Found 36 Documents

Respons Hidrologi Akibat Deforestasi di DAS Barito Hulu, Kalimantan Tengah

Publisher : Bogor Agricultural University

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The landcover change, particularly deforestation, can to affect of hydrological response on watershed.Deforestation of natural forest is identical to degradation of watershed functions, such as loos of land productivitydue to increased soil erosion, runoff, evapotranspiration, and decreased of water storage. The main objective ofthis study is describes the hydrologic response on the Barito Hulu watershed due to landcover change (particularlydeforestation) by the use Soil and Water Assessment Tool (SWAT) model. The result of the study showed thatdecreasing of forest area was 9.51% from initial condition can increase water yield, evapotranspiration, and erosion as much as 8.52%, 5.94%, and 1.73 t ha-1 year-1, respectively. Otherwise, water storage decreased as much as14.46%. The landcover on 1990 with rainfall 3,117.10 mm year-1 provided water yield of approximately 1,387.13 mm, evapotranspiration of 1,152.10 mm, water storage of 577.87 mm, and erosion of about 20.52 t ha-1 year-1. The landcover on 2003 with rainfall 2,613.2 mm year-1 provided water yield of approximately1,385.50 mm, evapotranspiration of 1,121.10 mm, water storage of 106.60 mm, and erosion of about 33.15 t ha-1 year-1 with erosion tolerance of about 43.57 t ha-1 year-1.Keywords: Barito Hulu watershed, land cover change, water yield, erosion, evapotranspiration


Jurnal Gizi dan Pangan Vol 6, No 1 (2011): Maret 2011
Publisher : Jurnal Gizi dan Pangan

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This research aims to analyze underlying factors affecting child malnutrition at Timor Tengah Utara district, NTT. The design was a cross-sectional study. Sample of this study was household that have underfive years old children residing in the areas of Plan International. Data was collected by using structured questionnaire, focus group discussion and in-depth interview. Nutritional status was measured using anthropometric measurement with weight and height indicators and child consumption was recorded using 24 hours food’s recall. Result showed that in three villages prevalence of malnourished children was high, which were 6.0% classified as severe underweight, 15.3% severe stunting and 0.7% severe wasting. There was no significant difference in term of nutritional status. Child malnutrition was influenced by low access to nutrition and health information, low nutrition knowledge and practices, and low family income. Key words: underfive children, nutritional status, Timor Tengah Utara

Dynamics of Soil Quality, Erosion and Income of Farmer as Effect of Forest Conversion into Cocoa Landuse in Nopu Watershed, Central Sulawesi

Forum Pasca Sarjana Vol 31, No 3 (2008): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Sustainable agriculture development requires a high quality and proper land management in order to promote high farmer’s income and to prevent natural  resources degradation. This research was conducted in Nopu sub-watershed, a sub sub Gumbasa watershed, Central Sulawesi Province. The erosion and surface run off were observed by placing erosion plots on various ages of cocoa land uses (monoculture and agroforestry), whiles the soil quality indicators were observed by analyzing the physical and chemical properties of soil samples, which were collected from various  ages of cocoa land use. The soil profile  permeability and soil surface coverage were directly observed on the field. Production and farmer’s income of various cocoa land use systems in Nopu watershed were collected by using questioners.  Sustainable management of cocoa (monoculture and agroforestry) was formulated by using various scenarios. Results of the study showed that 1) forest conversion into cocoa land use decreased soil quality degradation, tended to increase soil erosion and run off; 2) to establish a sustainable cocoa farming system in Nopu watershed, there should be practiced a proper and equilibrium fertilization, application of adequate soil and water conservation techniques such as mulching and construction of ditches closed (rorak) and  ridges (sengkedan).   Key words:  cocoa, erosion, farmer’s income, forest conversion, soil quality

Determining on Expectation of Reforestation Success Age at Mining Area, PT. INCO, Sorowako, South Sulawesi

Forum Pasca Sarjana Vol 33, No 4 (2010): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Land rehabilitation of post-mining must be done with reforestation. Reforestation success in post-mining revegetation should to refer the characteristics of natural forests.  The success of the reforestation is expected to reach a climax forest ecosystem.  How much time is needed to achieve the desired condition (success reforestation), in this case described as the age of achievement expectations of reforestation success to reach a climax forest ecosystem (the basalt area).  The research is aimed to predict reforestation success age.  The study used regression analysis for determining the reforestation success age in mining area.  The measure used to determining the reforestation success age is basalt area (LBDS) of natural forests.  Mathematically it can be summarized to LBDS = f (age).  The study found the age of achievement expectations of reforestation success is 75 years.  Over the 75 years when the efforts to improve, protect and enhance forest functions are be done well, consistently, and even continued to rise, certainly reforestation success will be achieved, or even faster.   Key words: rehabilitation, mining area, reforestation, basalt area, reforestation success age

Characteristic of Soil Physical Properties Derived from Pyritic-Contained Sediment of Musi Banyuasin as by Affected by Drying Treatment

Jurnal Ilmu Tanah & Lingkungan Vol 3, No 2 (2000): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Jurnal Ilmu Tanah & Lingkungan

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Greenhouse and laboratory research at the Department of Soil Science, Faculty of Agriculture IPB has been conducted about treatment of drying on acid sulphate soil coloum from Musi Banyuasin to examine the effect on soil physical properties. Soil coloum of 95 cm height is maintained submerged, aside from other soil coloums drained at 50 cm and 75 cm depth are drying treatment of 2, 4, 6, and 8 weeks. Drying treatment at 75 cm depth lowering soil surface 0.8 and 2.9 crn at the firstand eighth week of drying, respectively. The soil subsidence is affected by organic matter decomposition and swelling - shrinkage characteristic of 2:1 clay mineral. Drying treatmentsignificantly increasing aggregate stability from 54.69 to 57.19 at 15 cm depth, decreasing it from 57.29 to 51.19 at 45 cm depth at sixth week, and 49.59 to 45.82 at 75 cm depth at fourth week.Although the result has irregular pattern, drying treatment significantly increasing soil bulk density at 15 an depth from 0.83 to 0.95 glcm3, decpasing at 45 cm depth from 0.69 to 0.45 glcm3at sixth week, and increasing from 0.63 to 0.72 g/cm at 75 cm depth at fourth week. The incremental anddecreasing is more caused by organic matter decomposition and soil aggregate sementation by iron resulted from pyrite oxidation. Drying treatment significantly affecting soil porosity, permeability and COLE at several depth, atthough the pattern is irregular.

Pemantauan Keberhasilan Reforestasi di Kawasan Pertambangan Melalui Model Indeks Tanah (Reforestation Achievement Monitoring at Mining Area through Soil Index Model)

Publisher : Bogor Agricultural University

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The achievement of the reforestation is expected to reach a climax forest ecosystem. The objectives of this studywas to develop soil index model on monitoring of reforestation achievement. The study used a statistical approachto obtain soil index model to determine the achievement level of reforestation in mining area. The achievementindices for each variable were derived from the best regression model developed, while the weights of eachvariable were computed based on magnitude of regression coefficient for each indicator. The level of reforestationachievement index was initially developed by the use of 4 indicators, i.e. physical soil, biological soil, chemicalsoil, and litter index. Of those indicators, the study revealed that the heights weight for reforestation monitoringwas chemical soil, which is composed pH, cation exchange capacity (CEC), macro-micro nutrient, and basesaturation.

Analysis of Institution System on Planning and Strategy of Critical Land on Bila Watershed Management

Jurnal Penyuluhan Vol 3, No 2 (2007): Jurnal Penyuluhan
Publisher : IPB

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The rehabilitation program of critical land had been done since 1985 until 2001, but Bila watershed condition did not get better, even the width of critical land and erotion got more increase. Those were caused by some factors, involved: unaccruracy of technology, limited baudget, and unoptimal institution. Analysis of this study was focused on institution factor. Some of institution aspects that caused failure of rehabilitation of critical land Bila watershed, were is: role of institution sector, performance of management function, weakness on coordination, unrelevant of strategic program, and priority activity. Data collected was conducted by survey on some samples. Interpretative Structural Modelling and Analitycal Hierarchy Process were applied and the result shown that: (1) The main subject in critical land Bila watershed management were institution at regency level, which is Bappeda and Bapedalda, (2) unsuccess of rehabilitation of critical land Bila watershed was caused by planning weakness, (3) top-down policy, one of nine from main factors must be handled for effectiveness of coordination function, (4) to equalize vision and mission Bila watershed management cross territory was one of foor priority strategic frogram in critical land Bila watershed management, (5) and to increase knowledge and farmer skills were one of seven priority activity in critical land Bila watershed management.

Tropical Forest Landscape Fragmentation in Batang Toru Watershed, North Sumatra

Publisher : Bogor Agricultural University

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Timber-based forest management is now shifting to as broader scope including ecosystem-based management. Timber-oriented forest management frequently affects the fragmentation of forest landscape. This paper defines the degree of forest landscape fragmentation in Batang Toru watershed, North Sumatra through indentification of correlation between forest landscape fragmentation and driving factors including biophysical and anthropogenic factors. Identification structure, pattern, and fragmentation of forest landscape were performed using Landsat imageries acquired in 1989, 2001, and 2013. Forest and land cover classes were analyzed using FRAGSTAT 3.3 to generate landscape metrics. Fragmentation of forest landscape was identified using landscape metrics, i.e., area, patch density, number of patch, contiguity and proximity index.  The clumpiness index of landscape metrics describes the pattern of forest landscape, while the patch size proportions expressed structure of forest landscape.  This study found that forest landscapes located in downstream of the watershed show more fragmented than area in the upper stream, while the sub-watershed of Batang Toru Hilir is more clumped  than the others. This study concludes that (1) the forest landscape fragmentation tend to increase since 1989 to 2013; and (2) the degree of forest landscape fragmentation has close correlation with the distance to main road and river.Keywords: forest connectivity, ecosystem, deforestation, fragstat, fragmentation 

Pencirian Debit Aliran Sungai Citarum Hulu

Jurnal Ilmu Pertanian Indonesia Vol 18, No 2 (2013): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Citarum is one of strategic rivers in West Java. In the upper part of this river, there are 3 large dams (Saguling, Cirata, and Jatiluhur) which operates hydroelectric power that supply ± 20% electricity needs of Java-Bali area. Run off discharge of the river are fluctuating widely so greatly affect the performance of electricity production, supply of irrigation, and household water in the downstream area. The research aims to identify character of river discharge of Citarum Hulu and its relation with land use changes and farm management. River discharge were analyzed at the inlet of Saguling dam in Kampung Nanjung and some stream monitoring stations located in Ciwidey, Cisangkuy, and Cikapundung-Gandok. River discharge was highly fluctuating. In the peak of rainy season the flow rate can reach 578 m3/sec which caused flooding in several area such as Majalaya, Banjaran, and Dayeuhkolot. In contrary, in dry season the flow was very low, about 2.7 m3/sec, causing drought, failure of rice harvest, and reduced water supply to hydropower plant of Saguling. In addition to affecting rainfall patterns, the flow rate fluctuations was also influenced by pattern of land use and management. Land utilization that was not in accordance with the land capability was the main cause of land degradation which in turn would decrease hydrology function of watershed to control river discharge in rainy season. Keywords: citarum upper watershed, land capability, land use, river discharge


Jurnal Sains Dirgantara Vol. 10 No. 1 Desember 2012
Publisher : Lembaga Penerbangan dan Antariksa Nasional

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Sebagai bagian dari Cekungan Bandung, Situ Cileunca memegang peranan penting dalam memasok sumber air baku untuk penduduk Kabupaten dan Kota Bandung. Curah hujan di area Situ Cileunca memperlihatkan bentuk fungsi distribusi probabilitas logaritmik normal yang tak simetris dengan kurtosis berharga negatif. Sesuai dengan karakteristik data maka metode analisis deret waktu linear dan non-linear yang sesuai telah diterapkan untuk mendapatkan nilai statistik deskriptif, probabilitas, pemodelan dan prakiraan ke depan berbasis data curah hujan bulanan dari tahun 1993 sampai 2011 di atas Situ Cileunca Kabupaten Bandung. Data curah hujan bulanan terdiri dari 230 data dengan koefisien variabilitas sebesar 78%, sedangkan untuk pemodelan digunakan 200 data dalam rangka memperoleh parameter non-linear optimal. Langkah pertama, dicari waktu tunda dari keseluruhan data yang diterapkan dengan menggunakan metode autokorelasi dan informasi mutual yang menghasilkan waktu tunda 2, lalu dicari dimensi embedding secara iterasi. Diperoleh dimensi embedding 23 dengan koefisien korelasi 0,6 yang merupakan nilai paling besar dari 30 dimensi embedding yang dicoba. Dimensi embedding 23 merupakan batas atas dari jumlah variabel bebas yang cukup untuk pemodelan dinamika curah hujan.Kata kunci: Curah hujan, Non-linear, Statistik, Situ Cileunca Waktu tunda, Dimensi embedding