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 ผลงานตีพิมพ์ในวารสารวิชาการAntibiotic resistance profiles of soil bacterial communities over a land degradation gradientผู้แต่ง: Doi, R,  Mr.Pongsak Sahunalu, Professor , Wachrinrat, C, Dr.Sakhan Teejuntuk, Assistant Professor , Sakurai, K, วารสาร:  
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ผลงานตีพิมพ์ในวารสารวิชาการSemiquantitative color profiling of soils over a land degradation gradient in Sakaerat, Thailandผู้แต่ง:Doi, R, Wachrinrat, C, Dr.Sakhan Teejuntuk, Assistant Professor, Sakurai, K, Mr.Pongsak Sahunalu, Professor, วารสาร: |
ผลงานตีพิมพ์ในวารสารวิชาการHabitat divergence in sympatric Fagaceae tree species of a tropical montane forest in northern Thailandผู้แต่ง:Noguchi, Hideyuki, Itoh, Akira, Mizuno, Takashi, Sri-Ngernyuang, Kriangsak, Kanzaki, Mamoru, Dr.Sakhan Teejuntuk, Assistant Professor, Sungpalee, Witchaphart, Hara, Masatoshi, Ohkubo, Tatsuhiro, Mr.Pongsak Sahunalu, Professor, Mr.Pricha Dhanmanonda, Associate Professor, Yamakura, Takuo, วารสาร: |
ผลงานตีพิมพ์ในวารสารวิชาการIntra- and interspecific variation in wood density and fine-scale spatial distribution of stand-level wood density in a northern Thai tropical montane forestผู้แต่ง:Sungpalee, W, Itoh, A, Kanzaki, M, Sri-Ngernyuang, K, Noguchi, H, Mizuno, T, Dr.Sakhan Teejuntuk, Assistant Professor, Hara, M, Chai-Udom, K, Ohkubo, T, Sahunalu, P, Dhanmmanonda, P, Nanami, S, Yamakura, T, Sorn-Ngai, A, วารสาร: |
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ที่มา:วารสารการจัดการป่าไม้หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Stand Structure and Species Composition in the Long-term Dynamic Plots of Sakaerat Deciduous Dipterocarp Forest, Northeastern Thailand) ผู้เขียน:นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractStand structure and species composition were analyzed in 4 stands, each 1 ha square plot established for the long-term forest dynamic studies in Sakaerat deciduous dipterocarp forest (SDDF) in 1894. All 4 stands exhibit their stand structural organization as being open and less crown overlapping among the canopy tree species. The stands are identified as having considerable large canopy gap. The forest canopy is stratified into 2 layers in stand 1 and 3; and 3 layers in stand 2 and 4 in this forest type. The stands are dominated by tree species belonging to Dipterocarpaceae family and being co-occurrence with several tree species in other families. Stand density of trees (DBH ? 4.5 cm) in the 4 stands varies from 555 to 823 trees.ha-1. Species composition ranges from 32 to 37 species, average tree height from 7.48 to 12.08 m, total basal area from 14.52 to19.11 m2.ha-1. Species diversity as determined by Shannon-Weiner’s index varies from 1.980 to 2.732. These stand parameters are recorded and used as the baseline information for future long-term study on their dynamics. The different 4 stands are classified basing on the highest and the next following importance value index (IVI) of the leading two co-occurring tree species as 4 association types: (1) Shorea roxburghii-Quercus kerrii, (2) Shorea obtusa-Shorea siamensis, (3) Shorea obtusa- Pterocarpus macrocarpus and (4) Shorea siamensis-Shorea roxburghii association types in stands1, 2, 3, and 4 respectively. |
ที่มา:วารสารการจัดการป่าไม้หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Spatial Distribution and Size Structure Patterns of Tree Species in the Long-term Dynamic Plots of Sakaerat Deciduous Dipterocarp Forest, Northeastern Thailand) ผู้เขียน:นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractAll tree individuals (DBH ? 4.5 cm) in the 4 stands of each 1 ha square plots in Sakaerat deciduous dipterocarp forest (SDDF) established for the long-term dynamic studies were investigated to clarify their spatial distributional patterns in forms of I-delta (I?) index following the Morisita’s procedure by several quadrat size expansions. Frequency distribution of tree individuals in each DBH class (5 cm interval) or size structure distributional pattern in the 4 stands were also analyzed and two negative function models (power function and exponential function) were tested to get the best fit of the two models. Results of the studies reveal that most of the major tree species in the 4 stands are found to distribute in clumping pattern by showing I? values above 1, while the overall individuals in every stands are in random pattern with I? values closed to 1, regardless of any plot size enlargement. Size structure of all tree individuals in this forest is found to display an explicit form of the negative exponential pattern explaining its relatively stable size structure even though they are quite sparsely distributed in each stand. Some dominant tree species in all 4 stands are found to have both L and B-shaped distributional patterns of size structure except for the rest ones that no specific patterns are found in this SDDF type. |
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 หัวเรื่อง:ความหลากชนิดของไม้ยืนต้นในป่าเต็งรังที่สะแกราช จ.นครราชสีมา 1. ความผันแปรและการเปลี่ยนแปลงของความหลากชนิด ผู้เขียน:นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractStudy on variations and dynamics of species diversity of trees (DBH ? 4.5 cm) was carried out in 4 sub-types of dry dipterocarp forest at Sakaerat, Nakornratchasima Province. Variance analysis of Shannon-Wiener index’s H of the four stands and it’s relationship to other indices of species diversity, evenness and richness were studied and vompared to the dry evergreen forest in the same location and to the secondary and primary dry dipterocarp forests at Somdet, Kalasin Province. The study revealed that various indices were significantly correlated with H and enabling the indirect estimation of each index by using H as an independent variable. In the onset of study, it was found that the species diversity index (H) of the four stands were significantly different but H of Shorea floribunda-Quercus kerrii dominant stand was not significantly different from those in dry evergreen forest and primary dry dipterocarp forest at Somdet. H of stand dominated by Shorea obtusa-Pterocarpus macrocarpus was not different from the secondary dry dipterocarp forest. Monitoring of species diversity of Sakaerat dry dipterocarp forest for 9 years and dry evergreen forest for 11 years at Sakaerat and the primary and secondary dry dipterocarp forests at Somdet for 5 years suggested that Shorea obtuse-Pterocarpus macrocarpus dominant stand increased it’s species diversity significantly while other stand were positively or negatively changed more or less but not significantly observed. |
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ที่มา:วารสารการจัดการป่าไม้หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : นัยของการจัดการผลผลิตมวลชีวภาพและการเก็บสะสมคาร์บอนในสวนป่าไม้ยูคาลิปตัส คามาลดูเลนซีสที่ปลูกในที่ดินรกร้าง 3 ประเภท ในประเทศไทย) ผู้เขียน:นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractManagement implication in biomass production and carbon sequestration in E. camaldulensis plantations planted on 3 wasteland types in Thailand was carried out at Takuapa wasteland after tin mining on the sand deposit soils, Ratchaburi wasteland after an over-cutting trees for small-sized firewood production and on lateritic soils and at Somdet wasteland abandoned after slashing and burning forest land for cassava planting and on sandy loam soils. Various experimental treatments were applied for planting this tree species and growth together with survival of trees were recorded periodically for 8 periods in each site for all nearly 5 years. The investigations included the biomass production in response to the treatments applied and change with the stand ages along with the estimation of carbon sequestration in total biomass production of this tree species. The results of investigation suggested that biomass production of this tree species varied correspondingly to the treatments applied in different site quality of the wasteland and stand ages due to the difference in soil fertility conditions in the 3 wasteland types and in 3 sites by which they were in the range of very infertile to the moderate ones in sand deposit, lateritic and sandy loam soils respectively. The appropriate treatments suggested for ameliorating these wastelands besides the plowing prior to tree transplanting in every sites, mulching with Imperata cylindrica grass elevated biomass production to be better than other treatments as well as mixing slime with chemical fertilizer and compost filled into the planting holes exhibited the largest biomass production in sand deposit soils of wasteland after tin mining at Takuapa. Biomass production of this tree species on wasteland with lateritic soils at Ratchaburi highly varied due to the heterogeneous distribution of laterite in soil horizon, however intercropping with some agronomic crops as well as mixed planting in alternate rows with some slow growing tree species, demonstrated the best biomass production in this wasteland type as the former treatment was helpful by frequent hoe plowing and the latter one was beneficial from the wide planting space. On the wasteland with sandy loam soils at Somdet, narrow planting space or high stand density provided the greatest biomass production as compared to other treatments. The investigation was carried out further to obtain the management options by finding out the optimal rotation length for regulating the biomass production for economic benefit and other uses. The analyses were achieved from the relationships between biomass accumulation and stand age using a simple logistic growth model together with the CAI and MAI determination in all stands. The analyses were also for enhancing the potential of the sites for biomass production and carbon sequestration due to stand ages. The studies recommended two management options for these plantations as for tree harvesting at the optimal rotation length or for reserving the carbon sequestration sources in the sites for either economic or environmental conservation purposes. Thus, the studies were considered to demonstrate the management implication in biomass production and carbon sequestration starting from tree planting to harvesting for alternative use or reservation of trees planted in the rehabilitation scheme of 3 wasteland types in Thailand. |
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