Abstract
Coastal erosion results in loss of land, which impacts the economy, coastal residents and settlement plans, especially in the context of rising sea levels caused by climate change. Studying soil particle-size fractions in mangrove forests will help provide a better understanding of the relationship between soil proportions and coastal processes as well as the role of mangrove forests to support coastal planning and management. Soil samples were collected at 26 sampling plots at depths of 10 cm and 40 cm in the Cu Lao Dung (CLD), Long Phu (LP) and Vinh Chau (VC) mangrove forests in Viet Nam’s Soc Trang Province. The soil proportions based on six different particle-sizes (<0.074 mm, 0.074–0.1 mm, 0.1–0.25 mm, 0.25–0.5 mm, 0.5–1.0 mm, and >1.0 mm) were measured using a dry sieving method. Analysis showed that soil particle-sizes ranging between 0.074 and 0.5 mm made up 75–95 % of the soil sample weight at both depths. The high standard deviation values of soil proportions of each given particle-size among sampling plots indicated the soil proportions by particle-size varied widely across the sampling plots. Cluster analysis found similar pattern of soil particle-size proportions for samples collected in CLD and VC, and different pattern of soil particle-size proportions in samples collected at LP, which is more impacted by the Mekong River flow and has a thin mangrove forest belt. Non-metric dimension scaling (NMDS) analysis showed that sampling plots across the landward sites of the three mangrove forest areas were distributed in the nearby locations (Stress = 0.11). This indicated that soil proportions of particle-sizes of samples collected from areas of the natural forest composed of different species were more similar. Such similarities were not found, however, in samples collected from middle and seaward plots dominated by single-species plantations.
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Acknowledgment
The study team would like to express sincere thanks to the management board of the Project on Management of Natural Resources in the Coastal Zone of Soc Trang Province, a cooperative project between GIZ and the Soc Trang Forest Protection Sub-department, for funding this study as well as for its logistical support during the field survey. The team would also like to thank the Environmental Faculty of HCMC University of Natural Sciences for providing its laboratory for sample analysis. Special thanks go to all staff of the Project on Management of Natural Resources in the Coastal Zone of Soc Trang Province and Soc Trang Forest Protection Department, and colleagues in the Environmental Faculty, Ho Chi Minh City University of Natural Science.
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Nguyen, H.Y.T., Cao, D.M. & Schmitt, K. Soil particle-size composition and coastal erosion and accretion study in Soc Trang mangrove forests. J Coast Conserv 17, 93–104 (2013). https://doi.org/10.1007/s11852-012-0221-4
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DOI: https://doi.org/10.1007/s11852-012-0221-4