Use of Salt-Marsh Site Classification for Mangrove Forest Development and Reforestation in the Coastal Area of Thai Binh Province in the Context of Climate Change

Abstract

This Salt-marsh site classification is an important scientific basis for the effective and sustainable management of salt-marsh in the coastal area. The main aim of this research is to use of salt-marsh site classification to select suitable mangrove species for mangrove forest development and reforestation in the coastal area of Thai Binh province. Quantification method and six indicators of salt-marsh site classification such as type of salt-marsh, current status of mangrove forest and salt-marsh, exposed time of mudflat, soil maturity, sand percentage, altitude of mudflat and mapping of salt-marsh site classification of Thai Binh province (Dong Long commune, Tien Hai district, Thai Binh province, the scale of 1/5,000). Planting techniques for Kandelia obovata Sheue, H.Y. Liu & J. Yong, and Sonneratia caseolaris (L.) Engl such as cutting the top bud at the early stage of planting, using 3 bamboo stakes to stabilize trees were used. Survival rate increased 27% after 3 years of planting compared with control. The growth of mangrove forests in the experiment formula is very different, especially the site type group is very convenient, convenient and difficult, the survival rate of the experiment formula in the field type is favorable and very convenient from 60 - 70% after 3 years of planting mangrove forests, while the difficulty in survival is 10-20%. The probability of accretion in the experimental models is very clear, in the site type group is very favorable after 36 months of mangroves planting from 9.1 to 10.0 cm, clearly higher than the control (3,9cm). In the site-wise group, the increase of accretion from 6.8 to 7.1 cm was significantly higher than control (3.0 cm). In the difficult site group, the average accretion volume in the following 36 months of planting was 4.3 - 4.5 cm, clearly higher than the control (2.1 cm).