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Effect of Destruction and Residual Geomembrane on Soil Organic Matter, Evaporation Cracking, and Aggregates Under Dry–Wet Cycles
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DOI：10.3390/fractalfract10080529.png)
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Abstract
En 中文
Geomembranes are widely used in water storage ponds and irrigation systems in arid and semi-arid regions. The residual damage of geomembranes will lead to soil pore blockage, water infiltration obstruction, and soil degradation. This study investigated the effects of geomembrane residues at different depths on soil under drought and rainfall conditions. Using a ZHS multifunctional climate chamber to simulate dry–wet cycles, the effects of residual geomembranes on soil evaporation and cracking processes were investigated, along with their impacts on soil aggregates and aggregate-associated organic carbon. Results showed that with increasing residual geomembrane content, the Mean Weight Diameter (MWD) of aggregates decreased by 3.95%, 28.25%, and 51.41%, and the Geometric Mean Diameter (GMD) decreased by 10.59%, 42.35%, and 61.18%, respectively, compared to the residual geomembrane-free treatment. Organic carbon content in all aggregate size fractions consistently declined. Under the same dry–wet cycling conditions and soil thickness, residual moisture content decreased with higher residual geomembrane addition. Meanwhile, residual geomembrane enrichment promoted soil cracking, as evidenced by increased crack ratio and fractal dimension, and the initial evaporation rate increased with increasing residual geomembrane content. Compared to the control group, residual geomembrane significantly reduced residual moisture content, reducing it by 4.48–29.37%, 7.14–21.92%, and 4.19–35.95%, respectively. The final crack ratio increased by 5.33–58.89%, 0.97–63.39%, and 0.87–72.46%, respectively. Meanwhile, the final fractal dimensions increased by 0.50–15.26%, 2.92–15.96%, and 3.22–13.33%, respectively. Mechanistically, residual geomembrane fragments occupy soil pores and reduce interparticle cohesion, thereby promoting the expansion of crack ratios and disrupting aggregate stability, which accelerates organic carbon decomposition. This study provides scientific insights into how residual geomembranes affect soil ecosystems and supports agricultural soil conservation and management.
Keywords:
residual geomembrane
organic carbon
aggregate stability
soil evaporation
soil cracking
fractal dimension
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