scholarly journals Perubahan Struktur Vegetasi Pada Sistem Perladangan Gilir Balik Masyarakat Dayak Pitap Kalimantan Selatan

2019 ◽  
Vol 18 (2) ◽  
pp. 63
Author(s):  
Sri Ulfah ◽  
Endah Sulistyawati
Keyword(s):  
Environmental Factors ◽  
Nutrient Content ◽  
Research Use ◽  
Vegetation Distribution ◽  
Cultivation System ◽  
Belt Transect ◽  
Vegetation Parameters ◽  
Forest Lands ◽  
Chronosequence Approach ◽  
Diameter Classes

Shifting cultivation is cultivation system performed alternately from one field to another on forest lands. This study aims to assess changes in structure and composition of vegetation and determine the conditions of environmental factors during shifting period. This research use chronosequence approach at sites with different ages i.e. two, four, six and eight years compared to natural forest using structured form squares (20x100 m2) belt transect comprising several terraced plots. Vegetation parameters were measured for all forms, environmental factors measured were microclimates and edafic factors and soil macro-nutrient content. The results showed that 42 species of 23 families founded in all forms. The vegetation distribution from diameter classes (KD) indicated that KD 0-10 cm had the highest number of individual density from all research site and declined sharply with the increase of KD. The potential regeneration of tree species vegetation component of each site showed some different patterns. In aspect of microclimates, the temperature decreases along with sites age. Edafic factor did not show any clear pattern with increase of sites age for C, N and P, while soil K levels were significantly higher in the youngest site age than the older sites.

scholarly journals Sebaran Klorofil a, Nitrat, Fosfat dan Plankton Sebagai Indikator Kesuburan Ekosistem Mangrove Tugurejo Semarang

2018 ◽  
Vol 16 (1) ◽  
pp. 68
Author(s):  
Anik Prihatin ◽  
Prabang Setyono ◽  
Sunarto Sunarto
Keyword(s):  
Environmental Factors ◽  
Chlorophyll A ◽  
Aquatic Ecosystems ◽  
Trophic Status ◽  
Nutrient Content ◽  
Mangrove Ecosystem ◽  
Nitrate Content ◽  
Aquatic Biota ◽  
Phosphate Content ◽  
Trophic Index

ABSTRAKEkosistem mangrove merupakan suatu interaksi yang terjadi antara tanaman – tanaman mangrove dengan faktor lingkungan perairan mangrove sehingga dapat menyebabkan terjadinya kesuburan perairan dan sebagai tempat mencari makan alami bagi biota – biota perairan. Tujuan penelitian ini adalah untuk mengetahui sebaran klorofil-a, nitrat dan fosfat serta plankton pada ekosistem mangrove yang berguna untuk kelestarian hidup biota – biota perairan Mangrove. Penelitian ini dilaksanakan bulan Oktober – November 2017 di Mangrove Tapak Tugurejo Semarang. Hasil penelitian ini didapatkan kandungan klorofil a rata – rata 0,165 mg/l, kandungan nitrat rata – rata 2,188 mg/l dan kandungan fosfat rata – rata 0,045 mg/l. Kelimpahan fitoplankton ditemukan sebanyak 23 spesies dan zooplankton ditemukan sebanyak 5 spesies. Berdasarkan status indeks trofik perairan Mangrove Tapak Tugurejo Semarang termasuk dalam kategori perairan mesotrofik, yakni unsur hara dan nutrien dalam perairan mangrove kurang tersedia banyak atau sedang dan belum tercemar. Kondisi kesuburan ekosistem mangrove terpantau cukup baik bila dibandingkan dengan kandungan – kandungan unsur hara, klorofil a dan plankton yang melimpah di perairan penelitian, sehingga memungkinkan banyak terdapat kehidupan biota – bioata perairan. Kesimpulan dari penelitian ini adalah kandungan unsur hara (nitrat dan fosfat) dan klorofil a serta plankton diperairan mangrove sangat mempengaruhi kesuburan ekosistem perairan, serta plankton yang mendominasi tempat penelitian ialah dari kelas Baccilariophyceae sebanyak 21 spesies.Kata kunci: Status trofik, Plankton, Ekosistem Mangrove,  Mangrove Tapak Tugurejo Semarang.ABSTRACTMangrove ecosystem is an interaction that occurs between mangrove plants with environmental factors of mangrove waters that can cause the occurrence of water fertility and as a place of natural foraging for aquatic biota. The purpose of this research is to know the distribution of chlorophyll a, nitrate and phosphate and plankton in mangrove ecosystem which is useful for the preservation of biota life of Mangrove waters. This research was conducted in October - November 2017 at Tapak Mangrove Tugurejo Semarang. The results of this study obtained an average chlorophyll-1 content of 0.165 mg / l, an average nitrate content of 2.188 mg / l and an average phosphate content of 0.045 mg / l. Abundance of phytoplankton found as many as 23 species and zooplankton found as many as 5 species. Based on the trophic index status of Mangrove waters Tapak Tugurejo Semarang included in the category of mesotrophic waters, the nutrients and nutrients in the mangrove waters are less available or moderate and not contaminated. The condition of mangrove ecosystem fertility is observed quite well when compared with nutrient content, chlorophyll-a and plankton abundant in research waters, thus allowing many life biota - bioata waters. The conclusion of this research is the content of nutrients (nitrate and phosphate) and chlorophyll a and plankton in mangrove waters greatly affect the fertility of aquatic ecosystems, and the plankton that dominate the research site is from the Baccilariophyceae class of 21 species.Keywords : Trophic Status, Plankton, Mangrove Ecosystem, Mangrove Tapak Tugurejo SemarangCitation: Prihatin, A, Setyono, P dan Sunarto (2018). Sebaran Klorofil-a, Nitrat, Fosfat dan Plankton Sebagai Indikator Kesuburan Ekosistem di Mangrove Tapak Tugurejo Semarang. Jurnal Ilmu Lingkungan, 16(1), 68-77, doi:10.14710/jil.16.1.68-77

scholarly journals Korelasi Nitrat Fosfat Sedimen terhadap Ekosistem Lamun di Pulau Sintok dan Bengkoang, Karimunjawa, Jawa Tengah

2020 ◽  
Vol 9 (3) ◽  
pp. 303-310
Author(s):  
Rachmantino Wibowo ◽  
Nur Taufiq-SPJ ◽  
Ita Riniatsih
Keyword(s):  
Environmental Factors ◽  
Pearson Correlation ◽  
Marine Ecosystem ◽  
Nutrient Content ◽  
Nitrate Content ◽  
Strong Positive Correlation ◽  
Phosphate Content ◽  
Seagrass Ecosystem ◽  
Sea Grass ◽  
Statistical Analysis Method

ABSTRAK: Taman Nasional Karimunjawa merupakan daerah yang memiliki ekosistem laut yang masih lengkap dan asri. Ekosistem Lamun merupakan salah satu ekosistem laut yang memiliki banyak peranan bagi kehidupan di laut. Penelitian ini bertujuan untuk mengetahui hubungan kandungan nutrien nitrat dan fosfat pada substrat sedimen terhadap kondisi ekosistem lamun di Pulau Sintok dan Pulau Bengkoang Lamun merupakan organisme yang hidupnya sangat dipengaruhi oleh faktor-faktor lingkungan. Kandungan nutrien substrat merupakan salah satu faktor lingkungan yang mampu mempengaruhi kehidupan lamun. Nitrat dan fosfat merupakan nutrien esensial yang sangat penting untuk menunjang pertumbuhan dan perkembangan lamun. Penelitian ini bertujuan untuk mengetahui hubungan antara kandungan nutrien sedimen terhadap kerapatan lamun di Pulau Sintok dan Pulau Bengkoang, Karimunjawa. Perbedaan jumlah nitrat dan fosfat di lingkungan diduga dapat mempengaruhi kondisi lamun di Pulau Sintok dan Bengkoang. Metode pengamatan kondisi ekosistem lamun menggunakan metode seagrasswatch. Metode analisis statistika yang digunakan adalah analisis pearson-correlation. Analisis hubungan kandungan nitrat dan fosfat terhadap kerapatan lamun di Pulau Sintok didapatkan nilai korelasi pada nitrat sebesar -0,425 dan fosfat sebesar -0,422. Analisis hubungan di Pulau Bengkoang didapatkan nilai korelasi pada nitrat sebesar -0,933 dan fosfat sebesar 0,849. Dari penellitian ini dapat diambil kesimpulan bahwa nutrien nitrat dan fosfat sedimen di Pulau Sintok memiliki arah hubungan negatif dengan kekuatan hubungan yang cukup terhadap kerapatan lamun. Kandungan nitrat sedimen di Pulau Bengkoang memiliki hubungan sangat kuat negatif, sedangkan kandungan fosfat sedimen memiliki hubungan sangat kuat positif terhadap kerapatan lamun. ABSTRACT: Karimunjawa National Park is an area that has a complete and beautiful marine ecosystem. Seagrass Ecosystem is one of the marine ecosystems that has many roles for life at sea. The aim of this study was to understand correlation of the nutrient (Nitrate Phosphate) in the sediment to sea-grass ecosystem at Sintok and Bengkoang Islands. Sea-grass is an organism whose life is strongly influenced by environmental factors. The nutrient content of the substrate is one of the environmental factors that can affect the life of seagrass. Nitrate and phosphate are essential nutrients that are very important to support the growth and development of seagrass. This study aims to determine the correlation between sediment nutrient content on the density of seagrass in Sintok Island and Bengkoang Island, Karimunjawa. The difference in the amount of nitrate and phosphate in the environment is thought to affect the condition of seagrass in Sintok and Bengkoang Islands. The method of observing seagrass ecosystem condition uses seagrasswatch method. The statistical analysis method used is the Pearson-correlation analysis. Analysis of the correlation of nitrate and phosphate content to the density of seagrass on Sintok Island obtained a correlation value of nitrate of -0.425 and phosphate of -0.422. Analysis of the correlation on Bengkoang Island obtained a correlation value of nitrate of -0.933 and phosphate of 0.849. This study can be concluded that the nutrient nitrate and phosphate sediment on Sintok Island has a negative correlation with an adequate strength of correlation to seagrass density. The sediment nitrate content in Bengkoang Island has a very strong negative correlaation, while the sediment phosphate content has a very strong positive correlation to the density of seagrass.

scholarly journals Effect of Environmental Factors on Rangeland Vegetation Distribution in Divan-Darre Area, Kurdistan

2015 ◽  
Vol 4 (11) ◽  
pp. 27-39 ◽  
Author(s):  
H. Pourbabaei ◽  
V. Rahimi ◽  
M. N. Adel ◽  
◽  
◽  
...  
Keyword(s):  
Environmental Factors ◽  
Vegetation Distribution

scholarly journals Impact of N-fixing bacterium Nitrospirillum amazonense on quality and quantitative parameters of sugarcane under field condition

2020 ◽  
pp. 1870-1875
Author(s):  
Pietro de Santis Sica ◽  
Eric Seiji Shirata ◽  
Fabiano Aparecido Rios ◽  
Denis Fernando Biffe ◽  
José Usan Torres Brandão Filho ◽  
...  
Keyword(s):  
Nutrient Content ◽  
Sugar Yield ◽  
Field Conditions ◽  
Cultivation System ◽  
Quantitative Parameters ◽  
Production Quantity ◽  
Biological Nitrogen ◽  
Sugarcane Stem ◽  
The Impact ◽  
Different Doses

Sugarcane is the world’s largest crop by production quantity. In Brazil, the sugarcane cultivation requires 30-70% less nitrogen than in other countries, due to the biological nitrogen fixation. Nitrospirillum amazonense is an N-fixing bacterium that has proven to increase plant growth and yields of sugarcane in greenhouse experiments. However, studies on field conditions are very scarce. For these reasons, this study aimed to assess the impact of different doses of a pre-commercial product, Aprinza®, containing N. amazonense on quality and quantitative parameters of the cultivar RB867515 in field conditions. The plant height, number of internodes, stem yield and sugar yield were measured. The leaf nutrient content was analyzed 60, 90 and 180 days after planting and the plant nutrient content was analyzed after harvest. The inoculation of N. amazonense did not affect the leaf and the stem nutrient content positively. The stem yield was increased 27.5 tons ha-1 (20%) and the total recoverable sugar yield increased 4.6 tons ha-1 (25%), compared to the control, by using 1 liter of Aprinza® per hectare. Therefore, N. amazonense can increase sugarcane stem and sugar yields in sandy soils with low nitrogen application, reducing the environmental impacts of the sugarcane cultivation system.

scholarly journals STUDI BIOMASSA LAMUN (Enhalus acoroides L.) DAN (Halodule pinifolia) BERDASARKAN KEDALAMAN AIR LAUT DI PANTAI DESA TANJUNG TIRAM SULAWESI TENGGARA

2019 ◽  
Vol 5 (2) ◽  
Author(s):  
Lisdawati Lisdawati ◽  
Sitti Wirdhana Ahmad ◽  
Laode Siwi
Keyword(s):  
Environmental Factors ◽  
Light Intensity ◽  
Water Depth ◽  
Sampling Method ◽  
Sea Water ◽  
Nutrient Content ◽  
Total Biomass ◽  
Sampling Area ◽  
Seagrass Biomass ◽  
Depth Water

ABSTRAK Penelitian ini bertujuan untuk mengetahui biomassa dan faktor lingkungan yang mempengaruhi kandungan biomassa lamun Enhalus acorroides L. dan Halodule pinifolia berdasarkan kedalaman air laut di Pantai Desa Tanjung Tiram. Penelitian ini telah dilakukan pada bulan Juni - Agustus 2018. Penelitian ini bersifat eksploratif. Pengambilan sampel dilakukan pada tiga titik pengamatan dengan menggunakan metode purposif sampling berdasarkan kedalaman perairan yaitu kedalaman 1 meter, 2 meter dan 3 meter. Hasil penelitian menunjukkan bahwa kandungan biomassa lamu Enhalus acorroides L. yang terdapat pada kedalaman 1 m total biomassa 316,73 g/m2, kedalaman 2 m total biomassa 197,56 g/m2 dan kedalaman 3 m total biomassa 38,26 g/m2. Kandungan biomassa jenis lamun Halodule pinifolia pada kedalaman 1 m total biomassa 1,6 g/m2, kedalaman 2 m total biomassa 2,97 g/m2 dan kedalaman 3 m total biomassa 0,25 g/m2. Faktor lingkungan yang mempengaruhi kandungan biomassa lamun Enhalus acorroides L. dan Halodule pinifolia pada Perairan Pantai Desa Tanjung Tiram yaitu substrat, kandungan bahan organik (KOT), intensitas cahaya, suhu, salinitas dan kekeruhan. Kata kunci : Biomassa, Enhalus acorroides L. dan Halodule pinifolia ABSTRACT This study aims to determine the biomass and environmental factors that influence the seagrass biomass content of Enhalus acorroides L. and Halodule pinifolia based on the depth of sea water in Tanjung Tiram Village Beach. This research was conducted during June-August 2018. This research was explorative. Sampling area were carried out at three points by observation using purposive sampling method depth water depth of 1 meter, 2 meter and 3 meter. The biomass was estimated in the plot, while enviromental factors that influence the seagrass biomass content of Enhalus acorroides L. and Halodule pinifolia in Tanjung Tiram Village Beach are substrate, nutrient content (KOT), light intensity, temperature, salinity and turbidity. The results showed that Enhalus acorroides L biomass contained at a depth of 1 m total biomass of 316.73 g/m2, depth of 2 m total biomass of 197.56 g/m2 and depth of 3 m total biomass of 38.26 g/m2. Biomass content of Halodule pinifolia seagrass at a depth of 1 m total biomass of 1.6 g / m2, depth of 2 m total biomass of 2.97 g/m2 and a depth of 3 m of total biomass of 0.25 g / m2. Keywords: Biomass, Enhalus acorroides L. and Halodule pinifolia

scholarly journals Diversity of Mushroom Coral (Fungidae) in Siladen Waters, North Minahasa

2014 ◽  
Vol 1 (4) ◽  
pp. 158 ◽  
Author(s):  
Bambang Hermanto
Keyword(s):  
Southeast Asia ◽  
Shallow Water ◽  
Coral Species ◽  
Diversity Index ◽  
Reef Slope ◽  
High Abundance ◽  
Research Use ◽  
Pacific Region ◽  
Mushroom Coral ◽  
Belt Transect

Mushroom coral are well known in the waters of southeast asia because in this region has encountered in high abundance in shallow water and reef slope. Research on the diversity of mushroom coral (Fungiidae) conducted in July in the sea of Siladen island with four observation stations, they are Siladen I, Siladen II, Siladen III and Siladen IV. The research aims to determine mushroom coral species and diversity in the sea of Siladen Island, North Minahasa. This research use belt transect method and be extends parallel of the shoreline with 50x3m length of transects. The results showed that 13 species from seven genera were recorded. They are Fungia, Heliofungia, Ctenactis, Herpolitha, Polyphyllia, Sandalolitha and Podabacia. The number of coral species are found in the sea of Siladen island reached 32% of all coral species in the tropical Indo-Pacific region. Diversity Index of mushroom coral in the Siladen waters ranged from 0.837–0.97. Mushroom coral density each station ranged from 0,11-0,22 ind/m2.Keywords : Diversity, mushroom coral, Siladen Island, North Minahasa

New Beginnings in East Timorese Forest Management

2003 ◽  
Vol 34 (2) ◽  
pp. 307-327 ◽  
Author(s):  
Andrew McWilliam
Keyword(s):  
Forest Management ◽  
Environmental Factors ◽  
Sustainable Forestry ◽  
Forest Resources ◽  
East Timor ◽  
Management Approach ◽  
Policy Options ◽  
New Beginnings ◽  
Forest Lands

Among the array of pressing development requirements facing East Timor is the need to create a new strategic national management approach for forest resources. This article explores the historical and environmental factors that have contributed to the contemporary pattern of forest lands and discusses policy options to support the development of a sustainable forestry future.

scholarly journals PENGARUH KARAKTERISTIK INDIVIDU DAN FAKTOR LINGKUNGAN TERHADAP KEPUTUSAN PEMBELIAN (Studi Pada Pembelian Produk Asuransi Jiwa Unit Link Di Jakarta)

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Devi Krisnawati
Keyword(s):  
Individual Differences ◽  
Environmental Factors ◽  
Random Sampling ◽  
Descriptive Analysis ◽  
Sampling Technique ◽  
Research Use ◽  
Insurance Company ◽  
Multiple Linear Regressions ◽  
Descriptive Research ◽  
Linear Regressions

<em>This research use descriptive research with quantitative approach. There are three variables that are used in this research: Individual Differences, Environmental Factors and Buying Decision. The collection of data obtained through online questionnaires, which were distributed randomly in Jakarta. The sample in this research was 100 respondents. The sampling technique of this research is random sampling. The data analysis uses descriptive analysis and multiple linear regressions. The results in this research showed that Individual Differences and Environmental Factors simultaneously affecting Buying Decision significantly. The other results showed that Individual Difference and Environmental Factors partially affecting Buying Decision significantly. Based on the result of this research, it’s better for Insurance Company to considerate people personal individual differences and also environmental factors to strengthen the sales of unit link product.</em>

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