Short-term effect of oil-mulch on vegetation dynamic; Integration of
ecological and remote sensing-based approaches
Abstract
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.