Pratiwi Pratiwi - Academia.edu (original) (raw)

Papers by Pratiwi Pratiwi

Jurnal Penelitian Hutan dan Konservasi Alam, 2014

The success of tree planting especially in critical lands, depend on several factors such as spec... more The success of tree planting especially in critical lands, depend on several factors such as species selection suitability, planting objective, land preparation, etc. The aim of this study was to obtain data and information on suitable tree species potentially used in critical land of Lesti Sub Watershed, East Java and visualized in a map. Suitable tree species map was produced by matching tree growth requirements to the condition of soil, topography, climate (precipitation,) and critical land map. It is expected that this information could be used as a consideration in land rehabilitation planning of Lesti Sub Watershed based on critical land level priority.

Journal of Degraded and Mining Lands Management, 2016

Tin mining activities in Bangka Island, besides their important role in contributing to state rev... more Tin mining activities in Bangka Island, besides their important role in contributing to state revenues, also caused damage to the environment, among others in the form of quartz tailings overlay. To rehabilitate this land, in addition to the necessary efforts to improve soil conditions, success is also determined by the selection of appropriate plant species. This study was aimed to determine the adaptability of some legume trees grown on the quartz tailings in land rehabilitation trials in the post tin mining areas of Bangka Island. The legume trees tested were Calliandra calothyrsus Meisn., Caesalpinia sappan L., Enterolobium cyclocarpum (Jacq.) Griseb., Gliricidia sepium (Jacq.) Walp., Delonix regia (Hook.) Raf., and Cassia siamea Lamk. Treatments of growing media applied in the field were medium I (a mixture of 20% organic material, 20% top soil, 1% NPK fertilizer, 5% calcium, and 54% quartz tailings), media II (a mixture of 25%organic material, 25%top soil, 2% NPK fertilizer, 6% calcium, 42% quartz tailings), and media III (a mixture of 30% organic material, 30% top soil, 3% NPK fertilizer, 7% calcium, and 30% quartz tailings). The observation was done by measuring the height and diameter of the stem of the plants, as well as the viability of one year after planting. Analysis of the results of measurements of stem height and diameter showed their diversity. Enterolobium cyclocarpum had the largest dimensions, while the lowest was Caesalpinia sappan. At the age of one year in the field, Gliricida sepium and Enterolobium cyclocarpum showed the average ability of the high life of up to 100%, whereas Calliandra calothyrsus was totally death. In general, the types of legumes selected in this trial showed good adaptability, except for of Calliandra calothyrsus.

Indonesian Journal of Forestry Research, 2012

Encroachments on Carita Research Forest area have exacerbated the degradation of land due to unco... more Encroachments on Carita Research Forest area have exacerbated the degradation of land due to uncontrolled runoff, erosion and nutrient losses especially on the sloping land with high annual rainfall. To reduce the severity of the degradation the area should be rehabilitated by applying soil and water conservation techniques. The techniques used were the vegetative methods (culture), and a combination of it with mechanical/technical methods. The combination method is expected to be more effective in controlling runoff, erosion and nutrient losses. One important parameter is the efficiency of the distance of the vertical mulch channel, which affects the application cost. This study was aimed to determine the effect of different distances of vertical mulch channels on the plant growth and annual crop yield as well as its effectiveness in controlling runoff, erosion and nutrient losses. The research was conducted in Carita Research Forest from 2005 to 2008, using the randomized block design. Treatments applied were: vertical mulch with six and twelve meter distances of plots of khaya (C.Dc.) and corn (L.) cropping system. Observations included height and diameter growth of khaya, runoff and erosion, and cost per ha. The results showed that six meter of vertical mulch was the most efficient distance. The height and diameter of khaya tree increased by 7% and 31% in six meter distance compared to the control. Moreover, runoff and erosion was reduced by 75% and 37%, and nutrient losses could be trimmed down by three to five times. In addition, six meters distance could also produce corn of 712 kg/ha/year, which was 73% greater than corn production without vertical mulch. On the other hand, the cropping system with six meter distance of vertical mulch required Rp 3,250,000,-per ha, which was Rp 250,000,-more expensive than that without vertical mulch.

Jurnal Penelitian Hutan dan Konservasi Alam, 2012

Mahogany is a potential species commonly cultivated in West Java. The community usually plants th... more Mahogany is a potential species commonly cultivated in West Java. The community usually plants this species in a cropping system with combinations of agricultural crops. Topography, climate, and intensive soil preparation affect on vulnerability of land productivity due to severe runoff and erosion impact on growth and crop production. This condition can be controlled by applying soil conservation techniques such as vertical mulch to reduce runoff and erosion as well as to maintain soil fertility. Eficiency of vertical mulch channel distance is needed to reduce the application cost. This research aims to determine the effect of different distances of vertical mulch channels on mahogany growth and maize production as wel as its effectiveness in controlling runoff , erosion, and nutrient loss. The research was conducted at Carita Forest Research in year 2005-2008 using a randomized block design. Treatment applied was vertical mulch with six and 12 m intervals on the plots of mahogany (Swietenia macrophylla King) and maize (Zea mays L.) cropping system. Observations include height and diameter growth of mahogany, runoff and erosion, and cost required for one hectare area. The result showed that six meter intervals of vertical mulch increased the height and diameter growth of mahogany by 25% and 66% respectively compared to the control. That treatment also reduced runoff and erosion by half, and nutrient loss due to runoff and erosion were reduced up to three and five times respectively. Application of the six meter interval on the mahogany cropping system produced 581 kg/ha/year maize or 47% higher instead of control, and in a hectare the cropping system will require Rp 3,250,000 or more expensive Rp 250,000 compared to control.

Jurnal Penelitian Hutan Tanaman, 2019

Degraded land in the Carita Research Forest, West Java is commonly found in slopes. As a result, ... more Degraded land in the Carita Research Forest, West Java is commonly found in slopes. As a result, erosion, runoff and nutrient loss often occur in this area. To address these problems, the application of soil and water conservation techniques with a vertical mulch technique is required. The aim of the study was to determine the effect of vertical mulch treatment on the amount of runoff, erosion, nutrient loss and also its impact on the growth of S. johorensis, G. gnemon, and P. speciosa. The results showed that soil and water conservation techniques with vertical mulch are very effective in reducing runoff, erosion and nutrient losses (N, P, K, Ca and Mg). The vertical mulch of mixed planting pattern between S. johorensis and G. gnemon could decrease the surface run off and erosion by 61.74% and 57.14%, respectively, while the mixture of S. johorensis and P. speciosa decreased the runoff and erosion rate equal to 81.39% and 17.64%, respectively. In addition, the use of vertical mulch could also increase the growth of the tree species until the age of 3 years in the field compared to those without treatment.

Jurnal Penelitian Hutan Tanaman, 2012

Biodiversitas Journal of Biological Diversity, 2020

Shorea macrophylla is a tree species in Tane' Olen forest area. This study analyzed the soil's ph... more Shorea macrophylla is a tree species in Tane' Olen forest area. This study analyzed the soil's physical and chemical properties, topography, and microclimate of S. macrophylla's habitat. A purposive method was used to select a sampling plot and to place the subplots. Soil was analyzed to determine the physical properties, i.e., texture, bulk density, porosity, and water content, and the chemical properties, i.e., pH, CEC, total N, organic C, C/N ratio, P, K , and Al saturation. Importance value index was determined for each tree species to know the species composition in the study site. Only the dominant species were presented. The soil at the study site had bulk density of 0.60-1.31 gram cm³-1 , porosity 50.60%-77.35%, water content 34.88%-95.37%, and soil texture sandy clay. The chemical properties of the soil were as follows:

Jurnal Penelitian Hutan dan Konservasi Alam, 2008

Rehabilitation of critical land in Timor Barat should be done with holistic approach considering ... more Rehabilitation of critical land in Timor Barat should be done with holistic approach considering socio economic and cultural aspect. The problems of forest and land rehabilitation effort in this area are: poverty, less job opportunity, and high dependency on dry farm agriculture and animal husbandry. The rate of critical land in several watershed such as Benain Noelmina in Timor Barat is very high. Therefore, the approach of land rehabilitation should integrated and more specific. This research is intended to gain the information on land rehabilitation alternative through the development of community forest based on mamar system. Methods used on this research were survey on biophysics of mamar and interview with villagers, village administrators, and custom leaders. The results showed that mamar system could be developed as a community forest model to support land rehabilitation program. The benefit of applying this system is that the management of critical land will be based on local inisiative which is suitable with land characteristics, socio culture and indigenous knowledge, therefore it can increase people participation to reach the purpose of forest and land rehabilitation.

Jurnal Penelitian Hutan dan Konservasi Alam, 2007

Tangkuban Parahu Natural Recreation Park is one of natural recreation parks which has very typica... more Tangkuban Parahu Natural Recreation Park is one of natural recreation parks which has very typical creater and mountaineus vegetation. Therefore this area is often visited by tourists. The vegetation type in is the park the result of several component in this ecosystem, such as soil, climate, etc. Specific soil characteristics of the area may influence composition of the vegetation down to the type of dominant species. This research was aimed to know soil characteristics and vegetation composition in the Tangkuban Parahu Natural Recreation Park. According to the above background, this research dealt with the soil characteristics and vegetation composition in the Tangkuban Parahu Natural Recreation Park. Several plots were made in order to see the vegetation composition as well as soil characteristics. The result of this research indicated that in the research location, the soil type was Andosol with typical mountaineous vegetation.

Jurnal Penelitian Hutan dan Konservasi Alam, 2007

Forest plantation development generally is directed to improve marginal land with Oxisols and Ult... more Forest plantation development generally is directed to improve marginal land with Oxisols and Ultisols. These soils are very sensitives to erosion and have very low fertility. In the first three years after planting, development of forest plantation usually has some problems such as: high erosion rate due to runoff , especially in steep slope areas. Therefore forest plantation management has to consider soil and water conservation. This research was designed to evaluate runoff and erosion rates in several forest plantations (Aleurites moluccana (L.) Willd., Khaya anthoteca C.DC., Acacia mangium Willd., and Shorea johorensis Foxw.). Plots were set to investigate runoff and erosion on these forest plantations. Results of this research showed that runoff and erosion decreased by increasing stands age and depend also on slope, soil types, vegetation cover, etc. It is expected that results of this research could be used as a reference in the policy decision making concerning to the forest and land rehabilitation program.

Jurnal Penelitian Hutan dan Konservasi Alam, 2012

Mining sector has been playing an important role as one of the biggest contributor for national i... more Mining sector has been playing an important role as one of the biggest contributor for national income. Due to the surface mining which has been generally adopted in mining system in Indonesia, soil surface and landscape mostly damaged flora and fauna habitat mostly changed, landscape stability and hidrology system altered. When post-mining site is not managed properly, the on site and off site mining area will be affected. This happened in copper mining, as in Bangka, the post-mining site has left tailing areas in form of quartzitic sands and overburden compounds. The fertility level of the post-copper mining in the tailing area was generally very low. Post-copper mining sites generally have high level of quartzitic sands, therefore the poor soil fertility due to low buffer capacity for nutrients. The purpose of this research was to collect data and information about quartzitic sands tailing usage as plant medium in nursery, specifically the effective dosage to support the growth of Eucalyptus urophylla and Anthocephalus cadamba in nursery. The research was carried out at PT. Kobatin-Central Bangka in 2010 to study the addition of fertilizer and fixing substances in various concentration to media for E. urophylla and A. cadamba. The results indicated that the plants planted on media containing 20% organic matter, 20% top soil, 5% lime, 1% NPK (fertilizer), and 54% post-copper mining tailing (quartzitic sands) showed enhance both tree species seedlings well growth.

Jurnal Penelitian Hutan dan Konservasi Alam, 2013

High rainfall and soil tillage without application of soil conservation have led to higher run of... more High rainfall and soil tillage without application of soil conservation have led to higher run off and erosion that washed away top soil that is rich in nutrients. This study was aimed to determine the effect of soil and water conservation techniques (silt pit) on Gmelina arborea Roxb planting. KHDTK Carita. The design experiment was arranged following randomized block design.Three treatments were applied, namely P 5 = G. arborea + silt pit with 5 m distance; P 10 = G. arborea + silt pit with 10 m distance, and P 0 = G. arborea + without silt pit (control). Plant growth was analyzed using ANOVA, and for the other parameters were analyzed descriptively. The results showed that the best G. arborea growth was reached at P 5 treatment with average height and diameter of 10.07 m and 13.21 cm, respectively. At the third years, P 5 and P 10 treatment significantly affected plant height while the diameter was only influenced by P 5. P 5 treatment was also able to suppress run off and erosion by 2.07% and 13.56%, respectively, compared to the control. Nutrient loss by erosion was greater than by surface run off, and nutrient loss on P 5 had the least when compared to P 10 and P 0 .

Indonesian Journal of Forestry Research, 2011

Agarwood is produced from certain infected tree species that grow prevalently in tropical area an... more Agarwood is produced from certain infected tree species that grow prevalently in tropical area and generally originated from genus and which are classified in Thymeleaceae family. Genus of consists of 15 species, growing on particular sites of tropical Asia such as India,

Jurnal Penelitian Hutan dan Konservasi Alam, 2012

Forest and land rehabilitation is very important, in order to ensure the needs of timber and also... more Forest and land rehabilitation is very important, in order to ensure the needs of timber and also to improve environmental conditions. Up to now the success of land and forest rehabilitation is still very low. Therefore several efforts are needed, especially in trees species selection that will be developed including its land suitability. One approach is to determine the land suitability of tree species by conducting a study on trees that have potential and economic value, which is supported by its distribution in accordance with requirements of its growth. The economically valuable trees species were molded in digitized land suitability map. The purpose of this study was to provide a map of trees species suitability in Pemali Jratun Watershed, Central Java. Land Suitability maps were obtained by matching of all trees growth requirement, with soil, topographic and climate (precipitation) maps. It is expected that this information could be considered as a basis for developing policies and strategies especially for Pemali Jratun watershed rehabilitation.

Jurnal Penelitian Hutan dan Konservasi Alam, 2014

The success of tree planting especially in critical lands, depend on several factors such as spec... more The success of tree planting especially in critical lands, depend on several factors such as species selection suitability, planting objective, land preparation, etc. The aim of this study was to obtain data and information on suitable tree species potentially used in critical land of Lesti Sub Watershed, East Java and visualized in a map. Suitable tree species map was produced by matching tree growth requirements to the condition of soil, topography, climate (precipitation,) and critical land map. It is expected that this information could be used as a consideration in land rehabilitation planning of Lesti Sub Watershed based on critical land level priority.

Journal of Degraded and Mining Lands Management, 2016

Tin mining activities in Bangka Island, besides their important role in contributing to state rev... more Tin mining activities in Bangka Island, besides their important role in contributing to state revenues, also caused damage to the environment, among others in the form of quartz tailings overlay. To rehabilitate this land, in addition to the necessary efforts to improve soil conditions, success is also determined by the selection of appropriate plant species. This study was aimed to determine the adaptability of some legume trees grown on the quartz tailings in land rehabilitation trials in the post tin mining areas of Bangka Island. The legume trees tested were Calliandra calothyrsus Meisn., Caesalpinia sappan L., Enterolobium cyclocarpum (Jacq.) Griseb., Gliricidia sepium (Jacq.) Walp., Delonix regia (Hook.) Raf., and Cassia siamea Lamk. Treatments of growing media applied in the field were medium I (a mixture of 20% organic material, 20% top soil, 1% NPK fertilizer, 5% calcium, and 54% quartz tailings), media II (a mixture of 25%organic material, 25%top soil, 2% NPK fertilizer, 6% calcium, 42% quartz tailings), and media III (a mixture of 30% organic material, 30% top soil, 3% NPK fertilizer, 7% calcium, and 30% quartz tailings). The observation was done by measuring the height and diameter of the stem of the plants, as well as the viability of one year after planting. Analysis of the results of measurements of stem height and diameter showed their diversity. Enterolobium cyclocarpum had the largest dimensions, while the lowest was Caesalpinia sappan. At the age of one year in the field, Gliricida sepium and Enterolobium cyclocarpum showed the average ability of the high life of up to 100%, whereas Calliandra calothyrsus was totally death. In general, the types of legumes selected in this trial showed good adaptability, except for of Calliandra calothyrsus.

Indonesian Journal of Forestry Research, 2012

Encroachments on Carita Research Forest area have exacerbated the degradation of land due to unco... more Encroachments on Carita Research Forest area have exacerbated the degradation of land due to uncontrolled runoff, erosion and nutrient losses especially on the sloping land with high annual rainfall. To reduce the severity of the degradation the area should be rehabilitated by applying soil and water conservation techniques. The techniques used were the vegetative methods (culture), and a combination of it with mechanical/technical methods. The combination method is expected to be more effective in controlling runoff, erosion and nutrient losses. One important parameter is the efficiency of the distance of the vertical mulch channel, which affects the application cost. This study was aimed to determine the effect of different distances of vertical mulch channels on the plant growth and annual crop yield as well as its effectiveness in controlling runoff, erosion and nutrient losses. The research was conducted in Carita Research Forest from 2005 to 2008, using the randomized block design. Treatments applied were: vertical mulch with six and twelve meter distances of plots of khaya (C.Dc.) and corn (L.) cropping system. Observations included height and diameter growth of khaya, runoff and erosion, and cost per ha. The results showed that six meter of vertical mulch was the most efficient distance. The height and diameter of khaya tree increased by 7% and 31% in six meter distance compared to the control. Moreover, runoff and erosion was reduced by 75% and 37%, and nutrient losses could be trimmed down by three to five times. In addition, six meters distance could also produce corn of 712 kg/ha/year, which was 73% greater than corn production without vertical mulch. On the other hand, the cropping system with six meter distance of vertical mulch required Rp 3,250,000,-per ha, which was Rp 250,000,-more expensive than that without vertical mulch.

Jurnal Penelitian Hutan dan Konservasi Alam, 2012

Mahogany is a potential species commonly cultivated in West Java. The community usually plants th... more Mahogany is a potential species commonly cultivated in West Java. The community usually plants this species in a cropping system with combinations of agricultural crops. Topography, climate, and intensive soil preparation affect on vulnerability of land productivity due to severe runoff and erosion impact on growth and crop production. This condition can be controlled by applying soil conservation techniques such as vertical mulch to reduce runoff and erosion as well as to maintain soil fertility. Eficiency of vertical mulch channel distance is needed to reduce the application cost. This research aims to determine the effect of different distances of vertical mulch channels on mahogany growth and maize production as wel as its effectiveness in controlling runoff , erosion, and nutrient loss. The research was conducted at Carita Forest Research in year 2005-2008 using a randomized block design. Treatment applied was vertical mulch with six and 12 m intervals on the plots of mahogany (Swietenia macrophylla King) and maize (Zea mays L.) cropping system. Observations include height and diameter growth of mahogany, runoff and erosion, and cost required for one hectare area. The result showed that six meter intervals of vertical mulch increased the height and diameter growth of mahogany by 25% and 66% respectively compared to the control. That treatment also reduced runoff and erosion by half, and nutrient loss due to runoff and erosion were reduced up to three and five times respectively. Application of the six meter interval on the mahogany cropping system produced 581 kg/ha/year maize or 47% higher instead of control, and in a hectare the cropping system will require Rp 3,250,000 or more expensive Rp 250,000 compared to control.

Jurnal Penelitian Hutan Tanaman, 2019

Degraded land in the Carita Research Forest, West Java is commonly found in slopes. As a result, ... more Degraded land in the Carita Research Forest, West Java is commonly found in slopes. As a result, erosion, runoff and nutrient loss often occur in this area. To address these problems, the application of soil and water conservation techniques with a vertical mulch technique is required. The aim of the study was to determine the effect of vertical mulch treatment on the amount of runoff, erosion, nutrient loss and also its impact on the growth of S. johorensis, G. gnemon, and P. speciosa. The results showed that soil and water conservation techniques with vertical mulch are very effective in reducing runoff, erosion and nutrient losses (N, P, K, Ca and Mg). The vertical mulch of mixed planting pattern between S. johorensis and G. gnemon could decrease the surface run off and erosion by 61.74% and 57.14%, respectively, while the mixture of S. johorensis and P. speciosa decreased the runoff and erosion rate equal to 81.39% and 17.64%, respectively. In addition, the use of vertical mulch could also increase the growth of the tree species until the age of 3 years in the field compared to those without treatment.

Jurnal Penelitian Hutan Tanaman, 2012

Biodiversitas Journal of Biological Diversity, 2020

Shorea macrophylla is a tree species in Tane' Olen forest area. This study analyzed the soil's ph... more Shorea macrophylla is a tree species in Tane' Olen forest area. This study analyzed the soil's physical and chemical properties, topography, and microclimate of S. macrophylla's habitat. A purposive method was used to select a sampling plot and to place the subplots. Soil was analyzed to determine the physical properties, i.e., texture, bulk density, porosity, and water content, and the chemical properties, i.e., pH, CEC, total N, organic C, C/N ratio, P, K , and Al saturation. Importance value index was determined for each tree species to know the species composition in the study site. Only the dominant species were presented. The soil at the study site had bulk density of 0.60-1.31 gram cm³-1 , porosity 50.60%-77.35%, water content 34.88%-95.37%, and soil texture sandy clay. The chemical properties of the soil were as follows:

Jurnal Penelitian Hutan dan Konservasi Alam, 2008

Rehabilitation of critical land in Timor Barat should be done with holistic approach considering ... more Rehabilitation of critical land in Timor Barat should be done with holistic approach considering socio economic and cultural aspect. The problems of forest and land rehabilitation effort in this area are: poverty, less job opportunity, and high dependency on dry farm agriculture and animal husbandry. The rate of critical land in several watershed such as Benain Noelmina in Timor Barat is very high. Therefore, the approach of land rehabilitation should integrated and more specific. This research is intended to gain the information on land rehabilitation alternative through the development of community forest based on mamar system. Methods used on this research were survey on biophysics of mamar and interview with villagers, village administrators, and custom leaders. The results showed that mamar system could be developed as a community forest model to support land rehabilitation program. The benefit of applying this system is that the management of critical land will be based on local inisiative which is suitable with land characteristics, socio culture and indigenous knowledge, therefore it can increase people participation to reach the purpose of forest and land rehabilitation.

Jurnal Penelitian Hutan dan Konservasi Alam, 2007

Tangkuban Parahu Natural Recreation Park is one of natural recreation parks which has very typica... more Tangkuban Parahu Natural Recreation Park is one of natural recreation parks which has very typical creater and mountaineus vegetation. Therefore this area is often visited by tourists. The vegetation type in is the park the result of several component in this ecosystem, such as soil, climate, etc. Specific soil characteristics of the area may influence composition of the vegetation down to the type of dominant species. This research was aimed to know soil characteristics and vegetation composition in the Tangkuban Parahu Natural Recreation Park. According to the above background, this research dealt with the soil characteristics and vegetation composition in the Tangkuban Parahu Natural Recreation Park. Several plots were made in order to see the vegetation composition as well as soil characteristics. The result of this research indicated that in the research location, the soil type was Andosol with typical mountaineous vegetation.

Jurnal Penelitian Hutan dan Konservasi Alam, 2007

Forest plantation development generally is directed to improve marginal land with Oxisols and Ult... more Forest plantation development generally is directed to improve marginal land with Oxisols and Ultisols. These soils are very sensitives to erosion and have very low fertility. In the first three years after planting, development of forest plantation usually has some problems such as: high erosion rate due to runoff , especially in steep slope areas. Therefore forest plantation management has to consider soil and water conservation. This research was designed to evaluate runoff and erosion rates in several forest plantations (Aleurites moluccana (L.) Willd., Khaya anthoteca C.DC., Acacia mangium Willd., and Shorea johorensis Foxw.). Plots were set to investigate runoff and erosion on these forest plantations. Results of this research showed that runoff and erosion decreased by increasing stands age and depend also on slope, soil types, vegetation cover, etc. It is expected that results of this research could be used as a reference in the policy decision making concerning to the forest and land rehabilitation program.

Jurnal Penelitian Hutan dan Konservasi Alam, 2012

Mining sector has been playing an important role as one of the biggest contributor for national i... more Mining sector has been playing an important role as one of the biggest contributor for national income. Due to the surface mining which has been generally adopted in mining system in Indonesia, soil surface and landscape mostly damaged flora and fauna habitat mostly changed, landscape stability and hidrology system altered. When post-mining site is not managed properly, the on site and off site mining area will be affected. This happened in copper mining, as in Bangka, the post-mining site has left tailing areas in form of quartzitic sands and overburden compounds. The fertility level of the post-copper mining in the tailing area was generally very low. Post-copper mining sites generally have high level of quartzitic sands, therefore the poor soil fertility due to low buffer capacity for nutrients. The purpose of this research was to collect data and information about quartzitic sands tailing usage as plant medium in nursery, specifically the effective dosage to support the growth of Eucalyptus urophylla and Anthocephalus cadamba in nursery. The research was carried out at PT. Kobatin-Central Bangka in 2010 to study the addition of fertilizer and fixing substances in various concentration to media for E. urophylla and A. cadamba. The results indicated that the plants planted on media containing 20% organic matter, 20% top soil, 5% lime, 1% NPK (fertilizer), and 54% post-copper mining tailing (quartzitic sands) showed enhance both tree species seedlings well growth.

Jurnal Penelitian Hutan dan Konservasi Alam, 2013

High rainfall and soil tillage without application of soil conservation have led to higher run of... more High rainfall and soil tillage without application of soil conservation have led to higher run off and erosion that washed away top soil that is rich in nutrients. This study was aimed to determine the effect of soil and water conservation techniques (silt pit) on Gmelina arborea Roxb planting. KHDTK Carita. The design experiment was arranged following randomized block design.Three treatments were applied, namely P 5 = G. arborea + silt pit with 5 m distance; P 10 = G. arborea + silt pit with 10 m distance, and P 0 = G. arborea + without silt pit (control). Plant growth was analyzed using ANOVA, and for the other parameters were analyzed descriptively. The results showed that the best G. arborea growth was reached at P 5 treatment with average height and diameter of 10.07 m and 13.21 cm, respectively. At the third years, P 5 and P 10 treatment significantly affected plant height while the diameter was only influenced by P 5. P 5 treatment was also able to suppress run off and erosion by 2.07% and 13.56%, respectively, compared to the control. Nutrient loss by erosion was greater than by surface run off, and nutrient loss on P 5 had the least when compared to P 10 and P 0 .

Indonesian Journal of Forestry Research, 2011

Agarwood is produced from certain infected tree species that grow prevalently in tropical area an... more Agarwood is produced from certain infected tree species that grow prevalently in tropical area and generally originated from genus and which are classified in Thymeleaceae family. Genus of consists of 15 species, growing on particular sites of tropical Asia such as India,

Jurnal Penelitian Hutan dan Konservasi Alam, 2012

Forest and land rehabilitation is very important, in order to ensure the needs of timber and also... more Forest and land rehabilitation is very important, in order to ensure the needs of timber and also to improve environmental conditions. Up to now the success of land and forest rehabilitation is still very low. Therefore several efforts are needed, especially in trees species selection that will be developed including its land suitability. One approach is to determine the land suitability of tree species by conducting a study on trees that have potential and economic value, which is supported by its distribution in accordance with requirements of its growth. The economically valuable trees species were molded in digitized land suitability map. The purpose of this study was to provide a map of trees species suitability in Pemali Jratun Watershed, Central Java. Land Suitability maps were obtained by matching of all trees growth requirement, with soil, topographic and climate (precipitation) maps. It is expected that this information could be considered as a basis for developing policies and strategies especially for Pemali Jratun watershed rehabilitation.