期刊论文

Propagation and Closure Law of Cracks in the Paddy Soil During Drying-Wetting Cycle

中文

水土保持研究

1005-3409

2020

27

02

370-376

10.13869/j.cnki.rswc.2020.02.052

41601215:国家自然科学基金 41771261:国家自然科学基金 2016CFA027:湖北省自然科学基金 CCNU17TS0001:中央高校基本科研业务费专项华中师范大学项目 CCNU19TS005:中央高校基本科研业务费专项华中师范大学项目 CCNU18QN002:中央高校基本科研业务费专项华中师范大学项目

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为研究江汉平原稻田土壤在干湿交替过程下的裂隙发育规律,利用室内试验和数字图像处理方法对典型稻田耕作层和犁底层土壤裂隙特征进行了定量研究。结果表明:在干燥过程中,土壤裂隙形成初期裂隙长而窄,随着土壤含水量的降低,裂隙面积率和当量宽度逐渐增大;在增湿过程中,随着土壤含水量的增加,裂隙面积率和当量宽度逐渐减小,但裂隙长度密度降幅较小。干湿交替条件下的裂隙形成和闭合过程不可逆,且干燥形成的土壤裂隙并不能通过增湿完全闭合。土壤有机质含量和容重差异影响了耕作层和犁底层裂隙开闭特征。在干燥过程中,耕作层土壤裂隙面积率、长度密度和当量宽度分别为16.1%,0.076 mm/mm^2,2.13 mm...

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 crac...