Mapping the sensitivity of mangroves of the Hormozgan Province to environmental ‎hazards based on the canopy cover percentage

The present study was conducted to classify the sensitivity degree of mangrove habitats of the Hormozgan province based on canopy percentage (as an indicator of the structural characteristics of forest). For this purpose, by field survey and recording of mangrove crown diameter in the sample plots, the percentage of canopy cover in each sample plot was calculated. Then, by analyzing satellite images and mapping NDVI of habitats, a regression relation was fitted between the percentage of canopy cover in the sample plots and the corresponding NDVI values ​​at each vegetation level and by applying the regression relation on the NDVI map, canopy cover percentage spatial changes were mapped at each habitat. Finally, the map of the susceptibility of the Khamir, Tiab, and Jask habitats to three classes of low, medium and high was prepared using the mangrove canopy cover map and GIS techniques. The results showed that the average percentages of the canopy cover in the Khamir, Tiab, and Jask were 62, 43, and 71%, respectively, that indicate that Jask and Tiab have the lowest and highest sensitivity to environmental stresses and disturbances, respectively. Local geomorphologic features, sediment yield, coastal installations, economic and social conditions of the area, environmental pollutants, and sea level rise are among the influencing factors that cause differences in the degree of susceptibility between habitats. Producing accurate information on the sensitivity of mangrove habitats of Iran, this study has provided preliminary prerequisites for implementing climate change adaptation programs and prioritize conservation and restoration activities of mangroves.