Articles

Found 23 Documents
Search

Dampak Perambahan Hutan Taman Nasional Lore Lindu Terhadap Fungsi Hidrologi Dan Beban Erosi (Studi Kasus Daerah Aliran Sungai Nopu Hulu, Sulawesi Tengah) Hidayat, Yayat; Sinukaban, Naik; Pawitan, Hidayat; Tarigan, Suria Darma
Jurnal Ilmu Pertanian Indonesia Vol 12, No 2 (2007): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (251.751 KB)

Abstract

The research was proposed to identify rainforest conversion impact on hydrologic function and soil erosion, and its simulation using ANSWERS model. Surface runoff and soil erosion were measured in soil erosion plots and outlet of Nopu Upper Catchment. Rainforest conversion to agricultural lands were significantly increased soil erosions and surface runoffs. Soil erosion from maize and peanut rotation was higher 2061.8% than natural forest. It higher value also in intercroping young age cocoa, maize and cassava and maize were 2023.8% and 2012.3% respectively. While surface runoffs increased up to 761.7°/o on bare plot, 567.5% on medium age cocoa, 446.8°/o on young age cocoa, 415.1°/o on intercroping young age cacao, maize and cassavas, 405.9°/o on old cocoa, and 329.5% on intercroping young age cacao and cassavas. Crop and management factor (C factor) value is significantly corelated with outputs of ANSWERS model. Using daily daily C factors, the ANSWERS model performs well in predicting soil erosion which is showed by determination coefficent (Jr = 0.89), model efficiency (0.86), and average of percentage model deviations (24.1%). Whereas using USlE C factor, model accuracy lower which represented by model coefficient (0.40) and average of percentage model deviations (63.6%). Using daily C factors, ANSWERS model simulation indicates rainforest conversion into agricultural lands on Nopu Upper Catchment has caused soil and water loss 3190.5 ton/year and 115441.0 m3/year, respectively. Agroforestry system practices in agricultural lands which in line with reforestation in stream line and steep agricultural areas (slope> 40°/o) was effective to reduce soil erosions up to 77.6°/o.
Soil Moisture Characteristics on Several Soil Types Baskoro, Dwi Putro Tejo; Tarigan, Suria Darma
Jurnal Ilmu Tanah & Lingkungan Vol 9, No 2 (2007): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Jurnal Ilmu Tanah & Lingkungan

Show Abstract | Original Source | Check in Google Scholar | Full PDF (334.671 KB)

Abstract

Soil water availability is one of the important factors injluencing plant growth. Soil that can store more water in alonger time can support a better plant growth. This study was aimed to evaluate the dynamics of soil water of four differentsoils with different characteristics. Four soils classes are clayey textured soils-Red Yellowish Podsolik Jasinga, Clayeytextured soils-Latosol Darmaga, . Sandy Textured soil-Regosol Sindang Barang, and highly organic mater content soi/sAndosolSukamantri. The result showed that at every-suction analyzed, Andosol Sukamantri had consistently highest watercontent while Regosol Sindang Barang was consistently lowest. Similar tendency wasfoundfor available water capacity. Theresult also showed that moisture content at Regosol decrease more rapidly than those of the other three soils. The time need to reach likely constant moisture content is variable with soil type; lowest at Regosol Sindangbarang (45 hours after completely saturated and drained) followed by Podsolik Jasinga (73 hours), Latosol darmaga (74 hours) and Andosol Sulcamatri (76 hours).
Analysis of Bekasi City Flood Reduction Using Watershed Management Kadri, Trihono; Sinukaban, Naik; Pawitan, Hidayat; Tarigan, Suria Darma
Forum Pasca Sarjana Vol 34, No 1 (2011): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

Show Abstract | Original Source | Check in Google Scholar | Full PDF (581.633 KB)

Abstract

One major river flowing through Bekasi City is Bekasi river. Total extent of the Bekasi watershed is about 39.045 ha, in 2002 with rainfall of 250 mm for 8 hours caused about 138 ha flooded in residents area for 2-3 days in Bekasi City, more extremely in 2005 with rainfall only 127 mm  for 6 hours caused about 164 ha flooded in residents area for 3 days.  This evidence showed that flood problem in Bekasi City is become worse, and seem to be more horrifying in the future. Therefore, the flood problem needs an extremely great attention.  The objectives of the research is (1) analysis watershed condition; (2) analysis of the causes of flood over Bekasi City from the perpective of hydrology and hydraulic; (3) plan of Bekasi watershed management to reduce flood risk in Bekasi City.  To obtain the purposes of this research, the method of analysis is devided into four main subjects: (1) analysis of watershed condition using SCS method; (2) hydrology analysis using hydrology modeling HEC-HMS; (3) river flow capacity using hydraulic modeling HEC-RAS and (4) plan of scenarios to reduce flood risk.  There are four scenarios to overcome the flood problems: (1) similarly with government plan 2010;(2) managing Bekasi watershed area with conservation tillage; (3) build water retarded structure entire of  watershed and;(4) combination of second and third scenarios.  The research results shown that river flow capacity only 462 m3/s is not enough to flow the discharges, otherwise the land use is change and increasing the run off in upstream.  Based on the problems, it is expected to overcome the flood problem by managing Bekasi watershed area with conservation tillage and build water retarded structure.  It will reduce 28.58% of the discharge run off in 2020.   Key words: flood, land use changing, watershed management
Pengelolaan Penggunaan Lahan untuk Stabilisasi Tepian Hutan Tropis Menggunakan Agent-Based Land-Use Modelling Tarigan, Suria Darma; Wiegand, Kerstin
Jurnal Ilmu Pertanian Indonesia Vol 17, No 2 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (308.281 KB)

Abstract

Tropical forest margin conversion to agriculture land in in Lore Lindu National Park has reached an alaming rate. The conversion was trigered by insufficient revenue to support minimal living standard amounted to                  Rp15.000.000,00/year/household obtained from unproductive cacao farming. Each household required another 1 ha new land to at least reach that minimal living standard. Therefore 218 ha of forest land are potentially cleared by farmerin the near future to extend their farming area. Increasing productivity using innovative agro-technolgy should be considered as one important alternative to reduce the need to clear another forest area. Due to the complexity of interrelated variable affected by using innovative agro-technolgy, a model should be used to take account every affected variable such as availability of labour and liquidity in adopting new agro-technology. In this research, agent-based modeling with mixed integer linear programming model (MILP) using MPMAS software (Mathematical Programming for Multy Agent System) was used to analyze impact of balanced fertilizing and irrigation technology to increase cacao land productivity. Balanced fertilizing was insufficient to reach minimum standard living of Rp15.000.000,00 with existing area of cacao land (1 ha/HH), due to the severe water deficit during month of January until February. Combining balanced fertilizing with irrigation water supply can increase productivity reaching minimum standard of living. It was obvious from the modeling that in the ealier period of cacao growth (1-5 year old), deficits in liquidity and labour was encountered. Interplanting cacao with maize at the earlier phase with additional income from livestock can alleviate liquidity shortage. Keywords: agent-based modeling, agro-technology, cacao farming system, forest conversion, standard income
KAJIAN DAMPAK PERUBAHAN PENGGUNAAN LAHAN TERHADAP DEBIT ALIRAN DAS CIUJUNG Sulaeman, Dede; Hidayat, Yayat; Rachman, Latief Mahir; Tarigan, Suria Darma
JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR Vol 4, No 2 (2014)
Publisher : JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR

Show Abstract | Original Source | Check in Google Scholar | Full PDF (542.907 KB)

Abstract

Ciujung Watershed is considered as one of major watershed in Banten Province related to floods that take place almost every year in the area. The study aims to assess landuse change and its influence on discharge. Watershed conditions such as precipitation, discharge, peak discharge, volume rate of discharge, and runoff were analyzed in two periods: 1999-2003 and 2004-2011. Landuse changes were analyzed in 8 years period (2003-2011) as well as its influence on discharge. Average annual precipitation in the period of 1999-2003 and 2004-2011 are 2370 and 2419 mm respectively. Average annual discharge in the period of 2004-2011 increased by 15% compared to the period of 1999-2003. Watershed conditions analysis indicates that Ciujung watershed quality decreased with increasing in surface runoff coefficient with values of 0.43 (period 1999-2003) and 0.48 (period 2004-2011). The study showed that there are several decreasing landuses during period 2003-2011 such as open land, natural forest, mixed dry land farming, secondary dry forest, primary dry forest, and dry land farming by 47.4; 14.3; 8.4; 2.9; 1.6 and 0.1% respectively. Several increasing land uses during the period including bush, plantations, settlements, and paddy field by 1,974.5; 5.5; 3.8 and 0.9% respectively. Keywords: discharge, land use change, peak discharge, runoff Ciujung Watershed is considered as one of major watershed in Banten Province related to floods that take place almost every year in the area. The study aims to assess landuse change and its influence on discharge. Watershed conditions such as precipitation, discharge, peak discharge, volume rate of discharge, and runoff were analyzed in two periods: 1999-2003 and 2004-2011. Landuse changes were analyzed in 8 years period (2003-2011) as well as its influence on discharge. Average annual precipitation in the period of 1999-2003 and 2004-2011 are 2370 and 2419 mm respectively. Average annual discharge in the period of 2004-2011 increased by 15% compared to the period of 1999-2003. Watershed conditions analysis indicates that Ciujung watershed quality decreased with increasing in surface runoff coefficient with values of 0.43 (period 1999-2003) and 0.48 (period 2004-2011). The study showed that there are several decreasing landuses during period 2003-2011 such as open land, natural forest, mixed dry land farming, secondary dry forest, primary dry forest, and dry land farming by 47.4; 14.3; 8.4; 2.9; 1.6 and 0.1% respectively. Several increasing land uses during the period including bush, plantations, settlements, and paddy field by 1,974.5; 5.5; 3.8 and 0.9% respectively. Keywords: discharge, land use change, peak discharge, runoff
Pengelolaan Penggunaan Lahan untuk Stabilisasi Tepian Hutan Tropis Menggunakan Agent-Based Land-Use Modelling Tarigan, Suria Darma; Wiegand, Kerstin
Jurnal Ilmu Pertanian Indonesia Vol 17, No 2 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (308.281 KB)

Abstract

Tropical forest margin conversion to agriculture land in in Lore Lindu National Park has reached an alaming rate. The conversion was trigered by insufficient revenue to support minimal living standard amounted to                  Rp15.000.000,00/year/household obtained from unproductive cacao farming. Each household required another 1 ha new land to at least reach that minimal living standard. Therefore 218 ha of forest land are potentially cleared by farmerin the near future to extend their farming area. Increasing productivity using innovative agro-technolgy should be considered as one important alternative to reduce the need to clear another forest area. Due to the complexity of interrelated variable affected by using innovative agro-technolgy, a model should be used to take account every affected variable such as availability of labour and liquidity in adopting new agro-technology. In this research, agent-based modeling with mixed integer linear programming model (MILP) using MPMAS software (Mathematical Programming for Multy Agent System) was used to analyze impact of balanced fertilizing and irrigation technology to increase cacao land productivity. Balanced fertilizing was insufficient to reach minimum standard living of Rp15.000.000,00 with existing area of cacao land (1 ha/HH), due to the severe water deficit during month of January until February. Combining balanced fertilizing with irrigation water supply can increase productivity reaching minimum standard of living. It was obvious from the modeling that in the ealier period of cacao growth (1-5 year old), deficits in liquidity and labour was encountered. Interplanting cacao with maize at the earlier phase with additional income from livestock can alleviate liquidity shortage.
Dampak Perambahan Hutan Taman Nasional Lore Lindu Terhadap Fungsi Hidrologi Dan Beban Erosi (Studi Kasus Daerah Aliran Sungai Nopu Hulu, Sulawesi Tengah) Hidayat, Yayat; Sinukaban, Naik; Pawitan, Hidayat; Tarigan, Suria Darma
Jurnal Ilmu Pertanian Indonesia Vol 12, No 2 (2007): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Original Source | Check in Google Scholar | Full PDF (251.751 KB)

Abstract

The research was proposed to identify rainforest conversion impact on hydrologic function and soil erosion, and its simulation using ANSWERS model. Surface runoff and soil erosion were measured in soil erosion plots and outlet of Nopu Upper Catchment. Rainforest conversion to agricultural lands were significantly increased soil erosions and surface runoffs. Soil erosion from maize and peanut rotation was higher 2061.8% than natural forest. It higher value also in intercroping young age cocoa, maize and cassava and maize were 2023.8% and 2012.3% respectively. While surface runoffs increased up to 761.7°/o on bare plot, 567.5% on medium age cocoa, 446.8°/o on young age cocoa, 415.1°/o on intercroping young age cacao, maize and cassavas, 405.9°/o on old cocoa, and 329.5% on intercroping young age cacao and cassavas. Crop and management factor (C factor) value is significantly corelated with outputs of ANSWERS model. Using daily daily C factors, the ANSWERS model performs well in predicting soil erosion which is showed by determination coefficent (Jr = 0.89), model efficiency (0.86), and average of percentage model deviations (24.1%). Whereas using USlE C factor, model accuracy lower which represented by model coefficient (0.40) and average of percentage model deviations (63.6%). Using daily C factors, ANSWERS model simulation indicates rainforest conversion into agricultural lands on Nopu Upper Catchment has caused soil and water loss 3190.5 ton/year and 115441.0 m3/year, respectively. Agroforestry system practices in agricultural lands which in line with reforestation in stream line and steep agricultural areas (slope> 40°/o) was effective to reduce soil erosions up to 77.6°/o.
ANALISIS RESPON HIDROLOGI TERHADAP PENERAPAN TEKNIK KONSERVASI TANAH DI SUB DAS LENGKONG MENGGUNAKAN MODEL SWAT Firdaus, Gunadi; Haridjaja, Oteng; Tarigan, Suria Darma
Jurnal Ilmu Tanah dan Lingkungan Vol 16, No 1 (2014)
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Original Source | Check in Google Scholar | Full PDF (860.332 KB)

Abstract

Salah satu penyebab banjir dan erosi adalah kondisi biofisik di bagian hulu Daerah Aliran Sungai (DAS) yang sudah tidak dapat mendukung fungsi hidrologis DAS. Perlu dilakukan upaya-upaya penerapan teknik konservasi tanah yang tepat untuk memperbaiki fungsi hidrologis DAS tersebut. Penelitian ini bertujuan untuk: (1) menganalisis respon hidrologi berdasarkan kondisi biofisik DAS pada tingkat analisis skala meso, dan (2) menganalisis respon hidrologi berdasarkan penerapan skenario teknik konservasi tanah. Wilayah kajian untuk penelitian adalah di sub DAS Lengkong yang terletak di bagian hulu DAS Cisadane seluas 1,788 ha. Penelitian ini dilakukan dengan menggunakan pemodelan hidrologi Soil and Water Assessment Tool (SWAT). Hasil analisis respon hidrologi terhadap penerapan skenario konservasi tanah menunjukkan Koefisien Regim Sungai sebesar 149.71 untuk skenario 1 (penanaman tanaman strip) dan 2 (penanaman pohon mengikuti kontur), sebesar 149.80 untuk skenario 3 (pembuatan teras), sebesar 150.25 untuk skenario 4 (gabungan skenario 1 dan 2), dan sebesar 149.31 untuk skenario 5 (gabungan skenario 1, 2 dan 3). Berdasarkan nisbah erosi potensial dengan erosi yang dapat ditoleransi, diperoleh indeks bahaya erosi untuk skenario 1 sebesar 2.63 (sedang), skenario 2 sebesar 2.57 (sedang), skenario 3 sebesar 0.60 (rendah), skenario 4 sebesar 2.45 (sedang), dan skenario 5 sebesar 0.44 (rendah). Penerapan teknik konservasi tanah yang mengkombinasikan penanaman pohon mengikuti kontur dan penanaman tanaman strip dengan pembuatan teras secara bersamaan, merupakan teknik konservasi tanah yang terbaik untuk memperbaiki respon hidrologi DAS, sehingga dapat direkomendasikan untuk diterapkan di sub DAS Lengkong pada khususnya, dan di DAS Cisadane bagian hulu pada umumnya.
KARAKTERISTIK HANTARAN HIDROLIK JENUH TANAH PADA PERKEBUNAN KELAPA SAWIT, PTPN VII LAMPUNG SELATAN Syahadat, Pungkas; Tarigan, Suria Darma; Murtilaksono, Kukuh
Jurnal Ilmu Tanah dan Lingkungan Vol 13, No 2 (2011): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Original Source | Check in Google Scholar | Full PDF (168.536 KB)

Abstract

Kelapa sawit (Elais guineensis Jacq.) merupakan salah satu tanaman yang memerlukan air dalam jumlah yang banyak. Ketersediaan air merupakan salah satu faktor pembatas utama bagi produksi kelapa sawit. Pada musim kemarau kelapa sawit akan mengandalkan cadangan air bawah tanah untuk kebutuhan airnya. Hantaran hidrolik merupakan parameter sifat fisik tanah yang berperan dalam penambahan air bawah tanah. Tujuan dilakukannya penelitian ini adalah mengetahui karakteristik hantaran hidrolik jenuh pada berbagai jenis lokasi yang meliputi gawangan mati, piringan, dan jalan pikul pada perkebunan kelapa sawit PTPN VII Lampung. Karakteristik ini dapat dijadikan acuan pengelolaan lahan agar dapat meningkatkan cadangan air bawah tanah. Nilai hantaran hidrolik jenuh pada lokasi gawangan mati berkisar antara 2.9-30.4 cm jam-1 dengan kelas sedang sampai sangat cepat, pada lokasi piringan berkisar antara 2.5-13.4 cm jam-1 dengan kelas agak lambat sampai cepat, dan pada lokasi berupa jalan pikul nilai hantaran hidrolik jenuhnya berkisar antara 1.6-12.8 cm jam-1 yang berada pada kelas agak lambat sampai cepat. Tingginya hantaran hidrolik pada gawangan mati disebabkan terjaganya struktur tanah oleh tumpukan pelepah yang sudah mati. Hasil penelitian menunjukan bahwa aktifitas pemanenan yang intensif menurunkan nilai hantaran hidrolik jenuh tanah pada areal piringan dan jalan pikul tempat mengangkut hasil panen disebabkan peningkatan kepadatan tanah.
LAND CAPABILITY EVALUATION FOR LAND USE RECOMMENDATION IN LAWO WATERSHED Harjianto, Mahendra; Sinukaban, Naik; Tarigan, Suria Darma; Haridjaja, Oteng
Jurnal Penelitian Kehutanan Wallacea Vol 5, No 1 (2016): Jurnal Penelitian Kehutanan Wallacea
Publisher : Balai Penelitian dan Pengembangan Lingkungan Hidup dan Kehutanan Makassar

Show Abstract | Original Source | Check in Google Scholar

Abstract

The changes of forest uses into agricultural land is a serious problem in Lawo watershed, South Sulawesi. Agricultural practices without implementing soil conservation and adequate agro-technology has caused high level of soil erosion and low land productivity. Management in Lawo watershed must be done with integrated soil and water conservation in order to increase agricultural production. This effort can be done with land capability evaluation. The purpose of this study is to evaluate the land capability of Lawo watershed using land capability category for data analysis. The results showed that Lawo watershed is dominated by land capability of class III with erosion (middle) as the dominant limiting factor which covers about 17,476.42 ha (49.68%). In addition, the class of land capability is followed by class IV with the slope (moderately steep) as the limiting factor and erodibility of soil (middle) covering about 10,059.8 ha (28.6%), land capability of class VI with slope (Steep) as the limiting factor with 7,638.32 ha (21.72%) coverage area. Land with class III can be recommended for dryland farming with adequate application of agro-technology, and water and soil conservation. While class IV and VI are not recommended for agricultural activities but for private forest or plantation forest