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All Journal Jurnal Penelitian Pengelolaan Daerah Aliran Sungai JURNAL HUTAN TROPIS Jurnal Penelitian Kehutanan Wallacea
Beny Harjadi
Balai Penelitian dan Pengembangan Teknologi Pengelolaan Daerah Aliran Sungai
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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PERAN CEMARA LAUT (Casuarina equisetifolia) DALAM PERBAIKAN IKLIM MIKRO LAHAN PANTAI BERPASIR DI KEBUMEN (The role of Casuarina equisetifolia on micro climate improvement of sandy beach land at Kebumen) Beny Harjadi
Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Management Research) Vol 1, No 2 (2017): Jurnal Penelitian Pengelolaan Daerah Aliran Sungai (Journal of Watershed Managem
Publisher : Center for Implementation of Standards for Environmental and Forestry Instruments Solo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (866.801 KB) | DOI: 10.20886/jppdas.2017.1.2.73-81

Abstract

Sandy beach is a marginal land, when it is not managed properly the conditions will be worsened and at the end it cannot be planted. This marginal land is aggravated by unfavorable conditions such as extreme high temperatures, the presence of salt vapor that causes the plants to die, and the lacking of water for plants. With regard to this matter, it is necessary to conduct a research that aims to determine the role of Casuarina equisetifolia  in improving the microclimate of sandy beaches. The research was conducted on sandy beaches in Karanggadung, Petanahan Subdistrict, Kebumen since 2005, with climate observations from 2009 to 2014. The climate observation method is by measuring light, air temperature, humidity, air pressure and altitude. Each measurement used three repetitions for each location and measured twice a day: 07.00 and 16.00. The results showed that the existence of C. equisetifolia gave a positive effect on micro climate improvement at Karanggadung Beach, Kebumen which included: 1) decreasing light intencity from 1925 lux to 213 lux, 2) decreasing air temperature from 31 °C to 25 °C, 3) increasing  air humidity from 84% to 100%, 4) increasing air pressure from 1007 mb to 1008 mb, and 5) increasing sand dune level from 27 m ASL (Above Sea Level) to 35 m ASL.
ANALISIS PERHITUNGAN TOLERANSI EROSI DI DAERAH TANGKAPAN WADUK KEDUNG OMBO, BOYOLALI Beny Harjadi
Jurnal Hutan Tropis Vol 5, No 2 (2017): Jurnal Hutan Tropis Volume 5 Nomer 2 Edisi Juli 2017
Publisher : Lambung Mangkurat University-Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jht.v5i2.4368

Abstract

The purpose of this research is to get the distribution of erosion tolerance value (T-value) in KedungOmbo Dam Catchment Area. The KedungOmbo Dam Catchment Area is located in Boyolali area as a food granary with the main supply of vegetables and rice producers. This situation requires soil conditions to be maintained and no land degradation or erosion that exceeds the limits of erosion or erosion tolerance allowed. The method used to calculate the T-value is the survey and by the calculation of raster analysis with satellite imagery. The parameter collected in the field includes soil conditions (soil solum) and crop conditions (effective root depth). Based on T-value calculation formula with 300 years life resource, this will get the amount of erosion allowed in KedungOmbo Dam Catchment Area. Areas with low T values should be maintained for land conditions because mild erosion will be a serious threat. The erosion tolerance in the KedungOmbo Dam Catchment Area is 59%, which is dominated by high T-values, with an area of 34,092 ha and a very high 24% or an area of 14,136 ha.Keywords: Land degradation; Sheet erosion; Value-T; Land productivityTujuan dari penelitian ini untuk mendapatkan sebarannilai toleransi erosi (nilai-T) di Daerah Tangkapan Waduk (DTW) Kedung Ombo. Mengingat DTW Kedung Ombo termasuk wilayah Boyolali sebagai lumbung pangan dengan pasokan utama sayuran dan juga produsen padi. Situasi ini membutuhkan kondisi tanah harus dipertahankan dan tidak ada degradasi lahan atau erosi yang melebihi batas toleransi erosi atau erosi diperbolehkan. Metode yang digunakan untuk menghitung nilai-T dengan cara survei dan dibantu dengan perhitungan analisis raster dengan citra satelit. Parameter yang dikumpulkan di lapangan meliputi kondisi tanah (solum tanah) dan kondisi tanaman (kedalaman perakaran efektif). Dari rumus perhitungan nilai-T dengan resource life 300 tahun akan mendapatkan besarnya erosi yang diperbolehkan di seluruh DTW Kedung Ombo. Daerah dengan nilai T yang rendah harus dijaga kondisi lahannya, karena erosi ringan saja akan menjadi ancaman serius. Toleransi erosi di DTW Kedung Ombo 59% didominasi oleh nilai-T yang tinggi, seluas 34.092 ha dan sangat tinggi 24% atau seluas 14.136 ha.Kata kunci: Degradasi lahan; Erosi permukaan; Nilai-T; Produktivitas lahan
Detection of Water Abundance in Baluran National Park with Landsat Satellite Imagery Analysis Beny Harjadi
Jurnal Penelitian Kehutanan Wallacea Vol. 6 No. 1 (2017)
Publisher : Foresty Faculty of Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1092.305 KB) | DOI: 10.18330/jwallacea.2017.vol6iss1pp53-60

Abstract

Indonesia is one of the mega-biodiversity countries that have a great responsibility in maintaining the balance of the global climate and forest ecosystems. Drought causes shifting of ecosystems causing disturbances on animal life leading to death of species. Alongside fires in the savanna, drought is a recurrent problem in the park, which occurs every year. This study aims to detect the abundance of water by using satellite imagery in Baluran National Park (BNP). The research analyzed using Landsat satellite imagery ETM7 + in 1999 and 2010 and three (3) main factors that have great potential abundance of water, are: (1) plant density (GI = Greenness Index), (2) soil moisture (WI = Wetness Index), and (3) soil conditions (SBI = Soil Brightness Index). Three factors are summed and divided by three to get 5 levels of water abundance: 1) Very abundant, 2) Abundant, 3) Medium, 4) Few, and 5) Very little. The results showed that the abundance of water decreased between 1999 and 2010 for moderate conditions from 85% to 38%, if the abundance of low water (slightly) increased from 15% to 60%. The level of accuracy of the abundance of water in the field of more than 80% is exactly 91%. The extreme drought conditions will be very dangerous for the survival of flora and fauna in Baluran National Park that are in desperate need of water and potentially in danger of a fire. Construction of water reservoirs and water supply continuously using a water tank in the dry season is very necessary in the Baluran National Park.
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