Generally, soil decompaction is performed as part of a site development project. The process involves the removal of the compacted soil, which consists of the mineral horizon, subsoil, and topsoil. Decompaction is done using a variety of methods, such as hand digging, excavators, and tyned equipment.
Decompaction procedures vary depending on the scale of the project, the soil type, and the compaction issue.
The goal of decompaction is to reconstruct porous permeable soil profiles. Recovery rates of compacted soil depend on several factors, including the soil’s physical properties and the presence of vegetation. In some cases, the recovery process can take years or even decades. In other cases, the rate may be faster or slower than the original decompaction. For some soils, the recovery process may be accelerated by the addition of granular materials to the soil.
Soil compaction is a serious threat to ecological and hydrological functioning. It is characterized by restricted water infiltration, limited root penetration, and a lack of structure. Compaction occurs as a result of industrial disturbance on mineral soils. The most pronounced effects of soil compaction occur on sites with high soil moisture and high clay content. In addition, soil compaction can be induced by previous grading practices or static compaction forces. It can also be triggered by traffic pressure.
There are two basic types of soil decompaction: mechanical and organic. Mechanical decompaction is performed by using a variety of methods, including pneumatic decompaction devices, which fracture soil layers by introducing nitrogen and pressurized air. The air pressure creates fractures, which can be filled with water or fertilizer. This method can be used to decompact soil beneath landscape trees.
Organic decompaction, on the other hand, is the natural process of decompaction. It takes about seven years to recover a compacted soil. Several authors recommend the addition of an organic component to decompaction work. Several websites provide details on these approaches. The organic component is especially important for cultivation using an excavator bucket. However, organic decompaction may take longer for a tree to stabilize its natural balance.
Soil decompaction may involve soil modification through air tillage, fertilizer, and mulching. These methods are used to modify the soil’s mineral horizon, improve pore size distribution, and enhance soil structure. These methods are also used to promote active soil life, which helps restore the soil to a self-sustaining ecosystem. Adding soil amendments can improve soil biome and stormwater services. These methods are effective in areas with heavy site use.
Depending on the type of decompaction technique, the recovery process may take several years or decades. In addition, it is important to understand the costs of soil decompaction. These costs vary depending on the soil type, climate, and level of mechanization.
Recovery of compacted soil varies across the different soil physical properties, and statistical analyses indicate trends for recovery of functional soil properties. However, recovery rates do not generally increase with time.
Statistical analyses indicate that the recovery rate of soil penetration resistance is not associated with recovery of the other functional soil properties.
The amount of recovery may vary depending on the soil physical properties, including total porosity, air permeability, and penetration resistance.
