Articles

RADIAL VARIATION IN MICROFIBRIL ANGLE OF SUPER AND COMMON TEAK WOOD Krisdianto, Krisdianto
Indonesian Journal of Forestry Research Vol 5, No 2 (2008): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ANATOMICAL PROPERTIES AND FIBER DIMENSION OF PRICKLY ACACIA (Acacia nilotica L.) FROM BALURAN NATIONAL PARK Krisdianto, Krisdianto; Damayanti, Ratih
Indonesian Journal of Forestry Research Vol 4, No 2 (2007): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Acacia nilotica (L.) Willd. ex. Delile growing in Baluran National Park has dramatically altered the ecological balance of grasslands and thereby threatens the existence of local biodiversity. Prickly acacia is able to spread rapidly and remains uncontrollable. Baluran National Park authorization has been struggling to control this prickly acacia trees. One possible action that can be taken to encounter this problem is allowing wood based industries, and local people take advantages of this nilotica timber utilization. This paper studies the anatomical properties and fiber dimensions of nilotica timber and discusses the possible utilization of  nilotica timber.   This timber is characterized by dark brown heartwood which is clearly distinct from reddish brown color of sapwood. The denser cell wall shows attractively streaked in tangential surfaces. The length of  wood fiber decreases from pith toward periphery portion. Longitudinally, higher stem has shorter fiber. Nilotica wood has second class quality of fiber, which means its fiber is moderately thick with narrow lumen diameter. Due to small log diameter and branches, the nilotica timber is not recommended for construction material. The timber is suitable for carved and turnery products. Nilotica timber is suitable for charcoal manufacture and fuel wood due to its high calorific value.
COLOR DIFFERENCES OF PINE AND EUCALYPT WOODS MEASURED BY MICROFLASH-200® Krisdianto, Krisdianto
Indonesian Journal of Forestry Research Vol 4, No 2 (2007): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

It is not easy to define color because it refers to psychological response of human. As a result, perception of color achieved by people is relatively different.  Wood color plays an important role in timber processing and it is an important consideration in wood identification. Each wood species has specific color and it becomes the species characteristic. Colors in wood are highly variable and unique features. Characteristics of wood color are influenced by extractive materials and moisture contents present on it. A standard of color measurement has been developed and it is called CIE model. The standard was developed to be completely independent of any devices and was based as closely as possible on human observation in color. CIELAB system is one of the simplest and most practical color measurement methods. The system has been used in one of the color measurement devices developed by Data Color International that is Microflash-200®. This research was aimed at translating interpretation of wood color by human eye into mathematical values so that scientific measurement of wood color can be studied. The measured wood color were 10 species of pines and 10 species of eucalypts woods in dry condition. The results showed that the two groups had different average of L*, a* and b* values. The average of L* for pine was 70.77, while eucalypt group made up to 52.40. It means that eucalypt group is darker than pine group. For a* value, pine group mean value is 20.23, whereas eucalypt group touches 19.11. In other words, pine and eucalypt group have an approximately similar redness. The b* value average for pine and eucalypt groups are 43.40 and 29.07, respectively. This value means that pine group is more yellow than eucalypt group.
VARIASI KEASAMAN DAN KAPASITAS PENYANGGA KAYU TAMPUI BERAS (Baccaurea macrocarpa (Miq.) Muell.Arg.) dan MANGGIS HUTAN (Garcinia cornea Miq.) Krisdianto, Krisdianto
Jurnal Penelitian Hasil Hutan Vol 31, No 4 (2013):
Publisher : Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2540.923 KB)

Abstract

Keasaman kayu adalah faktor penting yang mempengaruhi pengkaratan besi yang digunakan pada kayu dan kualitas perekatannya. Keasaman kayu tidak hanya bervariasi dalam jenis kayu, namun juga di berbagai lokasi dalam satu pohon. Tulisan ini mempelajari nilai pH dan kapasitas penyangga asam dan basa pada berbagai lokasi dalam pohon, dari dua jenis  kayu andalan Riau, yaitu tampui beras (Baccaurea macrocarpa (Miq.) Muell. Arg.) dan manggis hutan (Garcinia cornea Miq.). Pengukuran pH dilakukan dengan pH meter pada larutan hasil ekstraksi serbuk gergaji dalam air panas, sedangkan kapasitas penyangga diukur dengan cara titrasi asam dan basa kuat. Hasilnya menunjukkan bahwa rata-rata nilai pH kayu tampui beras adalah 5,2, lebih asam dari kayu manggis hutan dengan nilai pH 6,3. Kedua jenis kayu bersifat asam dengan pH kurang dari 7. Berdasarkan ketinggian pohon bagian pangkal lebih asam dari bagian tengah dan ujungnya, sedangkan berdasarkan potongan melintang nilai pH di bagian gubal lebih tinggi daripada di bagian terasnya. Kapasitas penyangga asam lebih tinggi dari kapasitas penyangga basanya.
ANALISIS HASIL PENGUJIAN KAYU YANG DISERANG PENGGEREK KAYU DI LAUT DENGAN INTERPRETASI GAMBAR DIGITAL Krisdianto, Krisdianto; Dewi, Listya Mustika; Muslich, Mohammad
Jurnal Penelitian Hasil Hutan Vol 33, No 1 (2015): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Keawetan kayu alami dinilai berdasarkan ketahanannya terhadap organisme perusak tertentu. Pengujian ketahanan alami kayu terhadap organisme perusak di laut dilakukan dengan membenamkan contoh kayu di perairan laut terbuka. Setelah enam bulan, kayu dinilai intensitas kerusakannya dan diklasifikasikan kelas ketahanannya terhadap serangan penggerek di laut. Penilaian kerusakan kayu dilakukan dengan interpretasi gambar digital. Tulisan ini mempelajari ketahanan alami sembilan jenis kayu dari Sumatera, Jawa dan Kalimantan terhadap organisme penggerek laut dengan perangkat lunak Image-J setelah enam bulan. Hasil pengujian kayu di perairan terbuka menunjukkan kayu sempur lilin (Michelia champaca L.var. pubinervia) dan kayu bawang (Azadirachta excelsa) (Jack) Jacobs) termasuk kelas ketahanan I (sangat tahan), sedangkan kayu cangcaratan (Lithocarpus sundaicus(Blume) Rehd., aveang kelalai (Shorea pervistipulata ssp. albifolia) termasuk kelas ketahanan II (tahan) terhadap penggerek kayu di laut. Kayu ki pasang (Prunus javanica Miq.) dan segelam (Hopea rudiformis) termasuk kelas ketahanan III (agak tahan) terhadap penggerek kayu di laut, sedangkan kayu ki bugang (Arthophyllum diversifolium Blume) dan ki langir (Otophora spectabilis Blume) termasuk kelas ketahanan V (sangat tidak tahan) terhadap penggerek kayu di laut. Pengukuran persentase kerusakan kayu dapat dilakukan dengan akurasi tinggi menggunakan metode gambar digital daripada cara konvensional. Pengukuran persentase kerusakan kayu dengan gambar digital menghasilkan nilai lebih tinggi karena bekas lubang tali. Namun, bekas lubang tali juga diperhitungkan sebagai kerusakan kayu. Untuk memperoleh pengukuran kerusakan yang tinggi, maka metode gambar digital dimodifikasi dengan menutup bagian lubang bekas tali dengan kesan yang sama dengan bagian disekitarnya.
PENGARUH ASETILASI TERHADAP PENYERAPAN UAP AIR PADA DUA JENIS KAYU TROPIS Krisdianto, Krisdianto
Jurnal Penelitian Hasil Hutan Vol 30, No 2 (2012):
Publisher : Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1703.254 KB)

Abstract

Proses asetilasi bertujuan mensubstitusi gugus hidroksil dalam kayu dengan gugus asetil. Dengan meningkatnya gugus asetil dalam kayu diharapkan mampu mengurangi kemampuan kayu menyerap molekul air sehingga dimensi kayunya menjadi lebih stabil. Penelitian ini bertujuan mempelajari penyerapan uap air pada kayu yang sudah diasetilasi. Studi dilakukan terhadap dua jenis kayu tropis yaitu: Anthocephalus chinensis dan Calophyllum sp. Pengujian penyerapan uap air dilakukan dengan metode isotherm menggunakan desikator dan larutan yang memiliki sifat higroskopis. Hasilnya menunjukkan bahwa kayu Anthocephalus yang diasetilasi secara efektif mampu mengurangi penyerapan uap air walaupun pada tingkat penambahan berat yang paling rendah. Pada kayu Calophyllum sp. penyerapan uap air berkurang secara nyata pada penambahan berat 10%. Penyerapan uap air bervariasi tergantung dari kelembaban kondisi pengujian dan membentuk model sigmoid dari kelembaban terendah (11%) sampai tertinggi (97%).
PENGUJIAN KETAHANAN BILAH BAMBU Petung (Dendrocalamus asper) (Schults f.) Backer ex Heyne) TERHADAP JAMUR DENGAN CARA HAMPARAN TANAH Krisdianto, Krisdianto
Jurnal Penelitian Hasil Hutan Vol 30, No 3 (2012):
Publisher : Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3322.776 KB)

Abstract

Keawetan merupakan salah satu aspek penting dalam penelitian sifat dasar bambu. Sebagai bahan berlignoselulosa alami, bambu mudah diserang organisme perusak termasuk jamur. Pengujian ketahanan bambu terhadap organisme perusak pada umumnya mengikuti metode laboratorium yang telah diterapkan pada kayu, seperti penggunaan bacto agar. Pengujian dengan hamparan tanah merupakan salah satu alternatif untuk menguji ketahanan bambu terhadap jamur, karena metode ini murah dan mudah dilakukan. Tulisan ini mempelajari cara pengujian keawetan bilah bambu dengan metode hamparan tanah. Contoh uji bilah bambu diambil dari bagian dalam (i), tengah (m) dan luar (o) dan bagian pangkal (B) , tengah (M) dan ujung (T). Hasilnya menunjukkan bilah bambu dari bagian dalam (i) lebihmudah diserang jamur dari bagian tengah (m) dan luar (o). Setelah enam bulan, contoh uji dari bagian dalam gagal dalam uji tusuk dan uji patah dengan tangan, sedangkan bilah dari bagian tengah gagal setelah delapan bulan pengujian. Contoh uji yang diuji dengan kemampuan tanah menahan air 100% lebihmudah terserang jamur daripada contoh uji yang ditanam pada tanah yang mampu menahan air 80%. Bilah bambu dari bagian bawah (B) lebih tahan terhadap serangan jamur dari bagian tengah (M) dan atas (T), namun perbedaannya kurang nyata. Pada umumnya pengujian bilah bambu dengan hamparan tanah dapat dijadikan metode pengujian alternatif untuk menentukan keawetan bilah bambu terhadap jamur.
PERBANDINGAN PERSENTASE VOLUME TERAS KAYU JATI CEPAT TUMBUH DAN KONVENSIONAL UMUR 7 TAHUN ASAL PENAJAM, KALIMANTAN TIMUR Krisdianto, Krisdianto; Sumarni, Ginuk
Jurnal Penelitian Hasil Hutan Vol 24, No 5 (2006): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6746.24 KB) | DOI: 10.20886/jphh.2006.24.5.385-394

Abstract

Kayu jati (Tectona grandis L.f.) telah dikenal sebagai bahan baku mebel dan konstruksi dengan kualitas tinggi. Jati cepat tumbuh atau dikenal dengan nama dagang 'Jati super', 'Jati unggul', 'Jati prima' atau 'Jati emas' merupakan tanaman jati yang dikembangkan melalui kultur jaringan dan bertujuan menambah pasokan bahan baku kayu jati. Sedangkan kayu jati konvensional merupakan tanaman yang dikembangkan melalui perkecambahan biji. Informasi mengenai kualitas kayu jati cepat tumbuh belum diketahui. Salah satu parameter kualitas kayu jati dapat dilihat dari persentase kayu terasnya dalam batang. Penelitian ini bertujuan membandingkan persentase teras kayu jati super dan konvensional pada umur dan lokasi yang sama. Hasil pengamatan menunjukkan bahwa pada umur 7 tahun, kayu teras telah terbentuk pada seluruh lempengan kayu jati super maupun konvensional dari bagian ujung, tengah dan pangkal. Persentase kayu teras jati super rata-rata 39,6%, lebih besar dari jati konvensional 20,3%. Berdasarkan persentase kayu terasnya kayu jati konvensional lebih baik dari jati super. Namun, parameter kualitas kayu yang lain juga harus diperhatikan seperti kualitas serat, kandungan bahan kimia dan keawetan alaminya. Berdasarkan SNI 01-5007.1-2003, batang kayu jati super dan konvensional pada umur 7 tahun dapat masuk dalam kriteria kayu bulat kecil (KBK, A.I.).
ANALISA KUALITAS AIR SUMUR GALI DI KOTA BANJARBARU PROVINSI KALIMANTAN SELATAN Anisyah, Anisyah; Mashuri, Adrias; Haris, Abdul; Krisdianto, Krisdianto
EnviroScienteae Vol 9, No 1 (2013): EnviroScienteae Volume 9 Nomor 1, April 2013
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (77.299 KB) | DOI: 10.20527/es.v9i1.1980

Abstract

Water is very important for the livelihood of humans, animals and plants. With the increasing population growth, especially in densely populated urban areas, the need for water also increases, while the source of clean water that meets health requirements increasingly difficult obtained. One of the most commonly used is to dig the wells, but the dug wells easily contaminated. This study aims to: (1) Knowing the quality of dug well water from the parameters of physical, chemical and bacteriological in Banjarbaru City. (2) Knowing the factors that affect water quality of dug wells in Banjarbaru City. The method  Purposive sampling  of certain places which is considered important has been used in this study. Sampling was carried out by several criteria that have representation from dug wells, then in each sub-sample is selected so that the number of samples for the five districts are 20 samples. The analysis of dug well water based on the parameters of physics, chemistry and bacteriology.  From the results of laboratory tests of the twenty selected sample representing the five districts in Banjarbaru City, it show that the condition of dug well water, based on Ministerial Decree of Environment (KEPMEN L.H) No. 115 year of 2003, the overall status of water quality of dug wells as follows: six sites meet  on standart water quality (Good), ten light polluted, two locations are being polluted and two sites heavily polluted. Based on the analysis of data on the five study sites, it can be concluded that the water quality of dug wells in Banjarbaru is less fit for use as a quality standard for clean water has exceeded the threshold value of the raw water quality class I defined Minister of Health (PERMENKES) RI No. 416 / MENKES/PER/IX/1990 about Water Quality Requirements List. The need for attention to areas that have the potential for contamination of dug well water for the management and quality control measures water of dug wells consumed by the public.
COLOR DIFFERENCES OF PINE AND EUCALYPT WOODS MEASURED BY MICROFLASH-200® Krisdianto, Krisdianto
Indonesian Journal of Forestry Research Vol 4, No 2 (2007): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2007.4.2.83-91

Abstract

It is not easy to define color because it refers to psychological response of human. As a result, perception of color achieved by people is relatively different.  Wood color plays an important role in timber processing and it is an important consideration in wood identification. Each wood species has specific color and it becomes the species characteristic. Colors in wood are highly variable and unique features. Characteristics of wood color are influenced by extractive materials and moisture contents present on it. A standard of color measurement has been developed and it is called CIE model. The standard was developed to be completely independent of any devices and was based as closely as possible on human observation in color. CIELAB system is one of the simplest and most practical color measurement methods. The system has been used in one of the color measurement devices developed by Data Color International that is Microflash-200®. This research was aimed at translating interpretation of wood color by human eye into mathematical values so that scientific measurement of wood color can be studied. The measured wood color were 10 species of pines and 10 species of eucalypts woods in dry condition. The results showed that the two groups had different average of L*, a* and b* values. The average of L* for pine was 70.77, while eucalypt group made up to 52.40. It means that eucalypt group is darker than pine group. For a* value, pine group mean value is 20.23, whereas eucalypt group touches 19.11. In other words, pine and eucalypt group have an approximately similar redness. The b* value average for pine and eucalypt groups are 43.40 and 29.07, respectively. This value means that pine group is more yellow than eucalypt group.