Current Status of Mangroves in the Context of Climate Change in Xuan Thuy National Park Buffer Zone, Nam Dinh Province, Vietnam
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Mangroves form part of climate-change adaptation and mitigation measures but themselves are affected by climate change. Xuan Thuy National Park (XTNP) is the largest coastal wetland ecosystem in the north of Vietnam. Since the 1990s, several new plantings of mangroves have been established in the park; the dominant species used has been Kandelia obovata Sheue, Liu & Yong. In this study, the current state of an 18-22 year old plantation was examined. Kandelia obovata remains the dominant mangrove species. However from the sea landward, the density of trees decreases from 54,764 to 4,738 trees/ha. Loss of trees is linked to infestations by pest species of Cerambycidae, Coleoptera and Cossidae, Lepidoptera. A second mangrove species, Rhizophora stylosa Griff has the largest number of regenerating seedlings, though there is no advanced regeneration of any species. The potential for natural regeneration of K. obovata appears to be low. Loss of forest may be linked to climate-change phenomena. Cyclones, lightning, typhoons, and other extreme weather have led to stem and branch breakage and tree death, and indirectly to reduced resistance to pest and disease attack, leading to widespread degradation and loss of capacity for natural recovery to occur.
KeywordsMangroves plantation Xuan Thuy National Park pests and diseases climate change
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We are grateful to Drs Chris Beadle (CSIRO), Trieu Thai Hung (SRI, VAFS) and three anonymous reviewers for valuable comments on an earlier draft of the manuscript.
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