the drying-wetting cycles, and the formed cracks couldn't close completely after wetting process. The differences of soil organic matter content and bulk density were the dominant factors affecting the crack characterizations between plow layer and plow pan. During the drying process, the soil crack area density, length density and equivalent width of plow layer were 16.1%, 0.076 mm/mm2, and 2.13 mm, respectively, which were about 1.63 times, 1.09 times, and 1.54 times of those in the plow pan. Higher close rates of soil cracks were observed in the plow pan than those in the plow layer after the re-wetting process. The reduced rates of crack area, crack length density, and equivalent crack width of the plough pan(plow layer)were 61.6%(39.8%), 20.0%(7.9%), and 53.6%(35.7%), respectively. The reasonable soil water content should be maintained in the paddy fields for preventing soil crack formation, especially crack formation of plow pan during the drying seasons in winter and spring, as soil crack was a preferential way for water and fertilizer percolation.
- References:
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Last Update:
2020-02-25