Geomembrane Applications in Saline-Alkali Soil Improvement: Principles, Techniques, and Key Considerations

Working Principles

1. Salt Isolation:

• Geomembranes act as impermeable barriers, preventing upward migration of saline groundwater to the surface, thereby reducing topsoil salinity.

2. Moisture Regulation:

• Minimize water evaporation, maintaining stable soil hydration to dilute salts and support plant root development in harsh conditions.

Construction Methodology

1. Site Preparation:

• Clear debris (weeds, stones) and level the ground to avoid geomembrane wrinkles or punctures during installation.

2. Geomembrane Installation:

• Laying: Deploy manually or mechanically under tension to prevent slack/folds. Avoid sharp objects and wind damage.

• Seaming: Weld or overlap (≥100mm) seams securely; weigh down overlaps with sandbags.

3. Soil Covering:

• Apply 30–50cm of loose, fertile topsoil over the geomembrane for UV/wind protection and plant growth. Compact gently for adhesion.

Critical Considerations

1. Material Selection:

• Choose corrosion-resistant, thicker geomembranes for highly saline areas. Opt for semi-permeable variants if crop cultivation is planned.

2. Optimal Timing:

• Avoid extreme temperatures (heat causes deformation; cold induces brittleness) and high winds during installation.

3. Maintenance:

• Regularly inspect for damage (punctures, tears) and repair promptly. Protect overlying vegetation to sustain long-term efficacy.

Synergistic Approaches

For comprehensive results, integrate geomembranes with:
✔ Controlled irrigation to leach salts
✔ Salt-tolerant crops for ecological stabilization
✔ Soil amendments (e.g., gypsum) to enhance fertility

Title:
"Geomembranes for Saline-Alkali Land Reclamation: Mechanisms, Installation Protocols, and Operational Guidelines"

Key Advantages:
✅ Salt Barrier – Halts subsurface salt migration
✅ Water Conservation – Reduces evaporation losses
✅ Durability – Withstands corrosive environments
✅ Versatility – Compatible with agricultural and ecological restoration efforts