Daniel Murdiyarso
Lecturer On Geophysic And Meteorology Departemen, Bogor Agricultural University (IPB) Center For International Forestry Research (CIFOR)

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KOREKSI BIAS LUARAN MODEL IKLIM REGIONAL UNTUK ANALISIS KEKERINGAN Jadmiko, Syamsu Dwi; Murdiyarso, Daniel; Faqih, Akhmad
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) Vol 41, No 1 (2017)
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v41n1.2017.25-35

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Abstrak: Luaran simulasi model iklim regional perlu dikoreksi karena memiliki bias sistematis secara spasial dan temporal. Kajian ini membahas simulasi koreksi bias menggunakan metode statistik. Data yang dikoreksi adalah data curah hujan luaran simulasi RegCM4.4 pada periode 1981-2005. Dari simulasi koreksi bias tersebut kami mendapati bahwa koreksi bias menggunakan regeresi linear tidak mampu memperbaiki distribusi spasial maupun pola hujan. Namun, dengan menggunakan regresi polinomial, koreksi bias menunjukkan luaran yang lebih baik terutama dengan regresi polinomial orde 3. Lebih dari itu, regresi polinomial orde 3 yang dikombinasikan dengan intersep yang dikembalikan pada nilai nol memberikan luaran koreksi bias yang terbaik dan dapat digunakan untuk melakukan analisis kekeringan lahan. Kami mendapati bahwa analisis kekeringan dengan metode Standardized Precipitation Index (SPI) yang diuji menggunakan skala waktu 1, 3, 6 dan 12 bulan memberikan hasil terbaik jika menggunakan skala waktu lebih dari 1 bulan. Hal ini dapat dilihat dari hubungannya dengan nilai anomali curah hujan dan jejak kekeringan yang terjadi pada tahun El-Nino seperti tahun 1982/1983, 1986/1987 dan 1997/1998.Abstract. The outputs of regional climate model simulations need to be corrected because of their systematic spatial and temporal biases. This study simulates bias correction using the statistical methods on rainfall data outputs generated by RegCM4.4 during the period of 1981-2005. We found that linier regression did not improve the spatial distribution and pattern of rainfall data. However, by using polynomial regression better results were performed especially third order polynomial. Moreover, when the third order of polynomial regression was combined with the zero intercept, it gave the best bias correction and therefore, can be further used for drought analysis. Standardized Precipitation Index (SPI) method was used to analyze drought index with different time scale of 1, 3, 6 and 12-months. We found that SPI performed well when implemented for time scale more than 1-month. This was demonstrated by the relationship with the rainfall anomaly and drought history during El-Nino years of 1982/1983, 1986/1987 and 1997/1998.
HUBUNGAN AIR TANAMAN Acacia mangium Willd. DI HUTAN TANAMAN, PERUM PERHUTANI BOGOR WATER PLANT RELATIONSHIP OF Acacia mangium IN PERUM PERHUTANI FOREST, BOGOR N. Fitri Hariyati; D. Murdiyarso
Agromet Vol. 18 No. 2 (2004): December 2004
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1289.666 KB) | DOI: 10.29244/j.agromet.18.2.13-23

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PENDUGAAN SURPLUS AIR TANAH MENGGUNAKAN MODEL NERACA AIR (STUDI KASUS SUB DAERAH ALIRAN SUNGAI CICATIH)ESTIMATES OF SOIL MOISTURE SURPLUS USING WATER BALANCE MODEL IN CICATIH WATERSHED S. Kurnianto; D. Murdiyarso
Agromet Vol. 18 No. 2 (2004): December 2004
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1167.641 KB) | DOI: 10.29244/j.agromet.18.2.37-47

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KEKERINGAN CUACA DAN KEBAKARAN HUTAN DI TAMAN NASIONAL BERBAK, SUMATERAWEATHER DROUGHT INDEX AND FIRE IN BERBAK NATIONAL PARK, SUMATERA A. Asril; Daniel Murdiyarso; Bambang Hero Saharjo
Agromet Vol. 17 No. 1 & 2 (2003): June 2003
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1367.372 KB) | DOI: 10.29244/j.agromet.17.1 & 2.30-39

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PENGUJIAN DAN PENERAPAN MODEL SIMULASI PERTUMBUHAN DAN PERKEMBANGAN TANAMAN GANDUM (Triticum aestivum L.) BERDASARKAN INTERAKSI AIR DAN NITROGENVALIDATION AND APPLICATION OF THE GROWTH AND DEVELOPMENT SIMULATION MODEL OF WHEAT ... Johannes E. X. Rogi; I. Handoko; D. Murdiyarso; Aan A. Daradjat
Agromet Vol. 13 No. 1 (1998): JUNE 1998
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (11956.217 KB) | DOI: 10.29244/j.agromet.13.1.25-40

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STATUS AIR TANAMAN SENGON (Alibizia falcataria (L.) Fosberg) PADA BERBAGAI KONDISI TEMPAT TUMBUH D. Murdiyarso; Pasril Wahid; Riza Adelia
Agromet Vol. 8 No. 1 (1992): June 1992
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2076.065 KB) | DOI: 10.29244/j.agromet.8.1.41-53

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SOCIO - ECONOMIC IMPACT OF CLIMATE CHANGE M. Blantran de Rozari; K. Koesoebiono; N. Sinukaban; D. Murdiyarso; K. Makarim
Agromet Vol. 7 No. 1 (1991): JUNE 1991
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4093.177 KB) | DOI: 10.29244/j.agromet.7.1.1-51

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KERUSAKAN TEGAKAN TINGGAL AKIBAT PEMANENAN KAYU REDUCED IMPACT LOGGING DAN KONVENSIONAL DI HUTAN ALAM TROPIKA (STUDI KASUS DI AREAL IUPHHK PT. INHUTANI II, KALIMANTAN TIMUR) (Residual Stand Damage Caused by Conventional and Reduced Impact Logging)) Muhdi Muhdi; Elias Elias; Daniel Murdiyarso; Juang R Matangaran
Jurnal Manusia dan Lingkungan Vol 19, No 3 (2012): November
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jml.18468

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ABSTRAKPenelitian ini bertujuan untuk mengetahui kerusakan tegakan tinggal akibat pemanenan kayu dengan teknik reduced impact logging (RIL) di hutan alam tropika. Penelitian dilakukan di areal PT Inhutani II, Kalimantan Timur. Petak penelitian ini masing-masing 3 (tiga) plot permanen dengan ukuran masing-masing 100 m x 100 m. Plot-plot permanen/pengukuran diletakkan secara sistematis pada kedua petak  penelitian  sedemikian rupa sehingga mewakili tempat-tempat sebagai berikut : lokasi tempat pengumpulan kayu (TPN),  di lokasi jalan sarad utama dan di lokasi jalan sarad cabang. Hasil inventarisasi tegakan menunjukkan bahwa potensi tegakan rata-rata pada petak pemanenan kayu konvensional dan RIL masing-masing sebesar 353,51 N/ha dan 362,67 N/ha. Jumlah kerusakan tegakan tinggal rata-rata akibat pemanenan kayu pada petak pemanenan kayu konvensional dan RIL masing-masing sebesar 134,67 N/ha (38,10 %) dan 85,33 N/ha (23,52 %). Hasil penelitian menunjukkan bahwa dengan diterapkan teknik pemanenan kayu RIL dapat mengurangi kerusakan tegakan tinggal tingkat tiang dan pohon sebesar 9,86 N/ha atau 36,61 % dari yang dihasilkan pada petak pemanenan kayu konvensional. Dengan demikian pemanenan kayu konvensional menyebabkan kerusakan tegakan tinggal lebih besar dibandingkan  dengan teknik RIL. ABSTRACTThis research examined the effect of reduced impact logging (RIL) to residual stand damages in natural tropical forest. A  research was done at  natural tropical forest of PT Inhutani II, East Kalimantan. The effect of reduced impact logging to residual stand were studied using the data of three plots with each size 100 m x 100 m are placed based on purposive sampling at landing, main skiddtrail and branch skiddtrail, respectively. The results of the research showed that that the potency of commercial timber species in conventional logging and RIL were 353.51 N/ha  and  362.7 N/ha. The number of residual stand damages caused by conventional logging and RIL were 134.67 N/ha (38.10 %) and 85.33 N/ha (23.52 %). Results of the research showed that reduced impact logging is reduced trees damages 9.86 N/ha (36.61 %) compared with conventional logging. These researches indicated that conventional logging in the tropical natural forest caused heavier damage on residual stand when compared with a reduced impact logging.