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DIATOM STRATIGRAPHY OF MANGROVE ECOSYSTEMS ON THE NORTHERN COAST OF CENTRAL JAVA

JOURNAL OF COASTAL DEVELOPMENT Vol 15, No 2 (2012): Volume 15, Number 2, Year 2012
Publisher : JOURNAL OF COASTAL DEVELOPMENT

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Abstract

The natural mangrove ecosystems along the Northern Coast of Central Java were very limited in extent, even had replanted almost twenty years ago. Naturally, the upper layer of sediment are the latest deposition (superposition). Environmental condition recently are recorded in the top sediment layer, and can be used to reconstruct past condition  (the present is the key to the past). The potential use of diatoms to reconstruct palaeoecology is well established. Diatoms are microscopic algae that form siliceous frustules which make them well preserved in sediment. Diatoms and their assemblages are very useful as integrated indicators of environmental changes because their distribution is closely linked to water quality parameters as well as their affinities to several physical habitats. This research was conducted in order to determine the changes of mangrove ecosystem in the Northern Coast of Central Java based on diatom stratigraphy. Sediment samples from mangrove sites were taken from Pekalongan, Brebes, Semarang, Demak and Rembang. Diatom analysis, consist of digestion, preparation, and identification. The diatom stratigraphy was performed by Software of  C2 1.5.1. Stratigraphycally, the mangrove ecosystems along the Northern Coast of Central Java were previously more influenced by freshwater rather than the marine sources which dominate today.

PERUBAHAN MORFOLOGI UMBI KENTANG KONSUMSI (Solanum tuberosum L. Var Granola) SETELAH PERLAKUAN CARA DAN WAKTU PENYIMPANAN YANG BERBEDA

Jurnal Akademika Biologi Vol. 3 No. 1 Januari 2014
Publisher : Departemen Biologi, Fakultas Sains dan Matematika Undip

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Abstract

Agriculture product storage is an important that must be done in post harvest handling. Potato is one of the easily broken product, so that a good handling is needed to mantain quality as one of functional food. The present study aims to know the effects of methode and time storage of morphology tuber potato consumption. This  research  uses Completely Randomize Design on  factorial pattern with  two  factors.  First, method storage (K1); saved in open container, (K2); saved in close container. Second, time storage (T1); 2 weeks, (T2); 4 weeks, (T3);  6 weeks, (T4); 8 weeks, (T5); 10 weeks. This research uses 10 treatments and 3 replications. The parameter includes morphology quantitatively: diameter decreasing, total black spot, percentage of breakage and morphology qualytatively: surface alteration and bud. Data were analyzed using  ANOVA, followed by Duncan’s test at the significance level of 95%. The results showed that storage method in open container (K1) tends increase diameter shrinkage. Storage time caused alteration of morphology in quantitative and qualytative. Interaction between method and time of storage influence in total black spot (p<0,05). Storage of potato tuber consumption had better kept at a distance from light presence less 4 weeks. Keywords: storagemethod, storagetime, Solanum tuberosum L., morphology

KEANEKARAGAMAN TUMBUHAN BERDASARKAN CIRI MORFOLOGI POLEN DAN SPORA DARI SEDIMEN TELAGA WARNA, DIENG, KAB. WONOSOBO, JAWA TENGAH

Jurnal Akademika Biologi Vol. 5 No. 1 Januari 2016
Publisher : Departemen Biologi, Fakultas Sains dan Matematika Undip

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Abstract

Pollen and spore may be used to identify the name of plants because on pollen and spore there is an outter wall, called exine, which have specific structure and sculpture. This specific morphology of pollen and spore may be easily identified, therefore the name of plant itself may be known directly. The aim of this research is to find out the various of pollen and spore morphology of Telaga Warna sediment and the name of plant itself may be known,moreover the plant diversity and the plant which is dominant around Telaga Warna may be known as well. This research had been conducted with fetched the sediment sample from the edge of Telaga Warna, Dieng, preparation of sample were using chemical, and finally make microscopic preparation.Pollen and spore observed by some parameters: shape, size, polarity, symmetry, aperture, and sculpture. The information, furthermore, analyzed by making description of pollen and spore morphology and quantitative data. The result of this research reaveal that there are 34 kind of plants from pollen and spore observation. The amount of Pteridophytes is 53%, Non-Arboreal Pollen (NAP) is 29%, and Arboreal Pollen (AP) is 18%. The plant which dominant around Telaga Warna is Polypodiaceae, with the value of dominance index is 5,66. Its spore morphology has trilete aperture, heteropolar, bilateral symmetry, and the sculpture is psilate. The average of plant diversity temporally in Telaga Warna is low, with the average value of diversity index is 1,56, however the alteration of vegetation temporally in Telaga Warna is stable dynamics.Keywords: morphology, pollen, spore, Telaga Warna

Morfoanatomi Polen Flora Mangrove Di Pantai Banjir Kanal Timur, Semarang

Jurnal Akademika Biologi Vol. 4 No. 3 Juli 2015
Publisher : Departemen Biologi, Fakultas Sains dan Matematika Undip

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Abstract

Indonesia has the largest mangrove area in the world that covering an area of 2.5-5 million ha. Indonesia's vast mangrove area has been declined by 50%. Locations that becoming sampling stations, namely East Flood Canal (BKT) undergo abrasion that caused water-logging in mangrove forest areas that affect the diversity of plants in it. Plant diversity can be learned through the pollen of plants. Morphology-anatomy can be used as additional criteria for identifying plant species. The aim of this study was to determine the diversity of plants and morphology-anatomy pollen of plants on the coast BKT. Sampling was conducted using roaming at both locations. Data were analyzed by making the description and classification. The results showed that mangrove forests in BKT have a diversity of plants as many as 9 species. Morphology-anatomy pollen of different species have a variety of shapes and sizes. Keywords: mangrove, morphology-anatomy, pollen, Semarang

PENGARUH PUPUK NANOSILIKA TERHADAP PERTUMBUHAN DAN PRODUKSI TANAMAN KAPAS (GOSSYPIUM HIRSUTUM L. VAR. KANESIA 8)

Jurnal Akademika Biologi Vol. 6 No. 2 April 2017
Publisher : Departemen Biologi, Fakultas Sains dan Matematika Undip

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Abstract

Cotton (Gossypium hirsutum L.) is one of agricultural commodity which produces natural fiber as a raw material for the textile industry has a lot of constraints in its cultivation which not optimal, so the improvement of cultivation techniques by performing a balanced fertilizer can be done. Indonesian agricultural soil generally has low fertility rate and silica availability, so silica fertilization would be necessary. Silica causes leaves and stems of plant become upright so the photosynthesis will increased. Nanosilica that contains very small elements of silica which makes it easily absorbed by plants in order to increase growth and yield of cotton. This research aims to determine the effect of nanosilica fertilizer to the growth and production and also to know the effective amount of nanosilica concentration which will increase it of cotton Kanesia 8. The study design was using RAL with 5 different treatments of nanosilica fertilizer amount: 0 ml/L, 2.2 ml/L, 4.2 ml/L, 6.2 ml/L dan 8.2 ml/L with 5 repetitions. The data analysis was using ANOVA and if there is a significantly different then the analysis followed by further test of Duncan's Multiple Range Test (DMRT) at 95% of significance level. The results showed that nanosilica fertilizer with a concentration 2.2 ml/L increased the plant growth mainly at fresh weight of plant by 74.62% and dry weight of plant by 33.66% and it also increased the production of plant mainly in the percentage of fruit changed into cotton by 19.71% and dry weight of cotton by 0.98% than the control treatment.Keywords: nanosilica, growth, production, Gossypium hirsutum

STATUS TROFIK DANAU RAWAPENING DAN SOLUSI PENGELOLAANNYA

JURNAL SAINS DAN MATEMATIKA Volume 18 Issue 4 Year 2010
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

ABSTRACT---Eutrofikasi adalah pengkayaan perairan oleh unsur hara, khususnya nitrogen dan fosfor sehingga mengakibatkan pertumbuhan tidak terkontrol dari tumbuhan air. Berdasarkan kandungan unsur haranya, maka perairan dapat dikategorikan menjadi oligotrofik, mesotrofik dan eutrofik. Danau Rawapening menerima inlet dari 16 sungai dan hanya memiliki 1 outlet, menyebabkan akumulasi materi yang cukup tinggi. Penelitian ini bertujuan untuk mengkaji status trofik Danau Rawapening, sehingga dapat menjadi landasan dalam upaya pengembangan pengelolaannya. Pengambilan sampel air dilakukan pada Februari 2008 pada 7 titik untuk analisis fitoplankton dan kandungan total nitrogen, fosfor, silikon, potasium, kalsium dan mangaan. Pengukuran temperatur, DO, pH, kekeruhan, konduktivitas, turbiditas dilakukan secara in-situ. Pengambilan sampel air untuk analisis BOD dilakukan menggunakan 2 botol gelap 300mL, botol pertama diukur DO0, botol ke-2 diinkubasi selama 5 hari kemudian dihitung DO5.. Penghitungan kandungan klorofil menggunakan metode spektrofotometri. Berdasarkan kandungan klorofilnya, maka dapat dihitung nilai produktivitas primer. Berdasarkan kandungan Total Fosfor Danau Rawa Pening dalam kondisi mesotropik, tapi berdasarkan kandungan Total Nitrogen dankecerahan perairan yang kurang dari 2 meter termasuk dalam kondisi eutrofik. Hal ini ditunjukkan oleh dominannya Aulacoseira granulata dan Melosira varians. Kualitas air seperti pH, DO, kecerahan, kandungan logam berat mengalami degradasi dan cenderung melebihi ambang batas Baku Mutu Lingkungan. Ekoteknologi merupakan pendekatan yang dapat diimplementasikan di Danau Rawapening, menjadikan eceng gondok sebagai sabuk hijau, dan pembuatan preimpoundment di hilir inlet sebelum masuk ke danau.Key words: status trofik, eutrofikasi, danau Rawapening, pengelolaan danau

Komunitas Fitoplankton Danau Rawapening

SAINS DAN MATEMATIKA Volume 19 Nomor 1 Tahun 2011
Publisher : SAINS DAN MATEMATIKA

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Abstract

Fitoplankton merupakan produsen primer perairan, sehingga keberadaannya sangat penting untuk tingkatan trofik di atasnya. Komunitas fitoplankton sangat ditentukan oleh kualitas perairan, sehingga fitoplankton dapat digunakan sebagai bioindikator kualitas perairan. Tekanan lahan di bagian hulu merupapan problem utama. Danau Rawapening. Volume air Danau Rawapening cenderung menurun sebagai akibat sedimentasi yang cukup tinggi, sehingga mengganggu fungsi utamanya. Penelitian ini bertujuan mengkaji komunitas fitoplankton Danau Rawapening. Pengambilan sampel dilakukan pada 7 lokasi di Danau Rawapening. Identifikasi fitoplankton dilakukan menggunakan SRC dan mikroskup perbesaran 400  –  1.000 kali. Dijumpai 58 spesies fitoplankton dengan dominansi Bacillariophyta. Berdasarkan keanekaragaman fitoplankton, maka ekosistem Danau Rawapening kurang stabil  –  cukup stabil. Dominannya  Aulacoseira granulata mengindikasikan kondisi eutrofik danau. Penelitian perlu dilanjutnya pada musim dan waktu yang berbeda.Keywords: fitoplankton, Danau Rawapening, eutrofik, bioindikator

Komunitas Fitoplankton Danau Rawapening

JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 1 Year 2011
Publisher : JURNAL SAINS DAN MATEMATIKA

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Abstract

Fitoplankton merupakan produsen primer perairan, sehingga keberadaannya sangat penting untuk tingkatan trofik di atasnya. Komunitas fitoplankton sangat ditentukan oleh kualitas perairan, sehingga fitoplankton dapat digunakan sebagai bioindikator kualitas perairan. Tekanan lahan di bagian hulu merupapan problem utama Danau Rawapening.Volume air Danau Rawapening cenderung menurun sebagai akibat sedimentasi yang cukup tinggi, sehingga mengganggu fungsi utamanya. Penelitian ini bertujuan mengkaji komunitas fitoplankton Danau Rawapening. Pengambilan sampel dilakukan pada 7 lokasi di Danau Rawapening. Identifikasi fitoplankton dilakukan menggunakan SRC dan mikroskup perbesaran 400 – 1.000 kali. Dijumpai 58 spesies fitoplankton dengan dominansi Bacillariophyta. Berdasarkan keanekaragaman fitoplankton, maka ekosistem Danau Rawapening kurang stabil – cukup stabil. Dominannya Aulacoseira granulata mengindikasikan kondisi eutrofik danau. Penelitian perlu dilanjutnya pada musim dan waktu yang berbeda.   Keywords: fitoplankton, Danau Rawapening, eutrofik, bioindikator

Aplikasi Pupuk Organik Kotoran Ayam dan Jerami Padi pada Pertumbuhan dan Produksi Bawang Merah (Allium cepa L. var. bima curut)

Buletin Anatomi dan Fisiologi (Bulletin of Anatomy and Physiology) Volume 3, Nomor 2, Tahun 2018
Publisher : Departemen Biologi Universitas Diponegoro

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Abstract

Salah satu varietas bawang merah lokal adalah bima curut dengan kemampuan adaptasi yang baik, ukuran umbi besar, dan jumlah anakan yang banyak. Optimasi peningkatan produksi bawang merah salah satunya melalui pemupukan menggunakan pupuk organik dari kotoran ayam dan jerami padi. Tujuan penelitian ini adalah mengetahui pengaruh pupuk organik dari bahan kotoran ayam dan jerami padi terhadap pertumbuhan dan produksi bawang merah. Rancangan penelitian yang digunakan adalah RAL (Rancangan Acak Lengkap), dengan 7 perlakuan yaitu: P0 (tanpa pupuk); P1 (pupuk anorganik); P2 (pupuk kotoran ayam:pupuk jerami, perbandingan 0:1); P3 (pupuk kotoran ayam:pupuk jerami, perbandingan 1:0); P4 (pupuk kotoran ayam:pupuk jerami perbandingan 1:1); P5 (Pupuk kotoran ayam:pupuk jerami, perbandingan 1:2); P6 (pupuk kotoran ayam:pupuk jerami, perbandingan 2:1); tiap perlakuan dengan 4 ulangan. Analisis data menggunakan Analysis of Variance dilanjutkan dengan uji Duncan’s Multiple Range Test pada taraf signifikasi 95%. Hasil penelitian menunjukkan bahwa penggunaan pupuk organik kotoran ayam dan jerami padi berpengaruh nyata meningkatkan pertumbuhan dan produksi bawang merah berupa: jumlah daun sebesar 41% dan tinggi tanaman sebesar 42%, serta jumlah umbi/rumpun sebesar 41%; jumlah umbi/m2 sebesar 22%; berat basah sebesar 35%; dan berat kering sebesar 31% dibandingkan kontrol (P0).

Pengaruh Pemberian Kombinasi Pupuk Organik Padat dan Organik Cair Terhadap Porositas Tanah dan Pertumbuhan Tanaman Bayam (Amarantus tricolor L.)

Jurnal Akademika Biologi Vol. 3 No. 2 April 2014
Publisher : Departemen Biologi, Fakultas Sains dan Matematika Undip

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Abstract

The porosity of soil is one of the parameters of soil porosity. Tanah Merah in Madura island  has low fertility. This soil not good to used because the physical structure and  has low nutrition. The addition of organic materials from solid and liqiud organic fertilizer can increase soil porosity and spinach  growth. The research aimed to determine the effect of solid, liquid organic fertilizer, and their combination to  increase porosity and spinach growth. The design of the research is completely randomized design (RAL) with a single factor with combination treatment media, control treatment with no treatment to media (P0), media were given solid organic fertilizer (P1),  media were given liquid organic fertilizer (P2), and media were given combination of solid and liquid organic fertilizer (P3). Analysis of the data used  Analysis of Variance ( ANOVA ) continued by DMRT test with significance level of 95%. The results of the research showed organic fertilizer given effect to the increase in porosity of the soil and plant growth, as well as the provision of combination solid and liquid organic fertilizer are the most optimal fertilizer for soil porosity and spinach growth. Keywords : Spinach, solid organic fertilizer, liquid organic fertilizer, soil porosity, spinach growth