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All Journal FORESTA Jurnal Serambi Engineering Journal of Sylva Indonesiana
Achmad Siddik Thoha
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Engineering Environmental Science

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Fungsi Hidrologi Kebun Karet (Hevea brasiliensis Muell. Arg) dalam Mereduksi Besaran Curah Hujan Bersih (Hydrological Function of Rubber Plantation (Hevea brasiliensis Muell. Arg) to Reducing the Magnitude of Net Rainfall) Bejo Slamet; Achmad Siddik Thoha; Riki Jaya Dinata
FORESTA Vol 1, No 2 (2012): Indonesian Journal Of Forestry Volume 1 No. 2 (Juli 2012)
Publisher : FORESTA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (724.796 KB)

Abstract

Forest conversion resulted in loss of various forest functions, mainly the hydrological function changes. Mostly of the conversion of forests were to be oil palm and rubber plantations. Rubber plantation although an artificial ecosystem but had the similarity to forest condition. The purpose of this research was to examine the role of rubber plantation to reducing net rainfall that reached the plantation ground through the interception loss mechanism. Water volume balance was used to measure the interception loss.The results showed that the interception on the rubber plantation increased with the increasing of rubber age. Through fall tend to decreased with the increasing of rubber age were 60.56%, 53.62% and 43.79% of the total precipitation for 10 years, 15 years and 25 years of age respectively during the research period. The percentage of stem flow was 5.98% 7.94%, and 4.39% of total precipitation for 10 years, 15 years and 25 years of age respectively. The percentage of interception on rubber plantation for 10 years, 15 years and 25 years were 331.76 mm (19.6%), 428.73 mm (25.3%), and 545.79 mm (51.81%) of the total rainfall (1053.3 mm) respectively. Rubber plantation had good potency to reducing the net rainfall that reached the ground. This condition also informed that rubber plantation could reduce the risk of floods occurrence.Key words: rubber plantation, net rainfall, interception, through fall, stem flow
Analisis Kesesuaian Lahan Permukiman Menggunakan Sistem Informasi Geografis Di Kota Binjai Geniusmaniat Laia; Zulkifli Nasution; Achmad Siddik Thoha
Jurnal Serambi Engineering Vol 5, No 2 (2020)
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v5i2.1919

Abstract

A determination location for residential areas was influenced by physical factors, accessibility, socioeconomics, existing land use conditions, etc. Binjai is a municipality that has the highest population growth and resulting in the development of settlement highest growth. It is necessary to analyze land suitability for settlement development that provides appropriate residential location direction to realize productive and effective land use by utilizing Geographic Information Technology (GIS). This study aims to analyze residential development direction in Binjai as well as determine potential location into a residential area by considering carrying land capacity, land use effectiveness, and productivity. The suitability land capacity analysis for settlements development results: Very High (ST) 2,616.12 Ha, High (T) 4,295.65 Ha, Medium (S) 2,332.15 Ha, Low (R) 465.67 Ha, and Very Low (SR) 65.16 Ha. Suitability effectiveness analysis for settlements development results: Very High (ST) 4,560.08 Ha, High (T) 2,636.54 Ha, Medium (S) 1,533.04 Ha, Low (R) 417.36 Ha, and Very Low (SR) 167.65 Ha. Conformity analysis productivity utilization for settlements development results; Very High (ST) 4,216.52 Ha, High (T) 2,036.35 Ha, Medium (S) 1,249.72 Ha, Low (R) 1,122.23 Ha, and Very Low (SR) 451.52 Ha.
Analisis Daerah Rawan Bencana Tsunami Terhadap Pemanfaatan Lahan Perumahan dan Permukiman Kota Gunungsitoli Berbasis Geospasial Junalisman Harefa; Zulkifli Zulkifli; Achmad Siddik Thoha
Jurnal Serambi Engineering Vol 5, No 1 (2020)
Publisher : Fakultas Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32672/jse.v5i1.1654

Abstract

Land-use pattern of Gunungsitoli municipality cannot be controlled yet, where land originally designated for the Local Protection Zone or the coastal green zone has been converted to function as built-up land for housing and settlement activities. Spatial Planning Law Number 26/2007, Regional Regulation No. 12/2012, and Presidential Regulation Number 51/2016 in Article (1) has regulated spatial layout and coastline. Research type used in this research is descriptive research with a qualitative-quantitative approach. This study aims to predict population growth in 2020-2039, land changes in 2010-2019 and distribution of tsunami prone areas analysis. The results of this study predict population growth in Gunungsitoli municipality for the next 20 years, 2020-2039, to 148.341 people. The biggest land use change / change analysis occurred in Gunungsitoli sub-district with a percentage of 25,38% of the total area of change in all Gunungsitoli sub-districts, and the smallest land use change’s percentage that occurred in Gunungsitoli West sub-district because this sub-district has a sloping and bumpy topography. The results of the tsunami disaster area analysis showed Gunungsitoli sub-district is the most extensive vulnerability impacted of 3.449 hectares. Subsequently followed by Gunungsitoli Idanoi sub-district, South Gunungsitoli sub-district and North Gunungsitoli sub-district.
Mapping of Degraded Soil Properties in Gunung Leuser National Park Paranita Asnur; Achmad Siddik Thoha; Deni Elfiati
Journal of Sylva Indonesiana Vol. 2 No. 02 (2019): Journal of Sylva Indonesiana
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1206.068 KB) | DOI: 10.32734/jsi.v2i2.994

Abstract

Deforestation that occurs causes a decrease in soil fertility. Knowing soil fertility in the landscape will provide information on land management. The nature of the soil differs from one point to another, therefore it is necessary to map the properties of the soil. The purpose of this study is to map the distribution of the properties of forest land in areas that have been degraded. The land is a former privately-owned oil palm plantation in the Gunung Leuser National Park (TNGL) forest. The study uses a continuous grid interpolation method, thus forming polygons of soil properties. The soil types are Inseptisol an Ultisol. The results of the study show that most of them belong to the type of soil that is finely textured so that erosion can easily occur if surface runoff occurs in areas that have been exposed. The soil water content range that has the widest area is the range 26.98 - 29.50% with an area of 14.38 ha (42.91% of the research area). The range of land capacity has the widest area, namely the range 42.24 - 49.32% with an area of 13.32 ha (39.76% of the research area). Low organic matter content and acidic soil pH. Based on the results of these studies, the land in the research area is less fertile. However, restoration efforts are very possible because many tree species are adaptive with low soil fertility.
Co-Authors Bejo Slamet Deni Elfiati Geniusmaniat Laia Junalisman Harefa Paranita Asnur Riki Jaya Dinata Zulkifli Nasution Zulkifli Zulkifli