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All Journal Jurnal Kawistara : Jurnal Ilmiah Sosial dan Humaniora AGRIVITA, Journal of Agricultural Science Indonesian Journal of Geospatial JURNAL ILMIAH GEOMATIKA MAJALAH ILMIAH GLOBE
Wiwin Ambarwulan
Training and Education Division, Badan Informasi Geospasial (BIG)
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Education Mathematics

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DYNAMIC SYSTEM MODELLING AND LAND SUITABILITY TO DEFINE PRIORITY AREAS OF SOYBEAN PLANTATION IN PADDY FIELDS IN KARAWANG, WEST JAVA Widiatmaka, Widiatmaka; Ambarwulan, Wiwin; Firmansyah, Irman; Munibah, Khursatul; Santoso, Paulus B.K.; Sudarsono, Sudarsono
AGRIVITA, Journal of Agricultural Science Vol 36, No 3 (2014)
Publisher : Faculty of Agriculture University of Brawijaya and Indonesian Agronomic Assossiation

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Abstract

One of the agricultural public commodities in Indonesia which still cannot fulfill its domestic consumption needs is soybean. The objectives of the research, which was conducted in Karawang Regency, West Java, Indonesia, were to: (i) identify the suitable area for soybean plantations in paddy fields, (ii)  assess the development of soybeans in land use and socio-economic context, and (iii) plan the spatially soybean plantation. A soil survey and land evaluation for soybean was completed. IKONOS imagery was applied to delineate paddy fields while a dynamic system modelling was developed using Powersim 8.0 software. The results of the research showed that the suitability class for soybean plantation in the paddy fields of Karawang Regency ranges from unsuitable (N) to suitable (S2), with limiting factors being temperature, fertility, nutrients retention, slope, erosion, rooting media and toxicity. Very limited arable land  has been used so far for soybeans plantations due to low economic returns. The model predicts that, should the development of soybean continues in its business as usual path, a deficit of soybean will occur in 2030. The model provides alternative scenarios to reduce the deficit. Prioritization was done spatially using the suitable land gradually, corresponding to the government budget availability.
APPRAISAL KEBERLANJUTAN MULTIDIMENSI PENGGUNAAN LAHAN UNTUK SAWAH DI KARAWANG - JAWA BARAT Ambarwulan, Wiwin; Firmansyah, Irman; Widiatmaka, Widiatmaka; Munibah, Khursatul; Sitorus, Santun R.P.
Jurnal Kawistara Vol 5, No 2 (2015)
Publisher : Sekolah Pascasarjana UGM

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Abstract

Indonesian national food sovereignty is very dependent on the supply of rice from paddy fields in Java Island. Various factors influence the farmer’s decision to continue using his farm. This study aims to analyze the sustainable use of paddy field, determinant factors and strategies for improving sustainability. The study was conducted in Karawang Regency, one of the centers of rice production in West Java. The methodology used is a multi-dimensional scaling (MDS) using 43 attributes of 5 dimensions (ecological, social, economical, technological and legal and institutional dimension). Against the sensitive attribute analysis resulting from MDS, a prospective analysis was conducted to determine the key factors of sustainability. Priority policies for improving sustainability are developed based on the location of the key factors in the prospective diagram. The research results showed that the land utilization for paddy field in Karawang is actually less sustainable. Increasing the sustainability can be done through intervention and improving performance, preferably on sensitive attributes resulting from leverage analysis, covering 16 attributes. Priority policies is directed in the 5 key factors resulting from prospective analysis. Policies suggested are the tightening of new permits for building, strict implementation of the official spatial land use planning and delineation of agricultural land for sustainable food crops, counseling the community, revitalizing the role of BULOG, provision of subsidies as well as capital assistance to farmers.
The Spatio Temporal Dynamic of Diffuse Attenuation Coefficient in the Tropical Berau Estuary, East Kalimantan Indonesia Ambarwulan, Wiwin; Widiatmaka, Widiatmaka
Indonesian Journal of Geospatial Vol 3, No 1 (2014)
Publisher : Indonesian Journal of Geospatial

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Abstract

Abstract. The availability of light in the water column determines the euphotic zone and constrains the type and the vertical distribution of benthic species. Diffuse attenuation coefficient (Kd) is an important apparent optical property (AOP) that provide information about the attenuation of the spectral down welling solar irradiance with depth in the water. Ocean color Satellite provide global coverage of optical water quality parameters at spatial and temporal resolution. Several empirical and semi-analytical models are commonly used to derive Kd at wavelength 490 nm Kd(490) from ocean colour satellite sensors. This study present about the diffuse attenuation coefficient, Kd(490) using semi-analytical approach. The dynamic Kd(490) in the Berau Estuary water was studied and compared with those derived from ocean color satellite sensor, Medium Resolution Imaging Spectrometer (MERIS). The study indicated that Kd(490) of in situ measurement had the best correlation with the Kd(490) of MERIS data of remote sensing reflectance (Rrs) derived with FUB (Free University Berlin) algorithm (R2=0,84). The dynamic of Kd(490) from MERIS data on different date indicated that the Kd(490) have a similar pattern and decreased when going to offshore. Keywords: MERIS, Secchi disc depth, tropical coastal water, Kd(490), a semi-analytical approach
PERENCANAAN SPASIAL PEMANFAATAN LAHAN UNTUK KOMODITAS PERKEBUNAN RAKYAT DI KABUPATEN PIDIE JAYA, PROVINSI NANGROE ACEH DARUSSALAM Widiatmaka, Widiatmaka; Zulfikar, Zulfikar; Anwar, Syaiful; Ambarwulan, Wiwin
GEOMATIKA Vol 19, No 1 (2013)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (329.621 KB) | DOI: 10.24895/JIG.2013.19-1.169

Abstract

ABSTRAK Kabupaten Pidie Jaya merupakan kabupaten baru yang didirikan pada tahun 2007,di Provinsi Nanggroe Aceh Darussalam (NAD). Salah satupotensi yang dapat dikembangkan untuk peningkatan pendapatan masyarakat setempat adalah perkebunan rakyat.Penelitian ini bertujuan untuk merencanakan pemanfaatan lahan untuk beberapa komoditas perkebunan rakyat. Komoditas basis dianalisis menggunakan metoda locationquotient(LQ). Kemampuan dan kesesuaian lahan dievaluasi menggunakan Sistem Informasi Geografis (SIG) berdasarkan kriteria kebutuhan tanaman. Kelayakan financial dianalisis menggunakan metode Net Present Value (NPV) dan Break Even Point (BEP). Keunggulan komparatif dan kompetitif diestimasi menggunakan metode Policy Analysis Matrix(PAM). Metode Analytical Hierarchy Process(AHP) digunakan untuk analisis persepsi masyarakat.Hasil penelitian menunjukkan bahwa kakao merupakan komoditas basis di Pidie Jaya. Selain kakao,rencana pemerintah daerah untuk mengembangkan perkebunan rakyat kelapa sawit perlu diperhitungkan. Berdasarkan analisis kemampuan lahan,wilayah yang dapat digunakan untuk pengembangan perkebunan rakyat adalah 45.784,78 hektar.Kakao dan kelapa sawit merupakan komoditas yang sesuai dikembangkan di Kabupaten Pidie Jaya,kelas kesesuaian lahannya adalah S2 (cukup sesuai) dan S3 (sesuai marginal) untuk kedua komoditas. Secara finansial, kakao dan kelapa sawit layak diusahakan pada discount factor 17 %, dengan NPV sebesar Rp26.051,158 dengan BEP produksi 505 kg hektar dan harga Rp. 5.568/kg untuk kakao, dan NPV sebesar Rp. 45.547.405 dengan BEP produksi 7.423 kg/hektar dan harga Rp. 301/kg untuk kelapa sawit. Kedua komoditas memiliki keunggulan komparatif dan kompetitif dengan nilai koefisien PCR<1 dan DRC<1. Hasil analisis persepsi masyarakat menunjukkan bahwa kakao merupakan prioritas utama untuk dikembangkan. Wilayah yang direkomendasikan untuk pengembangan kakao dan kelapa sawit di Pidie Jaya adalah seluas 27.178,97 hektar.  Kata Kunci: Kesesuaian Lahan, Kakao, Kelapa Sawit, Kelayakan Ekonomi, Proses Hierarkhi Analitik. ABSTRACT Pidie Jaya Regency is new regency in Nanggroe Aceh Darussalam (NAD) Province that was established in 2007. One of potency to be developed for income generating of local community is smallholding plantation. The purpose of this research is to plan land utilization for several commodities of smallholding plantation. Basic sector was analyzed using location quotient (LQ). Land capability and land suitability were evaluated by using Geographic Information System (GIS) based on land requirement criteria. Financial feasibility was analyzed using Net Present Value (NPV) and Break Event Point (BEP) methods.The comparative and competitive advantages were estimated by using of Policy Analysis Matrix (PAM) method. Method of Analytical Hierarchy Process (AHP) was used to analysis the community perception. The results of the research showed that cocoa is the basic commodity in Pidie Jaya. In addition to cocoa, plan of local government to develop oil palm smallholding plantation in the area was taken into account. Based on land capability analysis,the area which is able to be used for agricultural plantation commodity is 45.784,78 hectares. Cocoa and oil palm crop are suitable in Pidie Jaya Regency with actual land suitability class of S2 (suitable) and S3 (marginally suitable) for both commodities. Financially, cocoa and oil palm are feasible at discount factorof 17 %, with NPV of Rp 26.051,158 with production BEP of 505 kg/hectares and price of Rp. 5.568 /kg for cocoa and NPV of Rp. 45.547.405 with production BEP of 7.423 kg/hectares and price of Rp. 301 /kg for oil palm. Both of commodity have comparative and competitive advantages with coefficient value of PCR <1 and DRC <1. Result of community perception analysis indicates that cocoa are the main priority commodities to be developed. The area which is able to be recommended for development of cocoa and oil palm crop in Pidie Jaya is 27.178,97 hectares. Keywords : Land Suitability, Cocoa, Oil Palm, Economic Feasibility, Analytical Hierarchy Process.
PERENCANAAN SPASIAL PENINGKATAN PRODUKSI KEDELAI BERBASIS KESESUAIAN LAHAN DI KABUPATEN LOMBOK TIMUR PROVINSI NUSA TENGGARA BARAT Widiatmaka, Widiatmaka; Ambarwulan, Wiwin; Munajati, Sri Lestari; Munibah, Khursatul; Murtilaksono, Kukuh; Tambunan, Rudi P; Nugroho, Yusanto A; Santoso, Paulus B.K.; Suprajaka, Suprajaka; Nurwadjedi, Nurwadjedi
MAJALAH ILMIAH GLOBE Vol 15, No 2 (2013)
Publisher : Badan Informasi Geospasial

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (370.475 KB) | DOI: 10.24895/MIG.2013.15-2.86

Abstract

Pemanfaatan data survei tanah dan evaluasi lahan dilakukan untuk perencanaan peningkatan produksi kedelai menjawab tantangan kelangkaan pasokan kedelai di Kab. Lombok Timur, Provinsi Nusa Tenggara Barat. Data yang digunakan adalah hasil survei oleh Pusat Pemetaan dan Integrasi Tematik, Badan Informasi Geospasial dilengkapi dengan analisis citra dan evaluasi lahan fisik dan ekonomi untuk kedelai. Analisis kesesuaian lahan fisik dan ekonomi untuk kedelai dilakukan menggunakan Automated Land Evaluation System (ALES). Penggunaan lahan diinterpretasi menggunakan citra SPOT-5, dipertajam dengan data lebih detil menggunakan citra IKONOS dari Kementerian Pertanian. Hasil-hasil analisis diinterpretasi dalam term potensi intensifikasi kedelai pada lahan sawah eksisting dan potensi perluasan tanaman kedelai pada lahan kering yang potensial. Hasil analisis menunjukkan bahwa di wilayah Kabupaten Lombok Timur masih dimungkinkan dilakukan intensifikasi dan ekstensifikasi untuk peningkatan produksi kedelai dalam rangka peningkatan ketahanan pangan regional. Persoalannya, keuntungan petani dalam budidaya kedelai pada berbagai kelas kesesuaian lahan jauh lebih kecil dibandingkan pengusahaan padi sawah. Perencanaan fisik berbasis kesesuaian lahan perlu diikuti dengan upaya menciptakan kondisi agar penanaman kedelai menarik bagi petani dari sisi ekonomi.Kata Kunci: Ketahanan Pangan, SPOT-5, Kesesuaian Lahan, Sistem Evaluasi Lahan Otomatis.ABSTRACTData from soil survey and land evaluation were used in planning for increasing  soybean production, answering the lack of soybean supply in East Lombok Regency, West Nusa Tenggara Province. The results of the survey of Center for Integrated Mapping, Geospatial Information Agency were used, combined with image analysis and physical and economical land suitability analysis for soybeans. Analysis of physical and economical land suitability for soybean was performed using Automated Land Evaluation System (ALES). Land use was interpreted using SPOT-5 imagery, completed by the data of IKONOS imagery from Ministry of Agriculture. The results of the analysis were interpreted in terms of the potential intensification of soybean on existing ricefield and the potential expansion of soybean crops ondry land. The analysis showed that in East Lombok Regency, there is still possible to do the intensification and extension of soybean in order to improve regional food security. The problem is, benefit of farmers in the cultivation of soybeans in various land suitability classes are much smaller than rice cultivation. Physical planning based on land suitability needs to be coupled with efforts to create an attractive situation to farmers for planting soybean.Keywords: Food Security, SPOT-5, Land Suitability, Automated Land Evaluation System.
PERUBAHAN CADANGAN KARBON ORGANIK TANAH DALAM KONTEKS PERUBAHAN PENGGUNAAN LAHAN SELAMA 2 DEKADE Widiatmaka, Widiatmaka; Ardiansyah, M; Ambarwulan, Wiwin
MAJALAH ILMIAH GLOBE Vol 14, No 2 (2012)
Publisher : Badan Informasi Geospasial

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (327.843 KB) | DOI: 10.24895/MIG.2012.14-2.148

Abstract

Karbon organik tanah (KOT) memainkan peranan yang sangat penting dalam siklus karbon global, karena merupakan pole karbon permukaan bumi yang paling besar. Pole karbon tanah merupakan 4,2 kali dari seluruh pole karbon atmosferik dan 5,7 kali pole biotik. Penelitian ini bertujuan untuk menghitung perubahan penggunaan dan tutupan lahan yang terjadi dalam kurun 2 dekade, antara 1989 dan 2006 dengan mengggunakan citra Landsat 5 TM dan Landsat 7 ETM+, dan mengkuantifikasikan besaran karbon organik di dalam tanah dan untuk memperkirakan keterkaitan antara perubahan karbon organik tanah dan perubahan penggunaan dan tutupan lahan di Kabupaten Bogor selama 2 dekade terakhir. Hasil penelitian menunjukkan bahwa terjadi penurunan total luas hutan dan sawah masingmasing 24.975 ha dan 54.406 ha di wilayah penelitian. Perubahan dalam penggunaan lahan telah menghasilkan kehilangan yang mengkhawatirkan terhadap ketersediaan karbon tanah pada wilayah penelitian. Secara rata-rata, konversi hutan dan sawah menjadi ladang dan lahan terbuka/permukiman di Kabupaten Bogor menurunkan total KOT 21,33 % dari 25,99 x 106 ton pada tahun 1989 menjadi 20,44 x 106 ton pada tahun 2006. Kata Kunci: Karbon Organik Tanah, Perubahan Penggunaan Lahan ABSTRACTSoil organic carbon plays an important role in the global carbon cycle, because it is a most amount carbon pole of the earth surface. Soil carbon pole is 4,2 times that of the entire atmospheric carbon pole and 5,7 times of the biotic pole. This study aimed to quantify changes in the land use and land cover occurred in the past two decades between the 1989 and 2006 by using Landsat 5 TM and Landsat 7 ETM+, to quantify the amount of organic carbon in the soil and to estimate the relationship between changes in soil organic carbon and changes in land use and land cover in Bogor during 2 decades. The results showed that the total area of forest and rice fields decline, up to 24.975 ha and 54.406 ha in the study area. Changes in land use have resulted in an alarming loss of soil carbon stocks in the research area. On average, the conversion of forests and rice fields in Bogor Regency decrease 21,33% of total soil organic carbon, from 25,99 x 106 tons in 1989 to 20,44 x 106 tons in 2006.Keywords: Soil Organic Carbon, Landuse Change
Co-Authors A.A. Ketut Agung Cahyawan W Hefni Effendi Irman Firmansyah Irman Firmansyah Khursatul Munibah Kukuh Murtilaksono M Ardiansyah, M Nurwadjedi Nurwadjedi, Nurwadjedi Paulus B.K. Santoso Rudi P Tambunan, Rudi P Santun R.P. Sitorus Sri Lestari Munajati, Sri Lestari Sudarsono Sudarsono Suprajaka Suprajaka Widiatmaka . Yudi Setiawan Yusanto A Nugroho, Yusanto A