This study investigates the effects of oil mulch on wind erosion control and soil properties in the Abu-Ghoveir area of Dehloran, Ilam. Following mulch application, soil samples were collected monthly over a year from three treatments (mulched, control, and afforestation) at two depths (0–10 cm and 10–50 cm). Soil parameters, including temperature, moisture, pH, electrical conductivity (EC), organic matter (OM), sodium (Na), and sodium adsorption ratio (SAR), were measured. Wind erosion threshold velocity was also determined using a wind tunnel. The findings revealed that oil mulch significantly influenced certain physical and chemical soil properties and effectively increased the threshold wind velocity. The optimal mulch application rate was estimated at 7 tons per hectare. Oil mulch application reduced evaporation, increased surface soil moisture, and provided a suitable substrate for the recovery of native vegetation in arid regions.

This study investigates the long-term effects (5, 20, and 40 years) of petroleum mulching and biological fixation (PM-BF) on the chemical, physical, and mineralogical characteristics of stabilized sand dunes in Khuzestan Province, Iran. The results revealed that PM-BF significantly improved vegetation cover and enhanced soil properties such as organic matter, cation exchange capacity, clay content, and electrical conductivity. However, petroleum mulch introduced heavy metals (Ni, Cd, Pb), which peaked in younger PM-BF regions but gradually decreased over time due to leaching. Dust fallout also contributed to the formation of specific clay minerals such as palygorskite and smectite. Although PM-BF supports ecosystem recovery and reduces dust-related impacts, the potential accumulation of toxic metals raises concerns for agricultural and environmental uses.

The soil seed bank (SSB) is a valuable reservoir of seeds hidden in the soil, playing a crucial role in vegetation establishment under adverse environmental conditions. However, limited knowledge exists regarding the effects of restoration measures on SSB, particularly in arid ecosystems. This study examines the impacts of oil mulching (1 and 3 years after application) and plantations (15-year-old) on the diversity and composition of SSB and aboveground vegetation (AGV) compared to non-restored areas. The results indicate that species richness was low in the studied area (36 species from 16 families), with SSB contributing less than AGV (11 and 34 species, respectively). The highest number of exclusive species was observed in the plantation treatment, while the lowest was recorded in the 1-year mulching treatment. The diversity indices revealed that the highest values occurred in the plantation and 3-year mulching plots. Seed density was significantly greater in the plantation area compared to the other treatments. The analysis of plant composition demonstrated that the plantation treatment was distinct from other treatments, with the 3-year mulching site being the closest to it. These findings suggest a trade-off between the short-term and long-term effects of oil mulching, where initial negative impacts diminish over time, leading to positive ecological outcomes. Ultimately, oil mulching, in combination with afforestation, fosters a favorable microclimate, improving AGV and SSB diversity and composition.

This article investigates the impact of oil mulching with petroleum products on water quality. Oil mulch, composed of heavy petroleum byproducts, has the potential to contaminate water resources with heavy metals and hydrocarbons. The study examined oil mulch samples from various regions in Khuzestan Province over short-term, medium-term, and long-term periods, as well as samples from the Abadan refinery under laboratory conditions simulating natural environments with a 24-hour contact time with water. The results revealed that oil mulch does not significantly increase water pollution in terms of heavy metals, and the levels of hydrocarbons detected were below permissible limits. The study concludes that while oil mulch may contribute to minor increases in certain pollutants, it does not pose a significant threat to water quality in terms of heavy metals and hydrocarbons.

This article investigates the effects of petroleum mulch on vegetation and soil in the sandy deserts of Samad Abad, Sarakhs, in Khorasan Razavi province. Petroleum mulch is a common method for stabilizing mobile sands in Iran, but its effects on vegetation and soil have been less studied. In this research, sampling was conducted in both mulched and control areas to assess vegetation cover and soil attributes. The results showed that while there was no significant difference in total vegetation cover and the density of dominant species such as Astragalus squarosus and Convolvolus hamadae between the mulched and control areas, the total volume and green matter of plants were significantly higher in the mulched area. Additionally, the organic matter content in the soil at a depth of 20-80 cm was significantly higher in the mulched area compared to the control. These findings suggest that petroleum mulch can improve plant growth conditions and increase soil organic matter.