Wind erosion is one of the desertification results and is among the natural processes that mostly occur under dry conditions and high wind velocity. Using oil-mulches is one of the common methods to stabilize sand dunes. The current study aimed to investigate the short-term effects of oil-mulch on vegetation attributes (i.e., cover and diversity) and rangeland condition score (RCS) using integrated ecological and remote sensing-based approaches in arid regions of Southwestern Iran. A vegetation survey was carried out in 2019 in the oil-mulched and control area, and a remotely sensed vegetation index (MSAVI) was calculated for 2017 and 2019. The results indicate that one year after treatment, compared to the control area, vegetation cover (30 ± 17.11 vs. 17 ± 5.44 %) and litter (4.6 ± 2.18 vs. 0.94 ± 1.55 %) increased significantly in the oil-mulched area, while bare soil (65.20 ± 17.34 vs. 82.31 ± 5.84 %) decreased. Further, diversity indices (Species evenness, Shannon, and Simpson indices) declined by applying oil-mulch (88%, 63%, and 71%, respectively). The rangeland condition score was significantly higher in the oil-mulched area than in the control area (22 ± 1.86 vs. 12 ± 0.88; P < 0.001). Comparing MSAVI between 2017 and 2019 showed that vegetation cover increased 44.8%. Based on the results, it can be suggested that planting native palatable species in an oil-mulched area with the exclusion of livestock grazing is likely to increase the benefits of oil-mulch treatment and will lead to better rangeland condition score.

This study investigates the use of modified bentonite impregnated with petroleum as an eco-friendly mulch to stabilize wind-erodible sands. The modified clay demonstrated the ability to adsorb petroleum up to five times its own weight and resisted wind erosion at speeds up to 16.7 m/s without soil loss. In contrast, untreated sands began eroding at 10.3 m/s. Additionally, the mulch significantly reduced the leaching of polycyclic aromatic hydrocarbons (PAHs) into drainage water. The findings suggest that petroleum-impregnated modified bentonite mulch offers a sustainable and efficient method for controlling wind erosion in arid regions.

This study focuses on sand dune stabilization projects in the Baiji District of Iraq, aiming to reduce the mobility of shifting sands and mitigate wind erosion. Petroleum-based mulches were applied to create a surface crust that effectively immobilized sand movement. The findings confirmed the effectiveness of petroleum mulch in protecting infrastructure and farmland from encroaching dunes. The paper also discusses environmental concerns, mulch durability, and the potential for integrating vegetation in stabilization efforts.

Abstract:

One of the major challenges in Iran’s arid and desert regions is the control of moving sand dunes. The use of petroleum mulch, either alone or in combination with other biological or mechanical methods, can be effective in reducing wind erosion and stabilizing mobile sands. Petroleum mulch refers to by-products of heavy petroleum derivatives that are applied to the soil surface to prevent erosion and fix shifting sands. Although the process of mulching is complex and costly, its results in sand stabilization have been satisfactory. Despite the widespread use of petroleum mulch and its observed impact on vegetation, comprehensive environmental studies on its effects are still lacking. This paper aims to explore not only the application of petroleum mulch in wind erosion control and sand stabilization but also to evaluate its environmental impacts.

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Keywords:

Environmental impacts, shifting sands, petroleum mulch, wind erosion, sand stabilization

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1. Introduction

Wind erosion and the movement of sand dunes are critical environmental issues that not only degrade agricultural lands but also negatively affect air and water quality. Therefore, applying effective methods to manage this phenomenon is essential.

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2. Petroleum Mulch

Petroleum mulch, as a protective material, can form a barrier over the soil surface, preventing degradation and erosion. This paper examines the mechanisms through which petroleum mulch functions to stabilize the soil and reduce wind erosion.

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3. Environmental Impacts

Alongside its practical benefits, the environmental consequences of petroleum mulch must be considered. Potential pollution, effects on local ecosystems, and the impact on groundwater quality are among the concerns reviewed in this paper.

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4. Conclusion

Petroleum mulch proves to be an effective solution for controlling wind erosion and stabilizing sand dunes. However, its environmental aspects must be carefully assessed to prevent potential negative impacts. This paper seeks to offer strategies for optimizing its use in alignment with environmental conservation.

This report, part of the 1973 FAO/UNDP Seminar, explores the distribution, properties, and stabilization efforts of sandy soils and sand dunes in Iran. It covers soil classifications, protective measures, and R&D projects such as petroleum mulching, mechanical windbreaks, and plantation of resilient species. Since 1959, Iran has made significant efforts to combat desertification and stabilize moving sand dunes in regions like Ahvaz, Sabzevar, and Qazvin.
Furthermore, in an official FAO report to the Government of Iran in 1971, the use of petroleum mulch was recommended, provided that the mulch layer can retain moisture and remain stable until full seed germination and seedling establishment.