The Environmental Factors Enhance the Growth and Survival of Rhizophora Seedlings

Mangrove forests are a community of tropical and subtropical beach vegetation, capable of growing and developing in tidal areas. This study aims to obtain information on the type and density of mangrove species by using remote sensing applications and to obtain mangrove distribution profile based on tidal. This research has been conducted in Bangkobangkoang Island Tupabbiring Sub-district of Pangkep Regency in September-October 2016. This research covers species inventory, mangrove density level using Landsat 8 image with Acquisition 6 June 2016 and mangrove distribution based on sea tides. The results showed that mangrove vegetation density conditions in Bangkobangkoang island were generally in good condition. The types of mangroves on the island of Bangkobangkoang are Rhizophora stylosa, Rhizophora apiculata, Rhizophora mucronata, Sonneratia alba , and Avicennia marina . The dominant mangrove species are Rhysophora stylosa and Rhizophora apiculata. Mangrove distributed at the highest tide with Rhyzophora stylosa type will be submerged while at lowest tide generally no mangrove is submerged except on the western island with the same type of Rhyzophora stylosa Key words: Mangrove, Landsat-8, Density, Ddistributions profile

Palynological evidences (pollen and spores) have been used to study mangrove diversity and vegetation fluctuation at coastal zone sites at Muktiharja, Kemijen Semarang , province of Central Java. Data was collected in April 2nd to April 17th 2006 following transect method, for sediments sampling used surface subsurface sampling method (depth in 25cm). Pollen preparation used Acetolysis method. The result showed that mangrove forest in the coastal zone of Muktiharja, Kemijen Semarang was dominated by Rhizophoarceae pollen type (included Rhizophora genus : Rhizophora mucronata, Rhizophora stylosa dan Rhizophora apiculata). Vegetation of mangrove forrest in this bay was fluctuated which terrestrial climate was influenced in this mangrove forrest.

Dissolved oxygen as a constraint for the structure of mangrove fish assemblages and their patterns of mangrove utilisation: a comparison between natural and disturbed mangrove ecosystems through the Australian and Caledonian coastlines

One of the coastal ecosystems that have experienced a high level of degradation due to its utilization pattern which tends not to pay attention to its sustainability aspects is the mangrove forest in Rangsang District, Meranti Islands Regency, and Riau, Indonesia. Seeing the symptoms of mangrove forest destruction for various purposes, it is necessary to manage mangrove forests sustainably. To be able to carry out sustainable management of mangrove forests, management efforts are needed ber of strategic value and right. Management of community-based marine resources is one management strategy that can improve efficiency and fairness in the utilization and management of natural resources. The research aims to identify and analyze the condition of mangrove forests, reviewing mangrove forest management, and the development of community-based mangrove forest in the district of stimuli. The approach used in this study is an analytical descriptive approach with survey methods. This research was conducted in Rangsang sub-district, Meranti Islands regency, Riau. The results showed that the mangrove vegetation found included 7 species from 3 families, namely Avicenniaceae (Avicennia alba and Avicennia marina), Rhizophoraceae (Rhizophora mucronata, Rhizophora apiculata, Rhizophora stylosa, and Bruguiera gymnorrhiza) families, and Sonneratiaceae family (Sonneratia alba) , with the value of diversity index (H ') of mangrove vegetation in Rangsang sub-district at each station ranged from 0.91 to 1.69 and the environmental parameters of mangrove vegetation in Rangsang sub-district were obtained from clay sand, sandy clay and sandy clay; Soil pH ranges from 6.6-7.1; temperatures range from 29-31˚C; salinity ranges from 27-31 ppt; and organic matter content between 1.09-7.65. At the very least, there are three factors of decision making on community participation in mangrove forest management, namely management factors, knowledge factors and attitude factors. Meanwhile, mangrove forest management carried out by the community in Rangsang District in the form of rehabilitation, care and supervision. Therefore, in an effort to manage community-based mangrove forests active community participation is required by taking into account management factors, knowledge factors and attitude factors.

Abstract. Arbiastutie Y, Diba F, Masriani. 2021. Short Communication: Ethnobotanical and ecological studies of medicinal plants in a mangrove forest in Mempawah District, West Kalimantan, Indonesia. Biodiversitas 22: 3164-3170. The mangrove forest Polaria Tanjung Pagar in Mendalok Village, Mempawah District, West Kalimantan, Indonesia, is a mangrove forest maintained by the local community. Currently, this mangrove forest has become one of the tourist attractions, not only visited by local and national, but also foreign tourists. This study aims to identify plants in Polaria Tanjung Pagar mangrove forest Kalimantan with the potential for medicinal uses. The research used a survey method in the mangrove forest by conducting an inventory of the medicinal plants found in the mangrove forest. Observations were made using a transect line with the total area understudy of 0.012 ha and sampling intensity of 0.4%. The investigation was based on cross-checking the traditional use of medicinal plants by the surrounding communities and the scientific literature. The results showed 13 types of medicinal plants (including tree and understorey plants) from 6 different families, i.e., Acrostichum aureum, Aegiceras corniculatum, Avicennia marina, Avicennia alba, Bruguiera parviflora, Bruguiera gymnorrhiza, Bruguiera cylindrica, Ceriops decandra, Rhizophora apiculata, Rhizophora stylosa, Rhizophora mucronata, Xylocarpus moluccensis, and Sonneratia caseolaris. The community structure of the mangrove forest had moderate diversity for tree species and low diversity for understorey plant species, with an H' valued at 2.39 and 0.25, respectively.

This study is intended to estimate the vulnerability of degradation of mangrove forest in Muara Village, Tangerang, Banten. There are five species of mangroves found in mangrove forest of Muara, which are: Avicennia alba , Avicennia officinnalis . Rhizophora apiculata , Rhizophora stylosa , and Rhizophora mucronata . The results showed that the mangrove forest in Muara has a high vulnerability of degradation based on the three vegetation characteristics, such as: density, domination, and biodiversity of mangrove species. The density of mangrove vegetation has only reached 739 individual/Ha. While the biodiversity of mangrove species is low and the domination level of mangrove species is high, in which the dominant species is Rhizophora mucronata . Mangrove rehabilitation activities are required by revegetation methods, and the mangrove species that are used in revegetation process are local species which available in the mangrove forest of Muara. Mangrove rehabilitation process that needs to be done is by revegetation of mangroves and mangrove species conservation. Mangrove species which is suitable for mangrove rehabilitation in Muara Village are Rhizophora mucronata and Avecinnea alba . Keywords: mangrove, forest, degradation, rehabilitation

Mangroves play an important role in coastal ecosystems, but their growth is often limited by nutrient availability, particularly nitrogen, phosphorus, and potassium (NPK) availability. The use of ammonium-based fertilizers can provide additional benefits by accelerating the growth of mangrove seedlings. This study examines the influence of various doses of ammonium-based NPK fertilizers on the growth of two mangrove species, Rhizophora mucronata and Rhizophora stylosa, The study was carried out in two different places with distinct environmental characteristics, Rhizophora mucronata was planted near land, whereas Rhizophora stylosa was planted in open areas near the sea. The seedlings received dosages of ammonium-based NPK fertilizer. Periodic measurements of growth characteristics, including leaf length, root length, plant height, and SPAD (Soil Plant Analysis Development) index, were conducted and tested statistically. Rhizophora mucronata responded effectively to ammonium-based fertilizer treatment, increasing plant height, root length, and chlorophyll content at an optimal dose of 0.9 grams per, although shoot growth decreased. These data show that Rhizophora mucronata is more responsive to ammonium- based fertilizer treatments than is Rhizophora stylosa under the evaluated environmental conditions, although the fertilizer dosage had no significant effect.

The existence and sustainability of mangrove forests have a significant role in the environment and communities around the coast. Mangrove ecosystems also have complex systems including plant and animal organisms that interact with one another and play an essential role in maintaining and protecting the coastline. This research was conducted to analyze the potential for the regeneration of mangrove seedlings in the coastal area of Dafi Village, Biak Numfor Regency. Data collection was carried out using the belt transect method. Analysis of species composition and structure of mangrove vegetation used analysis of species density, relative density, species frequency, relative frequency, and important value index. A total of seven mangrove species were found in the coastal area of Dafi Village, Biak Numfor Regency, consisting of Bruguiera gymnorrhiza, Bruguiera cylindrica, Ceriops tagal, Rhizophora apiculata, Rhizophora mucronata, Rhizophora stylosa, and Lumnitzera racemoza. Bruguiera gymnorrizha species had the highest density, frequency, and dominance values, while the lowest relative dominance and dominance were found in Lumnitzera racemoza. The highest IVI tree level values ​​were Ceriops tagal and Bruguiera gymnorrhiza. Mangrove forests in this area are still in natural condition, and the existence of mangrove ecosystems supports the lives of people around the island. Keywords: Coastal waters; Mangrove Ecosystem; Type Dominance; Important Value Value Index Abstrak Keberadaan dan kelestarian hutan mangrove mempunyai peran yang signifikan bagi lingkungan dan masyarakat yang tinggal di sekitar pesisir. Ekosistem mangrove juga memiliki sistem yang kompleks meliputi organisme tumbuhan dan hewan yang saling berinteraksi satu dengan yang lain, dan memegang peranan penting dalam menjaga dan melindungi garis pantai. Penelitian ini dilakukan dengan tujuan menganalisis struktur komunitas mangrove di Perairan Kampung Dafi Kabupaten Biak Numfor.Pengumpulan data ekosistem mangrove dilakukan dengan menggunakan metode belt transek. Analisis komposisi jenis dan struktur vegetasi mangrove menggunakan analisis kerapatan jenis, kerapatan relatif, frekuensi jenis, frekuensi relatif, dan indeks nilai penting. Total tujuh jenis mangrove ditemukan di Pesisir Kampung Dafi Kabupaten Biak Numfor yang terdiri atas jenis Bruguiera gymnorrhiza, Bruguiera cylindrica, Ceriops Tagal, Rhizophora apiculata, Rhizophora mucronata, Rhizophora Stylosa, dan Lumnitzera racemoza. Jenis Bruguiera gymnorrizha memiliki nilai kerapatan, Frekuensi dan dominansi tertinggi, sedangkan dominansi jenis dan dominansi relatif terendah pada mangrove jenis Lumnitzera racemoza. Nilai INP tingkat pohon yang paling tinggi adalah Ceriops tagal dan Bruguiera gymnorrhiza. Hutan mangrove pada kawasan ini masih berada dalam kondisi alami, dan keberadaan ekosistem mangrove menjadi penopang bagi kehidupan masyarakat di sekitar pulau. Kata kunci: Pesisir; Ekosistem Mangrove; Dominansi Jenis; Indeks Nilai Penting

Mangrove forest destruction is a serious problem that is currently occurring in almost all of Indonesia. To ensure the success of mangrove forest rehabilitation and as evaluation material, monitoring the condition of the rehabilitated mangrove ecosystem is very important. The methods used in measuring and observing mangrove vegetation are the path method and the grid line method. Transects were selected using the Purposive Sampling method after conducting an initial survey. The transect locations were chosen to reflect the overall condition of the mangrove forest in the study area. As a result of the research, 30 research plots were built, and 6 types of mangrove species from 3 families were obtained, namely Rhizophoraceae (Rhizophora stylosa, Rhizophora mucronata, Rhizophora apiculata, Bruguiera gymnorhiza), Combretaceae (Lumnitzera racemosa), and Meliaceae (Xylocarpus granatum). Rhizophora stylosa dominates with the highest IVI, namely (118.4), followed by Rhizophora mucronata (78.0) and Rhizophora Apiculata (55.1). This shows that Rhizophora stylosa has the strongest role in the tree community in the study area. At the seedling stage, the diversity index (H’) reached 0.4, indicating a relatively low level of diversity. At the sapling stage, the diversity index increased to 1.0585 and at the tree growth stage, the diversity index was 1.38, indicating a balanced level of diversity.

Hutan mangrove merupakan salah satu sumber daya alam yang mempunyai nilai dan arti yang sangat penting baik dari segi fisik, biologi maupun sosial ekonomi. Akibat meningkatnya kebutuhan hidup sebagian manusia telah mengintervensi ekosistem tersebut. Hal ini dapat terlihat dari adanya alih fungsi lahan mangrove menjadi tambak, permukiman, areal industri dan sebagainya.Salah satu kawasan hutan mangrove di Bali adalah Teluk Benoa. Tujujan penelitian ini yaitu untuk mengetahui struktur dan vegetasi dan jenis-jenis mangrove yang dominan di hutan mangrove Teluk Benoa-Bali. Metode yang digunakan dalam penelitian ini adalah sample survey method atau survey di lapangan. Pada setiap stasiun pengamatan sepanjang transek garis, dibuat petak (plot) dengan ukuran 10 meter x 10 meter sebanyak 3 plot untuk tiap stasiun. Selanjutnya pada setiap plot dilakukan pengamatan dan penghitungan jumlah individu mangrove per spesies yang ditemukan. Untuk keperluan analisis data, masing-masing individu pohon, anakan dan semai dicatat nama jenis dan keliling batang setinggi dada, sedangkan untuk vegetasi strata seedling dicatat nama jenis dan jumlah individu masing-masing jenis. Vegetasi mangrove yang ditemukan yaitu 11 spesies mangrove sejati dan 1 jenis mangrove ikutan yaitu Waru Laut (Thespesia popunema). Pada stasiun I, vegetasi mangrove tingkat pohon didominasi oleh Sonneratia alba (INP) sebesar 130.61, tingkat anakan didominasi oleh Rhizophora mucronata (INP) sebesar 246.11. Pada stasiun II, vegetasi mangrove tingkat pohon didominasi oleh Rhizophora mucronata (INP) sebesar 109.59, sedangkan tingkat anakan didominasi oleh Rhizophora stylosa (INP) sebesar 91.60. Pada stasiun III, vegetasi mangrove tingkat pohon didominasi oleh Rhizophora apiculata (INP) sebesar 92.26, sedangkan tingkat anakan didominasi oleh Rhizophora apiculata (INP) sebesar 82.89. Pada stasiun IV, vegetasi mangrove tingkat pohon didominasi oleh Sonneratia alba (INP) sebesar 93.77, sedangkan tingkat anakan didominasi oleh Avicennia marina (INP) sebesar 103.04. Pada stasiun V, vegetasi mangrove tingkat pohon didominasi oleh Bruguira gymnorrhyiza (INP) sebesar 115.31, sedangkan tingkat anakan didominasi oleh Rhizophora stylosa (INP) sebesar 136.62.

Mangrove forests are unique ecosystems that have ecological, biological and socio-economic functions. The function of mangrove forests on the environment is very important especially in the coastal and oceanic regions. Mangrove forests providers of wood, leaves as raw material for medicines, and natural dye. This study aims to inventory the diversity of species of mangrove vegetation in Mendalok Village, Sungai Kunyit Subdistrict, Mempawah Regency. The benefits of this study are to provide the data on mangrove forest vegetation as basic data for local government and related agencies in efforts to protect and preserve mangrove forests in Mendalok Village, Sungai Kunyit Subdistrict, Mempawah Regency. Inventory the tree in mangrove forest used a line with measured 200 meters. There are 6 lines and the distance between the lines as far as 100 meters. The lines of observation are placed by purposive sampling. The results of research found 11 types of species and consisted of 6 genera. The genera are Avicennia, Bruguiera, Ceriops, Rhizophora, Soneratia and Xylocarpus. The species found were Avicennia alba, Avicennia marina, Bruguiera cylindrica, Bruguiera gymnorrhiza, Bruguiera parviflora, Ceriops decandra, Rhizophora apiculata, Rhizophora mucronata, Rhizophora stylosa, Sonneratia caseolaris, Xylocarpus mollucensis. Diversity of mangrove species in Mendalok Village, Sungai Kunyit Subdistrict, Mempawah Regency was high and should be maintained for conservation and ecotourism area. Keywords : conservation, ecotourism, mangrove, Mendalok Village

Pohuwato Regency is famous for its green line of mangrove which presents as a wide coastal ecosystem extending from Paguat subdistrict to West Popayato subdistrict. Mangrove forests in coastal areas of Torosiaje are one of the essential areas which play an important role as a buffer zone of Tomini Gulf. Human activities that go beyond the carrying capacity of the environment have led to a rapid decline of mangrove diversity. This study aimed to analyze the diversity of tree-staged mangrove species in Torosiaje coastal area, Pohuwato Regency, Gorontalo Province. Diversity index was calculated using Shannon-Wiener formula. Based on the results, there were five tree-staged mangrove species, Xylocarpus granatum, Rhizophora mucronata, Ceriops tagal, Avicenniamarina, and Brugueira gymnorrhizawith the individual total of 80. The value of diversity index was 1.093 in station I, 0.61 in station II, and 0.62 in station III. These numbers showed that the area of station I had a moderate level of diversity with the diversity index value of H′ > 1,0 – 1.5 while the areas of station II and III had a low diversity with the diversity index value of H′< 1,0. The value of mangrove biomass in Torosiaje is 27 ton / ha. This amount is equivalent to 13.36 ton / ha C (carbon content) with the largest carbon stock in the Rhizophora mucronata species is 8.71 ton / ha C, while the lowest carbon content in Ceriops tagal species is 0.13 ton / ha C. Mangrove in Torosiaje can absorb as much 49.03 ton / ha of carbon dioxide. These findings can be used as provisional data to help the management of mangrove forest as an attempt to control and reduce the ongoing mangrove destruction in Pohuwato Regency. Keywords: Carbon Stock, Diversity, Mangrove species, Torosiaje

Mangrove forests are one of the most important coastal ecosystems as they support many local communities. However, over the last two decades harvesting of mangrove forests has been extensive with effects on mangrove biodiversity and ecosystem services. We investigate the effect of mangrove harvesting on tree biodiversity in South Sulawesi, Indonesia. Using two line transects each in ten mangrove forests, mangrove composition, species dominance, density, frequency, coverage, and stem diameter and diversity were recorded. Interviews detailing provisioning ecosystem services were also conducted with local forestry and fishery workers to determine the level of exploitation. Ten mangrove species were recorded (Avicennia alba, Bruguiera gymnorrhiza, Ceriops tagal, Excoecaria agallocha, Lumnitzera racemosa, Nypa fruticans, Rhizophora apiculata, Rhizophora mucronata, Rhizophora stylosa, and Sonneratia alba) belonging to six families (Avicenniaceae, Rhizophoraceae, Euphorbiaceae, Combretaceae, Arecaceae and Sonneratiaceae). Mangrove forests are now dominated by saplings and seedlings, with few trees above 15 cm diameter at breast height. Rhizophora sp. were found to be the most important and dominant species. Rhizophora sp. was the most widely used as it was deemed the most suitable for firewood and charcoal. In addition, it is the main species planted in mangrove restoration projects, which have focused on establishing production forest rather than restoring natural species composition and structure. Despite the decrease in biodiversity, the mangroves still provide a wide range of ecosystem services to the communities in the area.

Indonesian territory is dominated by Rhizophora mangrove vegetation, but in the Kolaka area, especially Induha Village, there is no information about this type of mangrove, so research is needed. The purpose of this study is to determine the vegetation Rhizophora mangroves sp. and fauna vertically in the mangrove forest in Induha Village. The method used is the Point Centered Sampling Method (PCQM). The results obtained, there are 3 types of mangrove Rhizophora namely Rhizophora apiculata, Rhizophora mucronata, and Rhizophora stylosa, with the highest relative density being Rhizophora apiculata at the seedling level (42.13%), sapling (57.50%) and at the tree level (38.31%). The highest relative frequency was Rhizophora apiculata at seedling (35%), sapling (45%) and tree (34.5%) levels. Rhizophora apiculata has the highest relative basal area value at the seedling (50%), sapling (84.83%) and tree (52.34%) levels. The highest relative canopy was Rhizophora apiculata, at the sapling (57.2%) and tree (35.3%). The highest Important Value Index was Rhizophora apiculata, at the seedling level (1 25.3 %), sapling (24 4.5 %) and tree (1 56.1 %). The fauna vertically identified as many as 5 types of species including hermit crabs, sea slugs, caterpillars, weaver ants and black ants. The conclusion of this study is that there are 3 types of mangroves identified in the mangrove forest dominated by Rhizophora apiculata and 5 fauna species. Environmental factors that have been observed support the survival of mangrove species in Induha Village, both in zone 1 and in zone 2, especially the Rhizophora apiculata.

Mangrove forest plant communities living in coastal areas have a significant influence on people’s lives ecologically and economically. As well as cultivating fisheries commodities and protecting coastal areas from abrasion and stroms, mangrove areas also play an important role in climat change issues. Due to their importance, some water and wetland areas with high conservation value are designated as Essential Ecosystem Areas. Lembar and Sekotong Bay is one of them. This study aims to observe the condition of plant structure and composition in essential areas as well as the environmental conditions that support plant growth. To do this, indices of density, relative density, frequency, relative frequency, dominance, and importance value index were taken from each mangrove species. This was done through vegetation analysis. The observation site consisted of six stations, each of which had 78 observation plot point. The results showed that there were seven mangrove species in the ecosystem area of importance: Rhizophora Apiculata, Rhizophora Stylosa, Rhizophora Mucronata, Bruguira Gymnorrhiza, Avicennia Marina, and Excoaria Agallocha. The highes species density and relative density were owned by Rhizophora Stylosa, and the lowest relative density was owned by Excoaria Agallocha. The Highest species frequency and relative frequency are own by Rhizophora Stylosa Overall, the condition of important mangrove area is still in the medium-dense category. Environmental factors such as temperature, saline, pH, and Humidity are very helpful for the growth of mangrove species.