Identification of highland peat vegetation in the Sub-district of Lintong Nihuta, Humbang Hasundutan Regency, North Sumatera, Indonesia

Abstract This study aims to identify the structure, composition, and current status of highland peat vegetation in the Lintong Nihuta Sub-district, Humbang Hasundutan Regency, North Sumatra Province. The research conducted from December 2020 to April 2021. This study uses a survey method. The plots were laid using the purposive sampling method considering that the observed plots were those with naturally growing vegetation and accessible terrain. Sampling used the double plot vegetation analysis method with a plot size of 4 x 4 m for seedlings and 20 x 20 m for saplings obtained by measuring the minimum area of the plot. The data obtained were analyzed for frequency calculations, important value index (IVI), and Shannon-Weiner diversity index (H’). The results of the vegetation analysis showed that from the four existing growth classes, only two growth classes were found at the research site, namely seedlings and saplings with a total of 23 species. The vegetation composition is dominated by shrub habitus which indicates that this peatland has been degraded. The dominant species in the study site were Lepinoria mucronata Rich. and Dicranopteris linearis (Burm.) F. Underw. The value of the biodiversity index (H’) is 0.8 with a low criterion which means the vegetation ecosystem at the study site is unstable

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Vegetation analysis and plant diversity in Pinus Jantho Forest (PJF) nature reserve, Aceh Besar

Jurnal Natural ◽

10.24815/jn.v21i1.18417 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

HILMINA ITAWAMERNI ◽

SAIDA RASNOVI ◽

ZUMAIDAR ZUMAIDAR

Keyword(s):

Species Diversity ◽

Plant Species ◽

Nature Reserve ◽

Diversity Index ◽

Systematic Sampling ◽

Vegetation Analysis ◽

High Level ◽

Piper Aduncum ◽

Important Value Index ◽

Pinus Merkusii

Pinus Jantho Forest (PJF) Nature Reserve has unique characteristics and distinctive ecosystem that plays an important role in the preservation of germplasm and the protection of natural resources. The sustainability of the PJF Nature Reserve is strongly determined by vegetation of its constituents. Therefore, an effort is needed to help its management properly, one of which is by knowing the diversity of plants that make up the community in PJF Nature Reserve. The purpose of this research is to analyze the composition and diversity of plant species in PJF Nature Reserve. Data collection and sampling were done using multiple square method. The plots were laid out by systematic sampling. PJF Nature Reserve composed of 111 species from 46 family. The seedling and understorey have the highest number individuals (1028 in total). Then there are 240 individuals at sapling level, 108 individuals at pole, and 72 individuals for tree. The Euphorbiaceae family has the largest number of species (11 species). The highest Important Value Index (IVI) for seedlings and understorey, sapling and pole, and tree respectively were Chloranthus elatior (11.09%), Piper aduncum (21.90% and 19.32%), and Pinus merkusii (25.52%). The Diversity Index indicates a high level of plant species diversity (3.25-3.63).

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Analysis of Gastropod Diversity as a Bioindicator of Waters in Situ Ciburuy Padalarang, West Bandung Regency, West Java, Indonesia

Asian Journal of Fisheries and Aquatic Research ◽

10.9734/ajfar/2021/v15i530341 ◽

2021 ◽

pp. 10-19

Author(s):

Erwin Theofilius ◽

Zahidah Hasan ◽

Asep Agus Handaka ◽

Herman Hamndani

Keyword(s):

Water Quality ◽

Species Diversity ◽

Sampling Method ◽

Diversity Index ◽

Research Area ◽

Survey Method ◽

Gastropod Species ◽

Evenness Index

This study conducted to determine the water quality of Situ Ciburuy based on the structure of the gastropod community as a bioindicator. The survey method used in this study based on collecting data directly at the research area (purpose sampling method). For instance, species and density of gastropods were descriptively analyzed, using diversity index and evenes index. For instance, The findings showed that level of water quality in Situ Ciburuy based on gastropods bioindicators was lightly polluted. That is indicated by the low to moderate diversity of gastropods, which ranges from 1.31-1.98. The Shannon evenness index (0,73-0.95) revealed low gastropod species diversity in Situ Ciburuy, indicating low evenness of gastropod in Situ Ciburuy.

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ANALISIS KUALITAS PERAIRAN BERDASARKAN KOMPOSISI DAN KELIMPAHAN FITOPLANKTON DI SUNGAI LANANGAN, KLATEN

Management of Aquatic Resources Journal (MAQUARES) ◽

10.14710/marj.v7i3.22549 ◽

2018 ◽

Vol 7 (3) ◽

pp. 253-262

Author(s):

Faudzi Ath Tho Azzam ◽

Niniek Widyorini ◽

Bambang Sulardiono

Keyword(s):

Sampling Method ◽

Phytoplankton Community ◽

Diversity Index ◽

Animal Husbandry ◽

Open Water ◽

Survey Method ◽

Purposive Sampling ◽

Freshwater Aquaculture ◽

Range Of Values

Sungai Lanangan merupakan bagian hulu Sungai Bengawan Solo yang terletak di Desa Daleman, Kecamatan Tulung, Kabupaten Klaten. Jenis limbah seperti limbah domestik, industri, pertanian, perikanan dan peternakan telah mencemari Sungai Lanangan. Limbah organik dari industri tepung aren dan mie soun yang dibuang di Sungai Lanangan mencapai 50 ton limbah per hari. Hal tersebut menyebabkan perubahan kualitas air dan komposisi fitoplankton di Sungai Lanangan.Penelitian ini dilakukan dari bulan Januari - Februari 2018 di Sungai Lanangan. Tujuan dari penelitian ini adalah untuk mengetahui kelimpahan dan komposisifitoplankton serta mengetahui kualitas perairan berdasarkan struktur komunitas fitoplankton di Sungai Lanangan tersebut. Penelitian ini menggunakan metode survei denganpengambilan sampel menggunakan metode purposive sampling. Frekuensi pengambilan sampel dilakukan setiap 1 minggu sekali selama 3 minggu. Sampel diambil dari 3 stasiun, dimana stasiun 1 dengan karakteristik perairan terbuka; Stasiun 2 dengan karakteristik dekat industri pengolahan tepung aren; dan stasiun 3 dengan karakteristik dekat dengan daerah budidaya air tawar.Hasil penelitian didapatkan 11 genera fitoplankton yaitu dari kelas Bacillariophyceae (4 genera), Cyanophyceae (2 genera), Chrysophyceae (1 genus), Ulvophyceae (2 genera), Zygnematophyceae (1 genus) dan Chlorophyceae (1 genus). Kelimpahan rata-rata fitoplankton tertinggi terdapat pada stasiun 2 dengan kelimpahan 1.989 ind/l yang didominasi oleh genus Oscillatoria. Indeks keanekaragaman rata-rata pada setiap stasiun adalah 1,68 pada stasiun 1; 1,63 pada stasiun 2; dan 1,52 pada stasiun 3. Dari hasil indeks keanekaragaman yang didapatkan tersebut menunjukkan kisaran nilai antara 1,52 hingga 1,68 yang berarti bahwa kualitas perairan Sungai Lanangan tercemar ringan. Lanangan river is one upstream of Bengawan Solo river which located at Daleman, Tulung, Klaten. types of waste such as domestic waste, industrial waste, agriculture, fishery and animal husbandry polluted Lanangan river. Especially organic waste from palm starch and soun noodle industry that are dumped in the Lanangan river reaches 50 tonnes waste per day. This research was conducted from January to February 2018 in the Lanangan river. The purpose of this research is to find out the abundance and composition of phytoplankton; and to determine the water qualitybased on the structure of the phytoplankton community in Lanangan river. This research uses survey method and use purposive sampling method. The Frequency of sampling is done once a week for 3 week. The samples taken from 3 stations, where station 1 is open water; Station 2 is near palm starch and soun noodle industry; and station 3 is close to freshwater aquaculture area.The resultsof the research found 11 genus of phytoplankton in class Bacillariophyceae, Cyanophyceae, Chrysophyceae, Ulvophyceae, Zygnematophyceae and Chlorophyceae. The highest average of phytoplankton abundance found in station 2 with 1,989 ind/l which is dominated by the genus of Oscillatoria. The average diversity index each station is 1.68 at station 1; 1.63 at station 2; and 1.52 at station 3. From the results obtained the diversity index indicates the range of values between 1.52 to 1.68 which show that the water quality of Lanangan River is lightly to moderate polluted.

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Komposisi, Struktur, Dan Keanekaragaman Jenis Vegetasi Di Jalur Wisata Air Terjun Wiyono Atas Taman Hutan Raya Wan Abdul Rachman Provinsi Lampung

Jurnal Sylva Lestari ◽

10.23960/jsl3483-96 ◽

2016 ◽

Vol 4 (3) ◽

pp. 83

Author(s):

Ardiyansa Dwi Saputra ◽

Indriyanto Indriyanto ◽

Duryat Duryat

Keyword(s):

Sampling Method ◽

Diversity Index ◽

Species Structure ◽

Low Density ◽

Vegetation Density ◽

Plant Composition ◽

Forest Park ◽

Tourism Potential ◽

The Right ◽

Important Value Index

Wan Abdul Rachman Grand Forest Park has a potential of natural resources that can be used as natural attractions. One of the tourism potential is The Waterfall of Wiyono Atas. In addition, plant diversity found around the waterfall also has a potential to support the tourism. The aims of the research was to figure out the composition of plant species, structure of vegetation based on the density of each growth phase, and diversity of plant along the tourism track. The research was conducted in May—June 2015. Vegetation analysis with aterraced plot was employed as sampling method, that was consisting 44 plots which were 22 plots for left track and 22 plots for right track, and the distance between plots was 80 m. The analysis of density, frequency, dominance, important value index, Shannon diversity index, and canopy stratification were used as data analysis. The results showed that the plant composition along the tourism track was made up of 28 species in the left track and 31 species in the right track. The vegetation density of tourism track was classified as high on seedling phase for 11,600 individu/ha, sapling phase 1,880 individu/ha, and it was classified low density on pole phase for 350 individu/ha, and tree phase for 63.64 individu/ha on the left track, while on the right track, vegetatation density was classified as high on seedling phase for 10,900 individu/ha, sapling phase for 1,140 individu/ha, and classified low density on pole phase for 309.09 individu/ha, and tree phase for 86.36 individu/ha. The vegetation former, consist of 5 stratum, ranging from stratum A, B, C, D, and E. The diversity in the tourism track was classified as low, with the value of diversity in the left track of 1.197 and the right track of 1.189. Keywords: composition, diversity, Grand Forest Park, structures

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PENGARUH STRES KERJA TERHADAP KOMITMEN ORGANISASI PADA PT. PELABUHAN INDONESIA I (PERSERO) MEDAN

Jurnal Bisnis Dan Kajian Strategi Manajemen ◽

10.35308/jbkan.v2i1.885 ◽

2018 ◽

Vol 2 (1) ◽

Author(s):

Damrus Damrus ◽

Ronal Donra Sihaloho

Keyword(s):

Organizational Commitment ◽

Work Stress ◽

Sampling Method ◽

Human Resources Management ◽

Linear Regression Analysis ◽

Sampling Technique ◽

Multiple Linear Regression Analysis ◽

Survey Method ◽

Analysis Method ◽

Spss Software

Abstract : Organizational commitment is one of the important thing to be considered by the company to observe the extent to which employees are responsible toward their responsibility merupakan suatu hal yang penting untuk diperhatikan suatu perusahaan untuk melihat sejauh mana karyawan tersebut lebih bertanggungjawab terhadap kewajibannya. PT. Pelabuhan Indonesia I (Persero) Medan engage in port services which has good performance. However, on March-August 2015 the employees performance of PT. Pelabuhan Indonesia I (Persero) Medan showed declining trend. This declining in performance are assumed to be influenced by several factors such as work stress and organizational commitment. This study aims to analyse the influence of work stress toward organizational commitment at PT. Pelabuhan Indonesia I (Persero) Medan. The problem identification of this study is how to increase the organizational commitment by considering work stress inside the company. The theory used in this study is human resources management related to work stress and organizational commitment. The method used in this study is survey method, this is descriptive quantitative study ant the nature of this study is explanatory research. The number of samples used in this study are 72 people. The samples are drawn by using non probability sampling technique with purposive sampling method. Data analysis method used is simple multiple linear regression analysis using SPSS software. The result shows that partially wotk stress conflict has negative and significant influence toward organizational commitment. Key words: Stres kerja dan Komitmen organisasi

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Kajian Tumbuhan Obat Akar Kuning (Arcangelisia flava Merr.) di Kelompok Hutan Gelawan, Kabupaten Kampar, Riau

Buletin Plasma Nutfah ◽

10.21082/blpn.v15n1.2009.p43-48 ◽

2016 ◽

Vol 15 (1) ◽

pp. 43 ◽

Cited By ~ 1

Author(s):

Endro Subiandono ◽

N. M. Heriyanto

Keyword(s):

Tree Species ◽

Diversity Index ◽

Average Diameter ◽

Tree Density ◽

Line Transect ◽

Vegetation Analysis ◽

Association Index ◽

Important Value Index

The study of akar kuning species (Arcangelisia flava Merr.) in Gelawan Forest Complex, Kampar District, Riau, was conducted in April 2005. This research used square plot measuring 1 km x 1 km (100 ha), in square plot made 5 systematicly line transect covering an area 1,000 m length and 20 m width distance between line transect 200 m. Each square plot was divided into sub plot to measure seedling, sampling, pole, and tree. Replications used two sample plots. The result of vegetation analysis, wide plot of 20 ha, with diversity index of tree, pole, sampling and seedling in habitat A. flava is 2.98, 3.57, 2.86, and 3.10. Each nineteen species included 28 individual crept by 33 individu of A. flava or density 1.65 individu/ha. Moreover, the density of A. flava with the average diameter and length was 4.84 cm and 17.18 m. Tree density that have diameter bigger than 20 was 98.65 individual per hectare. The species that closely associated with A. flava was Palaquium hexandrum Engl., Dyera costulata Hook.f., Dipterocarpus costulasus V.Sl. and Campnosperma auriculata Hook.f., in which association index was about 0.43, 0.31, 0.21, and 0.21. Domination of tree species with important value index/IVI above 15% at this habitat was: D. costulasus, Shorea parvifolia Dyer, P. hexandrum, C. auriculata and D. costulata. AbstrakKajian tumbuhan obat akar kuning (Arcangelisia flava Merr.) di kelompok hutan Gelawan, Kabupaten Kampar, Riau, dilakukan pada bulan April 2005. Penelitian ini menggunakan satuan contoh berbentuk bujur sangkar dengan ukuran 1 km x 1 km (100 ha). Di dalam plot bujur sangkar dibuat 5 jalur ukur yang diletakkan secara sistematik dengan jarak antarjalur 200 m, lebar jalur 20 m panjang 1.000 m dan pada jalur ini dilakukan pengukuran semai, pancang, tiang, dan pohon. Jumlah satuan contoh dua buah plot. Hasil analisis vegetasi pada luas plot 20 ha, nilai indeks keanekaragaman jenis tingkat pohon, tiang, pancang, dan semai di habitat akar kuning masing-masing adalah 2,98; 3,57; 2,86; dan 3,10. Ditemukan 19 jenis pohon berjumlah 28 individu yang dirambati oleh 33 batang akar kuning atau kepadatan 1,65 individu/ha berdiameter dan panjang rata-rata, yaitu sebesar 4,84 cm dan 17,18 m. Kerapatan pohon berdiameter lebih besar dari 20 cm di lokasi penelitian, yaitu sebesar 98,65 individu per hektar. Jenis balam berasosiasi dengan akar kuning paling erat (indeks asosiasi 0,43), kemudian diikuti oleh jelutung (0,31), keruing, dan terentang masing-masing sebesar 0,21. Tegakan yang mendominasi pada lokasi penelitian dengan INP di atas 15% dalam habitat akar kuning untuk tingkat pohon, yaitu keruing (Dipterocarpus costulasus V.sl.), meranti (Shorea parvifolia Dyer), balam (Palaquium hexandrum Engl.), terentang (Campnosperma auriculata Hook.f.), dan jelutung (Dyera costulata Hook.f.).

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ANALISIS TINGKAT KERENTANAN PENCEMARAN AIR TANAH PADA WILAYAH PENAMBANGAN DAN PENGOLAHAN EMAS RAKYAT DESA PANCURENDANG, KABUPATEN BANYUMAS

ECOTROPHIC Jurnal Ilmu Lingkungan (Journal of Environmental Science) ◽

10.24843/ejes.2019.v13.i02.p04 ◽

2019 ◽

Vol 13 (2) ◽

pp. 159

Author(s):

Eni Muryani ◽

Dayu Aviana Rahmah ◽

Dian Hudawan Santoso

Keyword(s):

Groundwater Pollution ◽

Gold Mining ◽

Sampling Method ◽

Evaluation Method ◽

Groundwater Vulnerability ◽

Survey Method ◽

Analysis Method ◽

Surrounding Environment ◽

Pollutant Sources ◽

Aquifer Type

The people's gold mining and processing activities have an impact on the surrounding environment. Some residents immediately dispose of waste from gold processing into the environment. Therefore, analysis of the level of vulnerability of pollution is needed to determine the size of the level of difficulty and ease of contaminated substances to influence water quality, both surface water and groundwater. The purpose of this study was to analyze the level of vulnerability of groundwater pollution around the study area. The method used in this research is survey method and field mapping, sampling method: purposive sampling, laboratory analysis method, mathematical method, and descriptive evaluation method. The calculation to determine the level of vulnerability of pollution is the DRASTIC method for groundwater vulnerability with 7 parameters, namely groundwater depth, rainfall, aquifer type, soil texture, slope, slope, unsaturated zone type, and hydraulic conductivity. Based on the results of the study it was known that the study area had 2 classifications of the level of vulnerability of groundwater pollution, namely the moderate and high classification. Areas that are located in the direction of groundwater flow and are lower than pollutant sources will potentially be more polluted. Keywords : DRASTIC, Pollution, Groundwater, Gold Mine

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KERAGAMAN DAN POTENSI PEMANFAATAN VEGETASI GULMA PASCA PERTANAMAN PADI DI DESA PENGGARON KECAMATAN MOJOWARNO KABUPATEN JOMBANG

SAINTEKBU ◽

10.32764/saintekbu.v13i01.911 ◽

2021 ◽

Vol 13 (01) ◽

pp. 01-07

Author(s):

Anggi Indah Yuliana ◽

Mucharommah Sartika Ami

Keyword(s):

Sampling Method ◽

Animal Feed ◽

Diversity Index ◽

Oryza Sativa L ◽

Vegetation Types ◽

Vegetation Analysis ◽

Phyllanthus Urinaria ◽

Food Animal ◽

Canopy Area ◽

Biodiversity Analysis

A field study aims to determine the diversity and potential utilization of weed vegetation that grows after rice planting. This research was carried out in paddy fields after monoculture rice planting in Penggaron Village, Mojowarno District, Jombang Regency in July - September 2020. Sampling was based on the quadratic sampling method with sample plots arranged randomly. In each plot the data taken is the name, number and canopy (area of cover) of each plant species to determine density, dominance and frequency. Data analysis includes vegetation analysis to determine Summed Dominance Ratio (SDR) and biodiversity analysis calculated using the Shannon - Wienner diversity index. The results of this study were 26 types of weed vegetation were found in post-rice planting land. The dominant vegetation types include Oryza sativa L .; Limnocharis flava (L.) Buchenav; Phyllanthus urinaria L .; Monochoria vaginalis (Burm.f.) pressl; and Cleome viscosa L with an SDR value of ≥ 5.30%. A total of 15 types of weeds have the potential to be used as a source of food, animal feed, and traditional medicine.

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PEMANFAATAN TANAMAN REFUGIA MENGENDALIKAN HAMA PADI (Oryza nivara L) DI SOPORARU TAPANULI UTARA

AGRIFOR ◽

10.31293/agrifor.v20i2.5744 ◽

2021 ◽

Vol 20 (2) ◽

pp. 299

Author(s):

Ameilia Zuliyanti Siregar ◽

Sampe Lesnida

Keyword(s):

Plant Disease ◽

Sampling Method ◽

Diversity Index ◽

Red Rice ◽

Rice Pests ◽

Evenness Index ◽

Yellow Traps ◽

Richness Index ◽

North Sumatra ◽

Land Using

The refugia plant is one of the flowers that can be used as a shelter for natural enemies and as a feed sources for insects. The purpose of this study was to compare the use of refugia and without refugia plants in controlling environmentally friendly red rice pests in Soporaru Hamlet, Sigotom JuluVilalge, Pangaribuan District, North of Tapanuli Regency, North of Sumatra Province. This study uses a purposive sampling method with 3 types of traps, namely: yellow traps, fall traps and net traps. The samples was identified in the Plant Disease Laboratory, Faculty of Agriculture, University of North Sumatra in July 2020 until February 2021. The results showed that 8 orders of refugia were caught on land using refugia, 23 families, and 1,952 individuals, while on land without refugia there were 8 orders, 22 families and 1,807 individuals. On land using refugia (r) compared to land without refugia (k) it is known that the Species Richness Index (R) (Rr=2.9 and Rk=2.8), Diversity Index (H) (Hr=2.67 and Hk= 2.19), and Evenness Index (E) (Er=0.85 and Ek=0.71). Function status identified on land using refugia and without refugia as many as 5 species, namely herbivores, pollinators, predators, parasitoids and scavengers.

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The Diversity of Ferns (Pteridophyta) in North Sumatera (Case Study: Batang Gadis National Park Resort 7 Sopotinjak)

AGRINULA: Jurnal Agroteknologi dan Perkebunan ◽

10.36490/agri.v4i2.167 ◽

2021 ◽

Vol 4 (2) ◽

pp. 152-161

Author(s):

Nurul Lita Handayani ◽

Husnarika Febriani ◽

Melfa Aisyah Hutasuhut

Keyword(s):

National Park ◽

Diversity Index ◽

Ground Cover ◽

Survey Method ◽

Asplenium Nidus ◽

Research Types ◽

Descriptive Survey ◽

North Sumatra ◽

Ground Cover Vegetation

Introduction: Ferns (Pteridophyta) are plant communities that have an ecological function as ground cover vegetation. The purpose of this research types of ferns (Pteridophyta) and the diversity index of ferns found in the Batang Gadis National Park Resort 7 Sopotinjak, Batang Natal Sub-district, Mandailing Natal District, North Sumatra Province. Materials and Methods: Descriptive survey method using quadratic plot of 24 plots in three transects. Results: It was found that five from 28 species of dominant fern were: Asplenium nidus, Asplenium normale, Shaeropteris glauca, Oleandra undulate, and Asplenium lobulatum. The diversity index of ferns (Pteridophyta) of 2.494 and was categorized as moderate, which means that the ferns (Pteridophyta) are stable, this indicates that the ecosystem is in a fairly balanced state.

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