plant characteristics of magrove at Dong Long commune, Tien Hai district, Thai Binh province

Abstract

The mangrove forest natural area at Dong Long commune, Tien Hai
district, Thai Binh province is almost the planted forests. The diversity of species compositions is high; the flora of mangrove forests has 66 species belongs to 33 families distributed following 7 community groups. Nevertheless, the plant communities at natural forests showed the most development with 8 species of tracheophyta in two plant assemblages of Trang (Kandelia obovata) - O ro (Acanthus ebrateatus) and Co ngan (Scirpus kimsonensis) - Co cay (Sporobolus virgicicus). The relationships between species of natural forest were highest with the most stable structure of the forest, and the best growth of trees comparated with other mangrove ecology systems. In the reservoirs of aquaculture, the mangrove flora developed towards the degenerated successions with 11 species of two plant assemblages of Trang - Su (Aegiceras cornicudatum) and O ro - Say (Phragmites karka); or only included one assemblage as Trang - Ban (Sonneratia caseolaris) combined with 8 species in a mixed plantations of Trang and Ban; or Trang combined with three other species on the mono plantation of Trang on the alluvial ground.