http://repository.ipb.ac.id/handle/123456789/5355 2026-07-12T05:37:05Z http://repository.ipb.ac.id/handle/123456789/173909 Impact Of Reducing And Increasing Shade Distance On The Natural Durability And Microfibril Angles Of Red Meranti Wood Wistara, I Ny. Jaya Red Meranti (Shorea leprosula Miq.), a significant species in the Dipterocarpaceae family, is widely distributed across Kalimantan and Sumatra in Indonesia. Its broad distribution and resilience make it a prime candidate for plantation forestry, with the potential to enhance both ecological sustainability and economic profitability in these areas (Effendi and Kurniawan, 2003). A notable characteristic of Red Meranti is its adaptability to a wide range of soil conditions, which promotes robust growth and makes it suitable for varied planting environments (Hendromono and Hajib, 2001). For the effective establishment and growth of Red Meranti plantations, a thorough understanding of silvicultural techniques is essential. Research indicates that optimized planting density significantly influences stem diameter growth in Red Meranti. Specifically, investigations by Mawazi and Suhaendi (2012) demonstrate that appropriate spacing not only supports healthy tree development but also maximizes overall timber yield. ... 2026-06-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/173908 Karakteristik Sifat Fisik Dan Dimensi Serat Dalam Proses Pembuatan Kertas Wistara, I Ny. Jaya Kualitas kertas sangat dipengaruhi oleh karakteristik serat pulp serta perlakuan yang diterapkan selama proses pembuatannya. Berbagai tahapan proses, terutama penggilingan (refining) dan pengeringan (drying), menyebabkan perubahan pada sifat fisik, kimia, dan morfologi serat yang selanjutnya menentukan kemampuan serat membentuk ikatan antarfiber serta sifat mekanik lembaran kertas (Walsh 2006). Pengeringan merupakan salah satu tahapan yang memberikan perubahan permanen terhadap struktur serat. Selama proses ini, penguapan air dari dinding sel menyebabkan terjadinya hornifikasi, yaitu kontraksi dinding sel yang diikuti penutupan pori-pori dan pembentukan ikatan hidrogen internal yang bersifat irreversibel. Fenomena tersebut mengurangi kemampuan serat untuk menyerap air dan mengembang kembali (swelling), sehingga menurunkan fleksibilitas serat dan potensi pembentukan ikatan antarfiber pada proses pembentukan lembaran berikutnya (Park 2006). Penurunan kemampuan mengembang akibat hornifikasi bahkan diduga telah dimulai sejak lembaran mengalami penurunan kadar air secara drastis pada bagian wire mesin kertas (Park 2006). Padahal, interaksi antara air dan serat selulosa merupakan faktor penting yang menentukan fleksibilitas serat serta luas bidang kontak antarfiber, yang pada akhirnya memengaruhi kekuatan kertas (Walsh 2006). ... 2026-06-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/173907 Durian Fruit Skin Pulp To Enhance The Strength Characteristics Of Recycled Pulp Derived From Printed Paper Heated Using A Laser Printer Wistara, I Ny. Jaya PKD was processed with soda at 20% AA, a liquor-to-wood ratio of 4:1, and 170°C for 4 hours without bleaching. SWL underwent heat treatment in the printer, was fed five times at 160°C, and was subsequently repulped. The mixture of PKD and SWL was prepared at weight/weight compositions of 100/0, 75/25, 50/50, 25/75, and 0/100, with three freeness levels: 300 CSF, 200 CSF, and 100 CSF. The dimensions and derivative values for KD predominantly fall into fiber quality class II, except for felting power, which is classified as class III. SWL is categorized in quality class III. The solubility levels of ethanol-benzene, holocellulose, lignin, and α-cellulose for KD are 23%, 65.39-67.28%, 16.34-18.17%, and 41.16-42.38%, respectively. In 1% NaOH, the solubility hierarchy is as follows: fiber KD > PKD 300 CSF > PKD 200 CSF > SWL. Notably, the mechanical properties of the sheet pulp mixture diminished as the composition of PKD increased, likely due to PKD’s higher content of low-molecular-weight polysaccharides and elevated cellulose degradation. In contrast, the mechanical properties of SWL can be enhanced through beating. 2026-06-01T00:00:00Z http://repository.ipb.ac.id/handle/123456789/173848 Growth Rate Of Red Jabon And Teak Trees From Plantation Forest Wahyudi, Imam; Rahayu, Istie Sekartining; Mpape, Bahidin Red jabon (Anthocephallus macrophyllus Roxb. Havil) and teak (Tectona grandis Linn. f) is fast- and slow-growing tree species that are widely planted in Indonesia. Both species have high adaptability to grow in various types of soils. The development of red jabon and teak plantation forests and the utilization of their wood produced require knowledge of their growth rates. The information on the growth rate is important because it is closely related to forest sustainability. Climatic elements such as rainfall, rainy day, temperature, humidity, and duration of irradiation are important factors in tree growth. The purpose of this study was to study the growth rate i.e. the annual increment of red jabon and teak trees and their relationship with climatic elements. Observations were made for one year, namely 2021. This study used descriptive analysis to describe the growth rate; while Pearson's correlation was used to evaluate the relationship between the growth rate and climate elements. The results showed that the diameter increment of the red jabon tree per year was 2.21 cm, while for teak was 0.34 cm per year. A significant relationship between the growth rate of the jabon tree and climatic elements can be seen in rainfall, rainy days, and humidity; while temperature and duration of irradiation did not have a significant correlation. In teak trees, a significant relationship was seen only on a rainy day and humidity; while rainfall, temperature and irradiation time are not significantly correlated. 2026-06-01T00:00:00Z