scholarly journals Population and vegetation structure of ramin (Gonystylus bancanus) in secondary forests of Ketapang District, West Kalimantan, Indonesia

2018 ◽  
Vol 19 (2) ◽  
pp. 478-484
Author(s):  
ABDURRANI MUIN ◽  
DWI ASTIANI

Muin A, Astiani D. 2018. Population and vegetation structure of ramin (Gonystylus bancanus) in secondary forests of Ketapang District, West Kalimantan, Indonesia. Biodiversitas 19: 478-484. In the tropical peatland, ramin (Gonystylus bancanus Miq. Kurz) was one of many prominent species that present in peatland forest. The species distribution is mostly in Southeast Asia peatland. The beautiful wood color, pale yellow sometimes grayish with no differentiated sapwood and heartwood with straight interlocked grain, made it become the most wanted tree species from tropical peatland.The exploitation of Ramin wood since the 1970s caused the decrease of its population in the peatland forest, led to this species being listed as an endangered species. This study aimed to search information on the Ramin population and vegetation structure left in its habitat in secondary peatland forest of Pematang Gadung and Sungai Sirih villages area of Ketapang District. The study employed a survey method, and data collection was carried out using line plots system. Data assessed were natural regeneration condition-seedling, sapling and pole growth levels-, and tree growth levels. A 20 m x 20 m size plots were continually established to form a line with the length of 550-680 m. Results showed that relatively a few Ramin was found in the forests in Sungai Sirih with a mean seedling density of only 9.9 tree ha-1, height ranges of 131 cm to 150 cm, and counted sapling level of 183 trees ha-1 with diameter ranges from 0.38 to 6.37 cm. At Pematang Gadung village, more Ramin was found, especially with a bigger diameter. Tree level (diameter >20cm) was recorded at 74.1 tree ha-1 with a contradictory far less seedling (2.8 tree ha-1), sapling level (only 1 tree ha-1) and pole level (7.4 tree ha-1) established. Based on the tree population condition and the variation of their growth level, the vegetation structure of Ramin did not describe a normal curve form in the natural forest both in the villages of Pematang Gadung and Sungai Sirih.

2020 ◽  
Vol 8 (2) ◽  
pp. 230
Author(s):  
Nur Muhammad Heriyanto ◽  
Dolly Priatna ◽  
Ismayadi Samsoedin

Primary natural forests generally have higher biodiversity and biomass compared to secondary forests. This study aimed to analyze the species composition, forest structure, biomass and carbon stock in the Old Secondary Forest (HST), Young Secondary Forest (HSM), and Old Shrub Forest (HBT) in Peatland Protection Area, Musi Banyuasin Regency, South Sumatera Province. Forest inventory was conducted in measurement plots of 100 m x 100 m in the HST, HSM, and HBT. The results recorded 39 species of 20 families and 565 standing trees with a diameter of ≥ 10 in the HST, 48 species of 20 families and 430 standing trees in the HSM, and  2 species of 1 family and 4 standing trees in the HBT. Vegetation at the tree level in the HST was dominated by Eugenia sp., Alseodaphne insignis, and Adenanthera pavonina, while the HSM was dominated by Macaranga maingayi, Koompassia malaccensis, and Alseodaphne insignis, and the HBT was dominated by Acacia mangium and Acacia crassicarpa. The biomass and carbon stock of standing trees in the HST were 181,61 t/ha and 90,79 t C/ha, respectively; in the HSM were 117,04 t/ha and 58,51 t C/ha; while in the HBT were 1,33 t/ha and 0,66 t C/ha. The results revealed that carbon stock in the HST was higher than that in the HSM and HST.Keywords: carbon stocks, carbon uptake, Musi Banyuasin, peatlands, vegetation structure


2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Sapto Prayoga ◽  
Burhanuddin Burhanuddin ◽  
Evy Wardenaar

Mangrove Forest has a role for the life of fauna as a source of feed and shelter for honeybees. Honeybees need feed to maintain their survival in nature, so that the availability of the feed generated by flowers in the form of nectar and pollen gives the ability of bees to breed with maximum. This research aims to obtain the type of mangrove plants and pollen, and its potential in Surya Perdana Mandiri Mangrove Forest area. The research method used is a survey method with the example tile determination Purposive Sampling. There are 10 sample compartments of 20 x 20 meters in 2 research lines. Based on the results of the research is known that there are 22 types of mangrove plants, based on observations, 13 of which are the source of honey bee feed, and based on the study of literatures there are 18 The potential feed bees at the highest tree level on the Api-api putih (Avicemia Marina) with an INP value of 82.17% and the smallest value Ceriop decandra 17.50% while at the highest INP stake level of Rhizopora stylosa 76.08% with flowering 83.44% while the smallest INP Ceriop decandra 22.63% with flowering 36.36%. In the area of Mangrove Forest Setapuk Large types of honey bee feed plant available throughout the year, although in quantity varies from month to monthKeywords: bee feed, mangrove, potential, Setapuk Besar


2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Novita Putri Sesar ◽  
Iskandar A M ◽  
Togar Fernando Manurung

Natural orchids are one of the flora in Mount Poteng which is included of Raya Pasi Nature Reserve located at Singkawang City, West Kalimantan Province. Orchids have economic value for source of income and be beneficial to ecology that needs to be protected. The altitudes and environmental factors strongly affected the presence of orchid species.The research aims to record the diversity of natural orchids species based on the altitudes place in Mount Poteng. The research was conducted on February 28 until March 28, 2020. This research uses survey method. The research sample was taken using double plots method and to determine sample plots locations is conducted by purposive. The total number of the sample plots is 16 plots and each plot measure 20 by 50 meters. Based on the result of research found 19 species of natural orchids that consist of 348 individuals. The results analysis of the diversity index of orchid species in whole of altitudes at Mount Poteng is 1,338 that is included medium range. The highest species diversity index of 1,300 occurred at altitude of 400-500 m asl and the lowest species diversity index at altitude of 700-725 m asl that is 0,594. Orchid species which found in whole of altitudes is Dendrobium crumenatum. Furthermor, there were found the orchid species on certain heights are Cleisostoma scortechinii, Cordiglottis filiformis, Ludisia discolor, and Phalaenopsis pantherina at altitude of 400-500 m asl and species of Bromheadia finlaysoniana and Pomatocalpa latifolia found at altitude of 700-725 m asl.Keywords: altitudes, mount poteng, orchids, species diversity


2019 ◽  
Vol 12 (4) ◽  
pp. 611
Author(s):  
Alice Gerlane Cardoso da Silva ◽  
Diogo Henrique Helal

This study analyzes how the policies and practices of personnel management directed at individuals with disabilities in João Pessoa, PB, Brazil, are configured concerning their insertion and inclusion into the labor market. For such, a quantitative research of descriptive character was conducted using the survey method. The research was developed with individuals, with and without disabilities, who worked and resided in João Pessoa. In total, 90 individuals partook of the study, 45 of which presented disability while the other 45 presented none. The questionnaire was applied in person and made available on the internet by means of the Google Docs system. Data analysis was done using SPSS, consisting of a factorial and descriptive analyses, analysis of variance (ANOVA) and non-parametric tests Kruskal-Wallis and median. The results demonstrated that, despite the individuals with disabilities perceiving an evolution of personnel management policies and practices applied by the organizations regarding the manner of capturing, accepting and coexisting with individuals with disabilities, they are not yet enough to assure their effective inclusion in the labor market.


2017 ◽  
Vol 14 (2) ◽  
pp. 181
Author(s):  
Samuel Samuel ◽  
Siti Nurul Aida

Suatu riset yang bertujuan untuk mendapatkan data dan informasi tentang aktivitas penangkapan dan distribusi udang galah (Macrobrachium rosenbergii) di daerah aliaran Sungai Kapuas, Kalimantan Barat telah dilakukan dari bulan Juni sampai dengan Desember 2005. Riset dilaksanakan dengan metode survei dengan cara mendatangi lokasi-lokasi tempat ada aktivitas penangkapan udang galah (Macrobrachium rosenbergii). Frekuensi survei 2 kali pada musim kemarau dan 2 kali pada musim hujan. Wilayah perairan yang disurvei adalah daerah aliaran Sungai Kapuas dalam Kabupaten Pontianak, Kota Pontianak, Kabupaten Sanggau, dan Kabupaten Sintang. Data dianalisis dengan metode deskriptif dan tabulasi. Dari survei ditemukan 9 jenis alat tangkap yang digunakan nelayan untuk menangkap udang galah (Macrobrachium rosenbergii) yaitu pancing, rawai, bubu, jala, jaring, blad, rompong, stroom, dan pukat rantau. Catch per unit of effort terkecil terjadi pada alat tangkap bubu yaitu 1,39 g per per unit per jam, terbesar adalah jala yaitu 416,67 g per unit jala per jam. Intensitas penangkapan terlihat dominan di perairan bagian hilir mencakup wilayah Kabupaten dan Kota Pontianak. Distribusi ukuran bobot individu udang galah (Macrobrachium rosenbergii) yang banyak tertangkap oleh nelayan (nilai modus) dari 4 kali survei bervariasi antara 17,73 sampai dengan 40,00 g (Kabupaten Pontianak); 19,31 sampai dengan 47,01 g (Kota Pontianak), 17,79 sampai dengan 45, 35 g (Kabupaten Sanggau), dan antara 25,08 sampai dengan 85,52 g (Kabupaten Sintang). Kualitas air pada habitat tempat udang tertangkap di daerah aliaran Sungai Kapuas dalam batas-batas yang layak untuk mendukung kehidupan ikan dan udang. A study aimed to obtain recent data and information about capture activities and distribution of giant freshwater (Macrobrachiumrosenbergii) prawn in Kapuas River,West Kalimantan was conducted from June to December 2005. Survey method was used in each research stations that are Pontianak district, Pontianak City, Sanggau, and Sintang districts. The stations were selected based on fishing activities and habitat condition. Field survey was completed by conducting 4 times surveys including dry and rainy seasons. Data collected were analyzed by using tabulation and descriptive method. The results showed that there were 9 types of fishing gears commonly used to catch giant freshwater (Macrobrachium rosenbergii) prawn. These fishing gears were : hook and line, long line, pot traps, cast net, gill net, barrier traps, surrounding net, electrical fishing, and surrounding net. Catch per unit effort of the cast net was the highest (416,67 gr per unit per hour, whereas, pot trap was the lowest (1,39 g per unit per hour). Water quality in each stations indicated suitable for aquatic organisms. The capture intensity showed that in downstream(Pontianak District and Pontianak City) was more dominant than in upstream (Sanggau and Sintang Districts). Distribution of weight based on modus indicated variation in each stations, which are 17.73 to 40.00 g (Pontianak District), 19.31 to 47.01 g (Pontianak District), 17.79 to 45.35 g (Sanggau District),and 25.08 to 85.52 g (Sintang District).


2019 ◽  
Vol 19 (1) ◽  
pp. 1
Author(s):  
Yuri E.M. Diang ◽  
Rooije R.H. Rumende ◽  
Hanny H. Pontororing

 KEPADATAN POPULASI KUPU-KUPU Troides helena  L. DI AIR TERJUN TUNAN DESA TALAWAAN, MINAHASA UTARA DAN TAMANHUTANRAYAGUNUNG TUMPA, MANADOABSTRAKKepadatan populasi menunjukan besarnya populasi dalam satuan ruang.Umumnya dinyatakan sebagai jumlah individu atau biomasa persatuan luas atau volume.  Penelitian ini bertujuan untuk menganalisis kepadatan populasi kupu-kupu  Troides helena. Penelitian ini menggunakan metode survey berupa transek garis  Penelitian ini dilakukan di dua  tempat  di Air Terjun Tunan Desa Talawaan Minahasa Utara dan Taman Hutan Raya Gunung Tumpa Manado. penelitian ini hanya dilakukan pada hutan sekunder yang sebagian besar lahannya telah dijadikan lahan pertanian. Kepadatan populasi tertinggi di daerah Air Terjun Tunan Desa Talawaan Minahasa Utara  terdapat pada Transek 2 (8 ekor/km2). Kepadatan populasi terendah terdapat pada Transek 3 (3 ekor/km2).Pada daerah Taman Hutan Raya Gunung Tumpa Manado kepadatan populasi tertinggi terdapat pada Transek 2 (74 ekor/km2).Kepadatan populasi terendah terdapat Transek 3 (14 ekor/km2).Kata kunci :Kepadatan Populasi, Troides helena, Air Terjun Tunan, TAHURA Gunung Tumpa, Sulawesi Utara POPULATION DENSITY OFTroides helenaL. ON TUNAN WATERFALL IN TALAWAAN VILLAGE, NORTH MINAHASA AND FOREST PARK OF MOUNT TUMPA, MANADO. ABSTRACTPopulation density shows the size of the population in units of space. Generally expressed as the number of individuals or biomass in area or volume. This research aims to analyze the population density of Troides helena on Tunan Waterfall in Talawaan Village, North Minahasa and Forest Park of Mount Tumpa, manado. This study used a survey method in the form of the transect line.This research only in secondary forests  is done on most of its land was made of agricultural land. The highest population density in the area Waterfall North Minahasa Talawaan Village Tunan found on Transect 2 (8 tails/km2). The low population density found in Transect 3 (3 tail/km2). In the area Forest Park of Mount Tumpa, manado.  Highest population density is found in the Transect 2 (74 tail/km2). The low population density there are Transect 3 (14 tail/km2).Keywords :Population Density, Troides helena, Tunan Waterfall, Forest Park of Mount Tumpa, North Sulawesi


2012 ◽  
Vol 40 (3) ◽  
pp. 211-221 ◽  
Author(s):  
BRADLEY B. WALTERS ◽  
LISA HANSEN

SUMMARYIslands of the West Indies are among the most historically impacted by agriculture, yet agricultural influences on forests there have been little studied. This research compared tree species richness and vegetation structure between farmed lands, post-agriculture secondary forests and mature remnant forests in two watersheds in Saint Lucia, and sought to understand the current distribution of these habitats in terms of land use and watershed topography. Farms devoted to annual crops had few trees and much exposed soil. By contrast, agroforests had abundant (mostly planted) trees and vegetation structure comparable to secondary forests. Secondary forests had highest overall species richness, but mature forests had the most developed vegetation structure. Variations in habitat distribution reflected different land use histories, with the more rugged west coast long dominated by tree crop farming and the east coast experiencing a recent boom-bust cycle in bananas. Mature and secondary forests were more likely found at higher altitude, further from roads and at sites more difficult to access, the combined result of government protection of key forest and watershed reserves and farmers’ preferential abandonment of marginal lands. For conservationists, this return of forests is reason for optimism and it presents strategic opportunities for public land acquisition or collaborative management to further forest and watershed protection objectives.


2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Adi Suyatno, Masyhuri, Jangkung Handoyo Mulyo, Irham

This research was conducted in the District of Mempawah, which is in the region of West Kalimantan and borders with neighboring countries (Malaysia), which of course has special characteristics, especially from the aspect of international trade, so that the comparative advantage of paddy associated with aspects of international trade, need to be examined. This study used a survey method, with 183 sample, where the number of samples of each pattern of agro-ecosystem isirrigation pattern has 55 samples, tidal patterns has 42 samples, rainfedpatterns has46samples and dry land patterns has 40 samples. The method of analysis in this study used the concept of DRC (Domestic Resource Cost). The results showed comparative advantage as indicated by the average value of the DRC is Rp 2,429, - This value indicates that the cost of domestic resources for the value to produce rice, can save foreign exchange worth US $ 1. DRCR average of 0, 24 which means rice farming has a comparative advantage (<1). Irrigation schemes have the highest levels of comparative advantage and the dry land pattern has the lowest level of comparative advantage. DRCR shows that rice is still cheaper economically to be produced in the country compared with imports from other countries. The implications of this conclusion is that the spur policy (increase) in rice production in the District of Mempawah still favorable compared to the expense of foreign exchange to import the commodity from other countries. Keywords: comparative advantage, Pattern Agroecosystems, Domestic Resource Cost


Author(s):  
WAHYU ISRONI ◽  
R ADHARYAN ISLAMY ◽  
MOHAMAD MUSA ◽  
PUTUT WIJANARKO

Abstract. Isroni W, Islamy RA, Musa M, Wijanarko P. 2019. Short Communication: Species composition and density of mangrove forest in Kedawang Village, Pasuruan, East Java. Biodiversitas 20: 1688-1692. Mangrove is one of ecosystems located in estuary and shallow coastal waters and its existence has a significant role for life. The aim of this study was to identify species composition and density of mangrove forest in Kedawang village, Nguling Sub-district, Pasuruan District, East Java, Indonesia. Survey method using belt transects was carried at three sampling points. Results of this study showed that mangrove vegetation in Kedawang includes five species from three families, namely Avicenniaceae (Avicennia alba and Avicennia marina), Rhizophoraceae (Rhizophora apiculata and Rhizophora mucronata), and Sonneratiace (Sonneratia alba). At sampling point 1, A. alba dominated with a density of 37 individuals/ha at tree level, 380 individuals/ha at pole level and 3100 individuals/ha at stake level. At sampling point 2, the tree level was dominated by A. alba with 142 individuals/ha, while R. mucronata dominated the pole and stake level with 1300 and 1467individuals/ha, respectively. At sampling point 3, the pole and stake level was dominated by A. alba with 167 and 933 individuals/ha respectively, while A. marina dominated the sapling level with 800 individuals/ha. At all stations, the density at stake level is greater than that tree level. Therefore, it is necessary to carry out conservation efforts in the form of protection combined with restoration by enrichment planting at all study locations to increase the diversity and density of mangrove vegetation.


2021 ◽  
Vol 9 (2) ◽  
pp. 173
Author(s):  
Rachmad Rachmad ◽  
Hari Prayogo ◽  
M Sofwan Anwari

This research is motivated by the high cases of illegal trade of protected wildlife in West Kalimantan Province. Animal trade tends to be endangered and included in the endangered list. Actions of animal trade that still occur in West Kalimantan Province indicate the low level of law enforcement and weak supervision by related parties in combating cases of protected animal trade. The purpose of this study is to examine the factors causing the occurrence of illegal trade crimes against protected animals in the West Kalimantan region, and analyze the performance of stakeholders in law enforcement against the illegal trade of protected animals in the West Kalimantan region based on their role and authority. This study uses a survey method that is guided by a questionnaire. The selection of respondents by purposive sampling, data analysis using policy analysis then the data is descriptive with tabulation. The results of the study show that in the period of 2016-2019 there were 49 cases of illegal wildlife trade in West Kalimantan Province, the traded animals are species belonging to protected animals and classified in the Appendix I. category. The dominant protected species traded in the 2016-2019 period originated from anteater species (Manis javanica), Orang-utan (Pongo pygmaeus), and Turtle (Chelonia sp.). The dominant factor in the illegal trade of protected animals in the province of West Kalimantan in the 2016-2019 period was economic factors, followed by motives for the collection of rare goods and consumption. The performance of stakeholders in law enforcement against protected animals in the West Kalimantan region has succeeded in handling criminal cases against protected animals, all of which ended with the execution of the defendant.Keywords: law enforcement performance, protected animals, illegal trading, stakeholders.AbstrakPenelitian ini dilatarbelakangi tingginya kasus perdagangan illegal satwa dilindungi di Provinsi Kalimantan Barat. Perdagangan satwa yang dilakukan cenderung pada spesies-spesies langka dan termasuk dalam daftar terancam punah. Aksi perdagangan satwa yang masih terjadi di Provinsi Kalimantan Barat mengindikasikan masih rendahnya penegakan hukum dan lemahnya pengawasan oleh pihak terkait dalam memberantas kasus perdagangan satwa yang dilindungi. Tujuan penelitian ini untuk mengkaji faktor penyebab terjadinya kejahatan perdagangan illegal terhadap satwa yang dilindungi, serta menganalisis kinerja pemangku kepentingan dalam penegakan hukum terhadap perdagangan illegal satwa yang dilindungi di wilayah Kalimantan Barat berdasarkan peran dan kewenangan. Penelitian ini menggunakan metode survey yang dipandu dengan kuesioner. Pemilihan responden dengan purposive sampling, analisis data menggunakan analisis kebijakan kemudian data dideskriptif dengan tabulasi. Hasil penelitian menunjukan kurun waktu 2016-2019 terdapat 49 kasus perdagangan satwa illegal di Provinsi Kalimantan Barat, satwa yang diperdagangkan merupakan jenis satwa yang termasuk ke dalam satwa dilindungi dan tergolong dalam kateogri Appindiks I. Satwa dilindungi dominan yang diperdagangkan pada periode 2016-2019 berasal dari spesies trenggiling (Manis javanica), Orang utan (Pongo pygmeus), dan Penyu (Chelonia sp.). Faktor dominan perdagangan illegal satwa dilindungi di Provinsi Kalimantan Barat dalam periode 2016-2019 adalah faktor ekonomi kemudian diikuti motif koleksi barang langka dan konsumsi. Kinerja pemangku kepentingan dalam penegakan hukum terhadap satwa yang dilindungi di wilayah Kalimantan Barat, telah berhasil menangani kasus pidana terhadap satwa dilindungi yang kesemuanya berahir dengan eksekusi kepada terdakwa.Kata kunci: kinerja penegakan hukum, perdagangan illegal, satwa dilindungi, pemangku kepentingan.


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