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All Journal Indonesian Journal of Geography BIOTROPIA - The Southeast Asian Journal of Tropical Biology Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments)
Djoko Harmantyo
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science Immunology & microbiology Veterinary

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A PRELIMINARY INVESTIGATION ON CHANGING TEMPERATURE MAXIMA-MINIMA DEVIATION (TMIN-MAX DEVIATION) IN INDONESIA Djoko Harmantyo
Indonesian Journal of Geography Vol 43, No 1 (2011): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.2297

Abstract

While the immediate impacts of climate change have been widely discussed,there are only few researches on climate change revealing its effect to temperatureamplitude. Changing temperature amplitude will hamper metabolism process,which in turn will decrease productivity and, even, cause the extinction of certainorganism species. This research will expose the changing temperature amplitude (Tminmax)including its trend pattern in Indonesia. The adoption of trend analysis methodand comparison analysis to the values of temperature amplitude in 60 AWS stationfrom 1980-2007 indicates upward trend of annual mean temperature with shortertemperature amplitude. This shorter temperature amplitude is characterized byannual mean temperature maxima increase less than the rise of annual meantemperature minima. Data analysis finds indication, i.e. the more eastward direction, thegreater difference of average Tmin-max deviation. Yet, this research fails to show whatfactors contributing to the changing temperature amplitude. More in-depth researchof these factors at ecological scale will be necessary as crucial part in determiningadaptation programs to this on-going climate change phenomenon.
SYSTEM DYNAMICS MODELING OF LAND USE CHANGE IN WEST KALIMANTAN, INDONESIA Pahrian Ganawira Siregar; Jatna Supriatna; Raldi Hendro Koestoer; Djoko Harmantyo
BIOTROPIA - The Southeast Asian Journal of Tropical Biology Vol. 25 No. 2 (2018)
Publisher : SEAMEO BIOTROP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3410.986 KB) | DOI: 10.11598/btb.2018.25.2.792

Abstract

The main effects of human activities on the environment result in land use and land cover changes. Land over exploitation and development activities in West Kalimantan of Indonesia necessitated the focus of this research which aims to analyzing and predicting land use changes in West Kalimantan. The results of such a study assist researchers, planners and policy makers to formulate suitable land use policies in the future in order to balance economic development and natural resource conservation. Moreover, it makes Indonesia shift from middle incomes to become a developed country in 2030.  Methodology employs field observation, key informant interviews, focus group discussions and system dynamics modeling. The field observation covered communities in several locations in the study site to identify pattern of land use. The system dynamics was applied to analyze the land use change system and estimate the extents of land cover change in the future. The study showed several outcomes: (i) The main leverage factors in the land use change system in West Kalimantan were the desire to reach the expected economic growth and the increased per capita consumption of edible oil globally; (ii) In the business as usual modeling, the increasing global demand  for edible oil will lead to significant increment of oil palm plantation area, even the total area of plantation could be wider compare to that of the remaining forest area by 2030; (iii) Key interventions that need to be considered in the future is to conduct reforestation (with reforestation rate of at least 0.5% per year) and limited oil palm plantation development to maximum of 50% of developed  area.
Variabilitas curah hujan di Kabupaten Kebumen Satria Indratmoko; Djoko Harmantyo; Eko Kusratmoko
Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Vol 1, No 1 (2017): August
Publisher : Open Journal System

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (808.977 KB) | DOI: 10.7454/jglitrop.v1i1.5

Abstract

Curah hujan merupakan unsur iklim yang sangat bervariasi, baik dalam skala ruang maupun waktu. Variasi curah hujan ini akan berdampak pada penentuan awal masa tanam khususnya tanaman padi. Melalui penghitungan statistik dan pemetaan data spasial, penelitian ini akan mengungkapkan pola awal musim tanam sebagai respon terhadap variabilitas curah hujan di Kabupaten Kebumen selama periode tiga puluh tahun, yaitu tahun 1981 – 2010. Analisis spasial yang diperkuat dengan pendekatan statistik mengungkapkan bahwa wilayah pesisir di Kabupaten Kebumen memiliki variabilitas curah hujan yang tinggi dengan rata-rata curah hujan rendah. Semakin tinggi tempat, variabilitas curah hujannya menurun diikuti rata-rata curah hujan tinggi. Selain itu, awal musim tanam padi dimulai pada wilayah dengan variabilitas curah hujan yang rendah (perbukitan) menuju wilayah variabilitas curah hujan tinggi (pesisir). Pada periode 1981 – 2000, awal musim tanam padi dimulai dari utara dan secara berkala menuju selatan Kabupaten Kebumen. Sedangkan pada periode 2001 – 2010, awal musim tanam padi dimulai dari barat laut dan secara berkala menuju tenggara dan selatan Kabupaten Kebumen.
Co-Authors Eko Kusratmoko Jatna Supriatna Pahrian Ganawira Siregar Raldi Hendro Koestoer, Raldi Hendro Satria Indratmoko