Effect of Road Construction Passing through Mangrove Forest on Some Soil Properties of Coastal Land and Inner Land at Bang Pu Sub-district, Mueang Samut Prakan District

Abstract

The effect of road construction pass through mangrove forest on some soil properties of coastal
land and inner land at Bang Pu sub-district, Mueang Samut Prakan district was conducted for the objective
of study in some soil properties including water content in sediment, soil organic matter, soil electrical
conductivity and soil reaction in coastal land and inner land area. The soil samples were collected from
the 1st to the 4th year after road construction. The results showed that the mangrove soil was classified as
Bang Prakong soil series. The water content in sediment in topsoil of inland areas has continuous
decreased throughout 4 years. After 4 year road construction, inland areas water content in sediment in
topsoil was 40.50±3.14% and subsoil was 68.51±2.45%, while coastal areas water content in sediment in
topsoil was 60.56±3.64% and subsoil was 68.11±2.45%. The organic matter in topsoil of coastal areas was
lower than inland areas throughout 4 years, with value of 2.50±0.08% to 2.76±0.11%. Organic matter of
inland areas was higher and increased from the 1st year with 2.63±0.10% to the highest value 5.33±0.10%