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All Journal BIOTROPIA - The Southeast Asian Journal of Tropical Biology Indonesian Journal of Forestry Research Jurnal Penelitian Hutan dan Konservasi Alam JURNAL BIOLOGI INDONESIA Indonesian Journal of Forestry Research
Haruni Krisnawati
Forest Research and Development Centre, Forestry and Environment Research Development and Innovation Agency
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology Veterinary

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GENERALIZED HEIGHT-DIAMETER MODELS FOR Acacia mangium Willd. PLANTATIONS IN SOUTH SUMATRA Krisnawati, Haruni; Wang, Yue; Ades, Peter K.
Indonesian Journal of Forestry Research Vol 7, No 1 (2010): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The aim of this study was to develop a generalized height-diameter model for predicting tree height of Acacia mangium plantations in South Sumatra that could account for the variability of site and stand conditions. Six commonly used non-linear growth functions (i.e. Gompertz, Chapman-Richards, Lundqvist-Korf, Weibull, modified logistic, and exponential) were selected as candidate base models and were fitted to individual tree’s height-diameter data of A.mangium plantations. A total of 13,302 trees collected from permanent sample plots with various spacing , stand age, and site quality were available for this study. The data were split into two sets: one set being the majority (75%) was used to estimate model parameters and the remaining data set (25%) was used to validate the models. The results showed that the six base models produced almost identical fits with a relatively high root mean squared error (± 3.4 m) and a relatively low proportion of the total variation in obser ved tree height (52.5 - 53.4%). The Lundqvist-Korf (LK) model performed slightly better than the other models based on the goodness of fit as well as bias and standard errors of the predictions. This LK model can be fitted easily and provided more satisfactory fit when additional variables were included into the model, hence was selected as the base model. Introducing stand variables into the selected base model resulted in a significant improvement of the accuracy for predicting heights. The root mean squared error decreased by the value between 0.5564 and 1.4252 m and the proportion of variation explained by the model increased by the value between 13.88 and 33.21%. The best improvement based on fit and model validation was achieved by the generalized height-diameter model with inclusion of stand age and site index.
DOMINANT HEIGHT AND SITE INDEX MODELS FOR Acacia mangium Willd. PLANTATION Krisnawati, Haruni; Wang, Yue; Ades, Peter K.; Wild, Ian W.
Indonesian Journal of Forestry Research Vol 6, No 2 (2009): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

EFFECT OF POST-LOGGING SILVICULTURAL TREATMENT ON GROWTH RATES OF RESIDUAL STAND IN A TROPICAL FOREST Krisnawati, Haruni; Wahjono, Djoko
Indonesian Journal of Forestry Research Vol 7, No 2 (2010): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Post-logging silvicultural treatments are generally performed to improve yields of the remaining tree species by increasing their growth rate. In this study the effects of silvicultural treatment on the growth rates of commercial (dipterocarps and non-dipterocarps) as well as non- commercial tree species in a tropical forest in West Kalimantan were examined and were compared to a control treatment. Silvicultural treatment applied was liberation of future crop trees from lianas and neighbouring competing trees. Treatments were applied to six plots of 80 m x 80 m each. The plots comprised 64 quadrats of 10 m x 10 m to allow better control of measurements. The treatment and control plots were established 6 years after logging. Effects were measured 2,4 and 7 years after treatment application. In all obser vation periods, the growth rates increased with silvicultural treatment. Overall, commercial dipterocarps, commercial non-dipterocarps and non-commercial tree species groups differed in response to silvicultural treatment. The growth rates of commercial tree species in plots that received silvicultural treatment were 62–97% higher than in the control plots. For non-commercial tree species, the increase of growth rates was 20–58%, compared to the control plots. These results indicate that the application of silvicultural treatments after logging could help improve the growth of the residual stands. These provide quantitative information that silvicultural treatments in logged-over forest should be considered as a viable management option and may guide the choice of cutting cycle.
CHANGES IN THE SPECIES COMPOSITION, STAND STRUCTURE AND ABOVEGROUND BIOMASS OF A LOWLAND DIPTEROCARP FOREST IN SAMBOJA, EAST KALIMANTAN Krisnawati, Haruni; Wahjono, Djoko; Imanuddin, Rinaldi
Indonesian Journal of Forestry Research Vol 8, No 1 (2011): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

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Abstract

The dynamics of species composition, stand structure and aboveground biomass were studied over a 4.3-yr period (December 2004 – April 2009) in a lowland dipterocarp forest of Samboja, East Kalimantan. This study was conducted in six permanent sample plots (100 m x 100 m each) distributed over an area of 26.5 ha of Samboja Research Forest. All woody plants = 10 cm dbh (diameter at 1.3 m aboveground) were identified. In December 2004, 2.143 trees were measured in the six plots, consisting of 39 families, 82 genera and 111 species. The condition in April 2009 (after 4.3 yr) was: 2,466 trees, 40 families, 86 genera and 123 species. Most species were found in both occasions. Fourteen new species were registered, which contributed to 9.8% of a net addition of the total number of species found in the six plots. Over the 4.3-yr period, there was also an increase of 15.1% in density, 12.9% in basal area, and 11.6% in aboveground biomass, respectively. The density increased from 357 to 411 trees per ha; the basal area increased from 20.09 to 22.67 m2 ha-1; and the aboveground biomass increased from 286.3 to 319.4 ton ha. The family Dipterocarpaceae was the richest in species (more than 20 species found in both occasions), followed by Euphorbiaceae, Burseraceae, Fabaceae, and Anacardiaceae (more than five species). Most genera (80%) contained just one species, but Shorea with 13 species was the richest. Four families (Dipterocarpaceae, Fabaceae, Myrtaceae and Lauraceae) contained more than 80% of the aboveground biomass in both occasions (75% of them from Dipterocarpaceae family). The increases in species richness and density did not cause any significant differences in the diversity index and diameter distribution. This condition suggested that forest vegetation of the study site maintains its diversity composition and structural features over the period of study.
MODEL PERTUMBUHAN MATRIK TRANSISI UNTUK HUTAN ALAM BEKAS TEBANGAN DI KALIMANTAN TENGAH Krisnawati, Haruni; Suhendang, Endang; Parthama, I.B. Putera
Jurnal Penelitian Hutan dan Konservasi Alam Vol 5, No 2 (2008): Jurnal Penelitian Hutan dan Konservasi Alam
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (405.323 KB)

Abstract

ABSTRAK Model-model pertumbuhan matriks transisi telah  disusun dari  data  hasil  pengukuran ulang petak ukur permanen yang dikumpulkan dari empat blok kawasan hutan bekas tebangan di Kalimantan Tengah. Pohon- pohon dalam setiap petak dikelompokkan ke dalam 13 kelas diameter dengan lebar kelas lima cm dari 10 sampai 72,5+ cm dan tiga kelompok jenis: komersial Dipterocarpaceae, komersial Non-Dipterocarpaceae, dan non-komersial. Di dalam model pertumbuhan matriks ini, jumlah pohon dalam tegakan dan jumlah pohon pada setiap kelas diameter dari suatu kelompok jenis dimodelkan sebagai fungsi dari waktu. Model- model yang tersusun terdiri atas tiga komponen, yaitu model alih tumbuh, tambah tumbuh, dan kematian. Hasil pendugaan model menunjukkan bahwa alih tumbuh suatu jenis dipengaruhi secara positif oleh jumlah pohon jenis yang bersangkutan dan secara negatif oleh luas bidang dasar tegakannya. Peluang transisi (tambah tumbuh) dan kematian pohon suatu jenis dipengaruhi oleh luas bidang dasar tegakan dan diameter pohon. Dugaan jumlah pohon pada setiap kelas diameter kemudian diuji dengan data aktual. Hasil pengujian dengan data aktual menunjukkan bahwa dugaan struktur tegakan (distribusi diameter) dalam enam tahun tidak berbias.
CHANGES IN THE SPECIES COMPOSITION, STAND STRUCTURE AND ABOVEGROUND BIOMASS OF A LOWLAND DIPTEROCARP FOREST IN SAMBOJA, EAST KALIMANTAN Krisnawati, Haruni; Wahjono, Djoko; Imanuddin, Rinaldi
Indonesian Journal of Forestry Research Vol 8, No 1 (2011): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2011.8.1.1-16

Abstract

The dynamics of species composition, stand structure and aboveground biomass were studied over a 4.3-yr period (December 2004 – April 2009) in a lowland dipterocarp forest of Samboja, East Kalimantan. This study was conducted in six permanent sample plots (100 m x 100 m each) distributed over an area of 26.5 ha of Samboja Research Forest. All woody plants = 10 cm dbh (diameter at 1.3 m aboveground) were identified. In December 2004, 2.143 trees were measured in the six plots, consisting of 39 families, 82 genera and 111 species. The condition in April 2009 (after 4.3 yr) was: 2,466 trees, 40 families, 86 genera and 123 species. Most species were found in both occasions. Fourteen new species were registered, which contributed to 9.8% of a net addition of the total number of species found in the six plots. Over the 4.3-yr period, there was also an increase of 15.1% in density, 12.9% in basal area, and 11.6% in aboveground biomass, respectively. The density increased from 357 to 411 trees per ha; the basal area increased from 20.09 to 22.67 m2 ha-1; and the aboveground biomass increased from 286.3 to 319.4 ton ha. The family Dipterocarpaceae was the richest in species (more than 20 species found in both occasions), followed by Euphorbiaceae, Burseraceae, Fabaceae, and Anacardiaceae (more than five species). Most genera (80%) contained just one species, but Shorea with 13 species was the richest. Four families (Dipterocarpaceae, Fabaceae, Myrtaceae and Lauraceae) contained more than 80% of the aboveground biomass in both occasions (75% of them from Dipterocarpaceae family). The increases in species richness and density did not cause any significant differences in the diversity index and diameter distribution. This condition suggested that forest vegetation of the study site maintains its diversity composition and structural features over the period of study.
MODEL TAPER BATANG TANAMAN Khaya anthoteca C.DC. DI HUTAN PENELITIAN PASIRHANTAP, SUKABUMI, JAWA BARAT Harbagung, Harbagung; Krisnawati, Haruni
Jurnal Penelitian Hutan dan Konservasi Alam Vol 6, No 1 (2009): Jurnal Penelitian Hutan dan Konservasi Alam
Publisher : Pusat Penelitian dan Pengembangan Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (195.649 KB)

Abstract

Model taper telah disusun untuk jenis kayu mahoni afrika (Khaya anthoteca C.D.C) yang tumbuh di Hutan Penelitian Pasirhantap, Sukabumi, Jawa Barat. Model taper dapat digunakan untuk menduga volume pohon pada berbagai ketinggian batang dengan cara mengintegralkan model taper tersebut dari atas permukaan tanah sampai pada ketinggian batang tersebut. Data dari 58 pohon contoh berumur 35-60 tahun dengan kisaran diameter antara 20 dan 90 cm dan tinggi batang bebas cabang antara 10 dan 30 m digunakan untuk menyusun model. Delapan persamaan taper telah diuji, tujuh persamaan di antaranya diambil dari sumber literatur, dan sisanya adalah persamaan baru yang diujicobakan dalam penelitian ini. Lima indikator statistik (yaitu  MRES,  AMRES,  RMSE,  MEF adj ,  dan  AIC)  digunakan  untuk  membandingkan  model  dalam kemampuannya untuk menduga diameter pohon. Hasil uji dengan menggunakan data independen menunjukkan bahwa model baru yang dicobakan dalam penelitian ini, yaitu dob h  = 1,0236 + 0,8124 Dbh +0,4960 Hcb – 1,4134 h + 0,0096 h2 menunjukkan hasil yang lebih baik dibandingkan dengan model lainnyadalam hal keakuratan prediksi (jumlah skor paling rendah, yaitu 6). Model ini dapat direkomendasikan untuk menduga diameter batang pada ketinggian tertentu pada jenis kayu mahoni afrika di lokasi studi. Integrasi dari persamaan ini menghasilkan persamaan volume:h22 Vh1 − h2   = ð / 40000 ∫ dobh ähh1yang  dapat  digunakan  untuk  menduga  volume  batang  sampai  pada  ketinggian  batang  tertentu  yangdiperdagangkan maupun volume batang total.
GENERALIZED HEIGHT-DIAMETER MODELS FOR Acacia mangium Willd. PLANTATIONS IN SOUTH SUMATRA Krisnawati, Haruni; Wang, Yue; Ades, Peter K.
Indonesian Journal of Forestry Research Vol 7, No 1 (2010): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2010.7.1.1-19

Abstract

The aim of this study was to develop a generalized height-diameter model for predicting tree height of Acacia mangium plantations in South Sumatra that could account for the variability of site and stand conditions. Six commonly used non-linear growth functions (i.e. Gompertz, Chapman-Richards, Lundqvist-Korf, Weibull, modified logistic, and exponential) were selected as candidate base models and were fitted to individual tree’s height-diameter data of A.mangium plantations. A total of 13,302 trees collected from permanent sample plots with various spacing , stand age, and site quality were available for this study. The data were split into two sets: one set being the majority (75%) was used to estimate model parameters and the remaining data set (25%) was used to validate the models. The results showed that the six base models produced almost identical fits with a relatively high root mean squared error (± 3.4 m) and a relatively low proportion of the total variation in obser ved tree height (52.5 - 53.4%). The Lundqvist-Korf (LK) model performed slightly better than the other models based on the goodness of fit as well as bias and standard errors of the predictions. This LK model can be fitted easily and provided more satisfactory fit when additional variables were included into the model, hence was selected as the base model. Introducing stand variables into the selected base model resulted in a significant improvement of the accuracy for predicting heights. The root mean squared error decreased by the value between 0.5564 and 1.4252 m and the proportion of variation explained by the model increased by the value between 13.88 and 33.21%. The best improvement based on fit and model validation was achieved by the generalized height-diameter model with inclusion of stand age and site index.
DOMINANT HEIGHT AND SITE INDEX MODELS FOR Acacia mangium Willd. PLANTATION Krisnawati, Haruni; Wang, Yue; Ades, Peter K.; Wild, Ian W.
Indonesian Journal of Forestry Research Vol 6, No 2 (2009): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2009.6.2.148-165

Abstract

EFFECT OF POST-LOGGING SILVICULTURAL TREATMENT ON GROWTH RATES OF RESIDUAL STAND IN A TROPICAL FOREST Krisnawati, Haruni; Wahjono, Djoko
Indonesian Journal of Forestry Research Vol 7, No 2 (2010): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2010.7.2.112-124

Abstract

Post-logging silvicultural treatments are generally performed to improve yields of the remaining tree species by increasing their growth rate. In this study the effects of silvicultural treatment on the growth rates of commercial (dipterocarps and non-dipterocarps) as well as non- commercial tree species in a tropical forest in West Kalimantan were examined and were compared to a control treatment. Silvicultural treatment applied was liberation of future crop trees from lianas and neighbouring competing trees. Treatments were applied to six plots of 80 m x 80 m each. The plots comprised 64 quadrats of 10 m x 10 m to allow better control of measurements. The treatment and control plots were established 6 years after logging. Effects were measured 2,4 and 7 years after treatment application. In all obser vation periods, the growth rates increased with silvicultural treatment. Overall, commercial dipterocarps, commercial non-dipterocarps and non-commercial tree species groups differed in response to silvicultural treatment. The growth rates of commercial tree species in plots that received silvicultural treatment were 62–97% higher than in the control plots. For non-commercial tree species, the increase of growth rates was 20–58%, compared to the control plots. These results indicate that the application of silvicultural treatments after logging could help improve the growth of the residual stands. These provide quantitative information that silvicultural treatments in logged-over forest should be considered as a viable management option and may guide the choice of cutting cycle.
Co-Authors Djoko Wahjono ENDANG SUHENDANG Harbagung Harbagung, Harbagung I.B. Putera Parthama, I.B. Putera Ian W. Wild Peter K. Ades Rinaldi Imanuddin Yue Wang