The mangrove ecosystem is highly impacted by climate change phenomena, especially the rise of sea levels and the severity of extreme weather events like cyclones. The overall coastal areas of Asia are mostly suffered by sea level rise and land degradation. During 1989 to 2007, around 70% of coastal land is deformed in West Bengal, India. Similarly, 7 mm of sea level rise was observed in Sundarbans during the said time period. Moreover, social pressure and deforestation are posing a threat to this ecosystem. This study appraises the role, status, and extent of the nursery developed in Indramayu Regency, West Java Province, Indonesia, and evaluates its similarities or differences with Indian Sundarbans. As mangrove naturally grows in the intertidal zone where sea water in the ocean meets the land, the nursery for mangrove seedlings also needs saline water to grow. Generally, seedlings are grown at moderate salinity, and those seedlings show better vegetative performance than seedlings grown under very high or low salt concentrations. The role of shading in developing mangrove nurseries was evaluated in this study. For example, Rhizophora apiculata seedlings prefer 75% shading. The key mangrove species grown in nursery in Indramayu are Avicenna marina (Forssk) Vierh, Avicennia alba Blume, Bruguiera gymnorhiza, Rhizophora apiculata Blume, Rhizophora mucronata Lam., and Rhizophora stylosa Griff. In contrast, in India the prominent mangrove species are Heritiera fomes, Xylocarpus mekongensis, Xylocarpus granatum, Sonneratia apetala, Bruguiera gymnorhiza, etc. In both countries, seedlings are grown in polybags with drainage holes filled with local soil. Mangrove restoration in the Indian Sundarbans is boosted by using grasses, especially in the erosion-riddled and nutrient-deficient patches. The intervention of local colleges and universities would also help the restoration process. In Indonesia, the Directorate of Conservation Areas and the Ministry of Forestry have disseminated guidelines for mangrove nurseries. Likewise, the Indian Government may involve local educational Institutions for this purpose. The demand for good-quality mangrove-seedling growers will increase in the future, and in turn, it will be very helpful to enhance the income of local inhabitants. The continuous involvement of mangrove experts, universities, and the government, as well as mangrove-related institutions, is needed to improve the quality of mangrove seedlings, which ensures the success of the rehabilitation of the Indramayu mangrove forest and Indian Sundarbans.

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Protecting Mangrove Ecosystems Through Proper Nursery Management in Karangsong and Pabean Ilir of Indramayu Regency: A Comparative Study with Indian Sundarbans with Remote Sensing Approaches

  • Reginawanti Hindersah,
  • Mochamad Candra Wirawan Arief,
  • Sondi Kuswaryan,
  • Saon Banerjee,
  • Saroni Biswas,
  • Piyali Sarkar

摘要

The mangrove ecosystem is highly impacted by climate change phenomena, especially the rise of sea levels and the severity of extreme weather events like cyclones. The overall coastal areas of Asia are mostly suffered by sea level rise and land degradation. During 1989 to 2007, around 70% of coastal land is deformed in West Bengal, India. Similarly, 7 mm of sea level rise was observed in Sundarbans during the said time period. Moreover, social pressure and deforestation are posing a threat to this ecosystem. This study appraises the role, status, and extent of the nursery developed in Indramayu Regency, West Java Province, Indonesia, and evaluates its similarities or differences with Indian Sundarbans. As mangrove naturally grows in the intertidal zone where sea water in the ocean meets the land, the nursery for mangrove seedlings also needs saline water to grow. Generally, seedlings are grown at moderate salinity, and those seedlings show better vegetative performance than seedlings grown under very high or low salt concentrations. The role of shading in developing mangrove nurseries was evaluated in this study. For example, Rhizophora apiculata seedlings prefer 75% shading. The key mangrove species grown in nursery in Indramayu are Avicenna marina (Forssk) Vierh, Avicennia alba Blume, Bruguiera gymnorhiza, Rhizophora apiculata Blume, Rhizophora mucronata Lam., and Rhizophora stylosa Griff. In contrast, in India the prominent mangrove species are Heritiera fomes, Xylocarpus mekongensis, Xylocarpus granatum, Sonneratia apetala, Bruguiera gymnorhiza, etc. In both countries, seedlings are grown in polybags with drainage holes filled with local soil. Mangrove restoration in the Indian Sundarbans is boosted by using grasses, especially in the erosion-riddled and nutrient-deficient patches. The intervention of local colleges and universities would also help the restoration process. In Indonesia, the Directorate of Conservation Areas and the Ministry of Forestry have disseminated guidelines for mangrove nurseries. Likewise, the Indian Government may involve local educational Institutions for this purpose. The demand for good-quality mangrove-seedling growers will increase in the future, and in turn, it will be very helpful to enhance the income of local inhabitants. The continuous involvement of mangrove experts, universities, and the government, as well as mangrove-related institutions, is needed to improve the quality of mangrove seedlings, which ensures the success of the rehabilitation of the Indramayu mangrove forest and Indian Sundarbans.