Document Type : Research Paper
Authors
1
: PhD candidate of Natural Resources Engineering, Desert Management and Control, University of Hormozgan, Hormozgan, Bandarabass, Iran.
2
Assistant Professor, Natural resources engineering group, Faculty of Agriculture and Natural Resources, University of Hormozgan, Hormozgan, Bandarabass, Iran.
3
Associated Professor, Natural resources engineering group, Faculty of Agriculture and Natural Resources, University of Hormozgan, Hormozgan, Bandarabass, Iran.
4
Research Division of Natural Resources, Hormozgan Agriculture and Natural Resources Research and Education Center
5
Forest Research Division, Research Institute of Forests and rangelands, Agricultural research, Education and Extension Organization (AREEO), Tehran, Iran.
10.22034/ijf.2023.385065.1917
Abstract
Regeneration and pneumatophore characteristics are two key factors in habitat health and development of grey mangrove forest, So the aim of this study is in order to investigate the regeneration and pneumatophore changes of grey mangrove trees affected by different severity of die back. We worked on Effects of dieback severity on regeneration and some vegetative characteristics of pneumatophores of grey mangrove (Avicennia marina Forssk. Vierh) (Study: Mangrove forest of Sirik). Halophyte and evergreen mangrove plants grow on the coasts of tropical and subtropical regions and are rich in carbon, which are very important for human survival and development due to their protective, protective and environmental role (Sheng, 2017). Today, due to climate change, human interference, excessive exploitation and the development of the tourism industry, the level of these ecosystems is decreasing (Davidson et al., 2018). The best method in the sustainability, restoration and development of mangrove forests is natural reproduction or at least human intervention in reproduction.For this purpose, after forest investigation in Sirik, Regions with different dieback severity (control, high, medium and low) were selected and 10 plots (10×10 m) were designed for each dieback severity randomly. In each plot, three microplots (1×1m) for pneumatophres and one microplot (5×5 m) for regenerations were designed and compared using Anova. Results showed that pneumatophore densities at the different distances from trees, are highest in control (p< 0.05). Also pneumatophore height was 10.84 cm in control treatment which was significantly higher than that of in other treatments. Cable root height to the sediment surface was lowest in the high severity dieback treatment (7.79cm). seedling densities, height and leaves with the amounts of 0.24 m2, 27.55 cm and 3.045, had the highest. Also, water electrical conductivity was in high dieback severity (34750 µm.cm( > medium dieback severity (30392 µm.cm)> weak dieback severity (25837 µm.cm)> control (22065 µm.cm). in according to the results, dieback has a declining rate on seedling and pneumatophore growth and densities. Also, pneumatophore densities decline affected by dieback and water salinity increase, can be the reason of trees dieback.
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