Development law of soil cracks in karst peak-cluster depressions under dry and wet alternations

• Published in: Ying yong sheng tai xue bao Vol. 34; no. 2; p. 387
• Main Authors: Luo, Shuyu, Deng, Yusong, Chen, Hongsong, Wang, Jinyue, Liao, Dalan
• Format: Journal Article
• Language: Chinese
• Published: China 01.02.2023
• Subjects: Calcium Carbonate; China; Depression; Forests; Soil - chemistry; China; soil crack; dolomite; alternating wet and dry; karst; limestone; peak cluster depression
• ISSN: 1001-9332
• DOI: 10.13287/j.1001-9332.202302.018

In an experiment with alternating dry and wet conditions of soil in cultivated land, orchards and forest lands with limestone and dolomite in karst peak depression, combined with digital image processing technology, we investigated the development law of soil surface cracks under alternating dry and wet condition. The results showed that with the alternation of wet and dry, the average width of cracks decreased at a fast-slow-slower rate, with an order of limestone > dolomite under the same land use, and orchard > cultivated land > forest soil under the same soil-forming parent rock. In the first four dry and wet alternations, the degrees of soil fragmentation and connectivity were higher in dolomite development than in limestone, with significant differences in fracture development rose diagrams. In the subsequent cycles, soil fragmentation of most samples increased, the difference dominated by parent rock gradually decreased, the crack development rose diagram converged, and the connectivity showed the patt