KEANEKARAGAMAN TUMBUHAN MANGROVE DI DESA ALUR DUA TAHUN 2019

Hutan mangrove adalah hutan yang dapat tumbuh di daerah pesisir pantai atau hutan yang dekat dengan muara sungai. Hutan ini merupakan hutan yang dipengaruhi oleh keberadaan pasang surut air laut. Tumbuhan ini dapat dijumpai di wilayah tropis dan subtropis yang terlindungi dari hamparan ombak. Tujuan penelitian ini ialah Untuk mengetahui Keanekaragaman Tumbuhan Mangrove di Desa Alur Dua dan mengetahui jenis tumbuhan mangrove manakah yang paling dominan. Metode yang digunakan dalam penelitian ini adalah metode jalur berpetak,teknik pengambilan sampel menggunakan jalur berpetak dengan ukuran 10 m x 10 m. Hasil penelitian yang telah dilakukan ditemukan indeks keanekaragaman tumbuhan mangrove sebesarH’= 2,1005 tergolong sedang.Ditemukan 6 mangrove sejati dan 4 mangrove ikutan. Spesies yang paling dominan adalah Aegialitis annulata dengan nilai indeks keanekaragaman 0,3621 sedangkan spesies yang terendah adalah Hibicus teleacius dengan indeks keanekaragaman 0,1677. Disarankan kepada masyarakat agar menjaga lingkungan khususnya didaerah pesisir agar habitat tumbuhan mangrove tetap terjaga.

Potential Regeneration of Mangrove Coastal of Payum Beach Merauke District

The purpose of this study was to analyze the regeneration potential of mangroves found on the coast of Payum, Merauke Regency, Papua Province. This research was conducted in August-October 2018. The data collection technique was purposive sampling using Transect Line Plots. The sampling location was chosen based on the representation of the presence of mangroves in three locations, namely zones A, B and C. The results of this study explained that there were three tree-level mangrove species, namely Avicennia alba, Rhizophora apiculata and Sonneratia alba. Type A. alba dominates in zone A with an important value index (INP) of 205.76%, zone B does not have a certain type that dominates, while Rhizophora apiculata dominates in zone C with INP 185.35%. The potential of the three mangrove species in zones A, B and C is good. Aegialitis annulata species are only found in sapling and seedling levels. In zones A and B are classified as new while in zone C is classified as bad. This study concluded that Avicennia alba, Rhizophora apiculata and Sonneratia alba had the potential to regenerate in all three locations (Zones A, B and C) compared to Aegialitis annulata.

Salt Regulation in the Mangroves Rhizophora Mucronata Lam. And Aegialitis Annulata Rbr

The mangrove Rhizophora mucronata grows in an intertidal region and exchfdes salt from its xylem (17 m�equiv. chloride per litre of sap) more efficiently than does the salt� secreting mangrove AegialitiB annulata (85-122 m�equiv. chloride per litre of sap). From the transpiration stream each leaf of Rhizophora receives about 17 p.�equiv. chloride each day, but the chloride concentration of the growing leaf remains approximately constant (510-560 m�equiv. chloride per litre of sap water). In Aegialiti8 input of chloride to a mature leaf is about 100 p..equiv. per day and this input is balanced by secretion (mainly of sodium chloride) from the salt glands. Secretion collected under oil contains chloride, 450 p.-equiv/ml, sodium, 355 p.-equiv/ ml, and potassium, 27 p.-equiv/ml. Secretion rates from leaves on the tree, based on leaf area, vary from 93 p-equiv. cm-2 sec-1 during the day to 3 p-equiv. cm-2 sec-1 in darkness; the secretion in light, based on an effective gland area, is about 25,000 p-equiv. cm-2 sec-I. The water potential of the secretion is close to that in the leaf suggesting that secretion involves active transport of salt and passive movement of water by local osmosis.