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VARIABILITAS CURAH HUJAN DI KABUPATEN KEBUMEN Indratmoko, Satria; Harmantyo, Djoko; Kusratmoko, Eko
Jurnal Geografi Lingkungan Tropik 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.
SYSTEM DYNAMICS MODELING OF LAND USE CHANGE IN WEST KALIMANTAN, INDONESIA Siregar, Pahrian Ganawira; Supriatna, Jatna; Koestoer, Raldi Hendro; Harmantyo, Djoko
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.