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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. |
 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Preliminary Study on the Transpiration Rate of Tropical Tree Species in Thailand) ผู้เขียน:นายปรีชา ธรรมานนท์, รองศาสตราจารย์,  Mamoru Kanzaki, นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์, Ladawan Atipanumpai สื่อสิ่งพิมพ์:pdf AbstractThe diffusive resistance and the transpiration rates of 35 species, both exotic and indigenous were measured at four study sites throughout Thailand. The diurnal changes of transpiration rate were observed from morning to evening. The diffusive resistance of most species temporally increased around noon. The transpiration rate fluctuated remarkably with the Photosynthetic Photon Flux Density (PPFD). The effect of leaf ages and the upper and the lower surfaces of leaf on the transpiration rates were discussed. Water consumption in stand level and the transpiration ratio were calculated for E. camaldulensis and A. mangium. E. camaldulensis showed higher water consumption but lower transpiration ratio based on stem biomass compared to A. mangium. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Botryodiplodia Stem End Rot of Mango and Its Control) ผู้เขียน:นายปรีชา ธรรมานนท์, รองศาสตราจารย์, นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractBotrydiplodia theobromae, the causal organism of stem end rot disease of mango was studied. Isolates of B. theobromae obtained from different sources had different degree of disease severity. Isolate from diseased mango fruit was whe most virulent isolate. Six cultivars of mango were tested on their susceptibility. Okrong was the most susceptible cultivar. Length of pedicel also had an effect on disease development. Disease developed slower on the fruit with longer pedicel than on the shorter one. Control measure of the disease with different means indicated that dipping the fruits in benomyl at concentration of 500 ppm at 52 C for 5 minutes was the most effective mean. |
 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: |
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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: |
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: |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : The Forest Regeneration after Gregarious Flowering of Bamboo (Cephalostachyum pergracile) at Mae Klong Watershed Research Station, Kanchanaburi) ผู้เขียน:ดร.ดอกรัก มารอด, ศาสตราจารย์ , Veerasak Neumrat, Samroeng Panuthai, Tanaka Hiroshi, นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe forest regeneration after gregarious flowering bamboo (Cephalostachyum pergracile) in the Mixed deciduous forest was carried out at Mae Klong Watershed Research Station, Kanchanaburi Province in 2002. A permanent plot of 50 m ? 50 m was established and the 24 litter traps with mouth size of 0.5 m2, each adjacent to a seedling quadrat (1.5 m ? 1.5 m) were set in a regular matrix with 10 m distance between each one. Seedling census was done every two weeks. At each census all new tree and bamboo seedlings were tagged, identified and seedling mortality were also recorded. The results showed that the forest structure was dominated by undergrowth bamboo in the middle layer. Cephalostachyum pergracile had gregarious flowered in November 2001 which had the clump and culm density as 0.06 m-2 and 11.10 clump-1, while, the average seed production was 2,442 ? 1,243 seed/m2. Forest fire occurred after bamboo died and burnt all above ground parts of them in which they provided large vacant spaces to forest regeneration. Both forest tree regeneration and bamboo dynamics showed high corresponded to soil moisture content. The annual survival rate of bamboo seedlings was quite high, 58 %, with the annual average of growth height rate about 22.8?1.45 cm. The seedling emergence of dominance species was very high rate, especially in the first year after bamboo died and followed by forest fire. Thus, both the bamboo undergrowth and frequent forest fires could be the dominant factors that prevent the continuous of forest regeneration. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Characerization of the Nuclear Polyhedrosis Virus of the Cotton Bollworm, Heliothis armigera) ผู้เขียน:นายปรีชา ธรรมานนท์, รองศาสตราจารย์, นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe nuclear polyhedrosis virus (NPV) was is isolated from the cotton bollworm, Heliothis armnigera found in Thailand. Ultrastructural studies revealed the virus of single embedded type with the characteristic symptoms of the NPV infection. The virus inclusion bodies (polyhedra) varied considerably in shape ranging from spherical to cuboidal with the sizes of 0.98 um. The virions and nucleocapsids were rod-shaped with the mean width and length of 72.79 x 354.79 nm. And 30.13 x 276.87 nm. Respectively. Virus propagation was achieved by os inoculation of the third instar larvae with the preparation of polyhedra. The polyhedra were extracted from infected larvae and purified by low speed centrifugation. Virus particles were released from polyhedra by sodium bicarbonate dissolution. The viral nucleic acid, extracted by phenol: chloroform treatment and precipitated by absolute ethyl alcohol, had a 260/280-nm. Ratio of 2..01. Nucleic acid type was confirmed by DNase and RNase treatments. Digestion of the DNA genome with EcoRI, Hind II, PstI, SacII, HpaI and SacI showed specific restriction endonuclease cleavage patterns. Pre- liminary analysis of restriction endonuclease profiles indicated a molecular weight of approximately 65 x 106 for this viral DNA. |
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