Growth of salt-secretor and non-salt secretor mangrove seedlings with varying salinity and their relations to habitat zonation

1st International Conference on Fisheries and Marine Science

Basyuni, M.^1 ; Ramayani^1 ; Hayullah, A.^1 ; Prayunita^1 ; Hamka, M.^1 ; Putri, L.A.^2 ; Baba, S.^3

Department of Forestry, Faculty of Forestry, University of Sumatera Utara, Jl. Tri Dharma Ujung No. 1 Medan North Sumatera, 20155, Indonesia^1

Department of Agroecotechnology, Faculty of Agriculture, University of Sumatera Utara, Medan

20155, Indonesia^2

International Society for Mangrove Ecosystems, Faculty of Agriculture, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa

903-0213, Japan^3

关键词: Habitat zonations;    Mangrove species;    Propagules;    Salt concentration;    Salt tolerant;    Species distributions;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/236/1/012050/pdf
DOI  :  10.1088/1755-1315/236/1/012050

来源: IOP

【 摘 要 】

The growth of six mangrove seedlings under varying salinity was studied concerning the habitat zonation. Healthy and mature propagules and seeds of selected mangroves, Rhizophora apiculata, R. stylosa, Ceriops tagal, Avicennia marina, A. alba, and Acanthus ilicifolius were collected from North Sumatran mangroves. Mangrove seedlings were grown for three months in 0.0%, 0.5%, 1.5%, 2.0% and 3.0% salinity concentration. The growth of mangrove seedlings emerged to show variation among the species. The growth of two salt secretor species of A. marina and A. alba were increased in the occurrence of salt with maximum activation at 2.0%. This escalation was reduced once salt concentration was increased above 2.0%. By contrast, two non-salt secretor species of R. apiculata and R. stylosa significantly expanded to 1.5% salinity, at that moment decreasing by accumulative salts. A salt secretor species of Ac showed the less salt tolerant of mangrove species. ilicifolius and a nonsalt-secretor of C. tagal, which their optimum growth was at 0.5% salinity. The tolerance of mangrove species to salt concentration tracked the sequence of Av. marina and Av. alba (most foreshore species) >R. stylosa and R. apiculata>C. tagal>Ac. ilicifolius (most landward species), which is following the natural species distribution and habitat zones.