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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:  
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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: |
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: |
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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, รองศาสตราจารย์ , 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:ผลผลิตของไม้ฟืนขนาดเล็กจากการตัดสางขยายระยะสวนป่าไม้ยูคาลิปตัส คามาลดูเลนซิส ผู้เขียน:นายพงษ์ศักดิ์ สหุนาฬุ, ศาสตราจารย์, Bunyarit Puriyakorn, นายปรีชา ธรรมานนท์, รองศาสตราจารย์, Pithaya Hiranpan สื่อสิ่งพิมพ์:pdf Abstract The study on production of small size fuelwood from thining of Eucalyptus camaldulensis Dehnh. plantation was conducted at Ratchaburi Forest Experiment Station, Amphoe Muang, Ratchaburi Province, from June 1984 to June 1985 by selecting sample plots of 3 – year – old E. camaldulensis plantation with 1 x 1, 1 x 2 and 2 x 2 m spacing using 4, 4 and 2 replications respectively. The diameter at 1.30 m from the ground level of each tree was measured. Trees in two out of four plots of 1 x 1 and 1 x 2 m spacing were thinned in alternate rows so the spacing of the tree become 1 x 2 and 2 x 2 m respectively. The diameter at ground level ( Do ), at 1.30 m from ground level ( D ) and total height ( H ) of the sprouts were recorded after 4, 8 and 12 months of the thinning . Tree biomass was estimated before thinning and 1 year after thinning by allometric relation with D2H as independent variable Sprout biomass (4, 8 and 12 months after thinning ) was estimated by allometric relation with D2H as independent variable. Tree biomass increment of each plot was analysed, whereas biomass of the thinned trees was calculated. Small size fuelwood production from thinning and from coppice, the duration which biomass of the sprout and the unthinned tree would equal that of the thinned, the suitable stump size which can produce good coppice, percentage of survival sprout and the income from production of small size fuelwood after the third and fourth year were studied. The results of the study showed that the biomass of 3 an d4 year – old E. camaldulensis in the 1x2 m control plot was the greatest followed by those in the 1x1 and 2x2 m control plot respectively. The increment of thinned plots in 1 x1 and 1 x 2 m was higher than that of the control. The increment of plot under thinning alternative I ( 1 x 1 1 x 2 m ) was higher than that of plot under thinning alternative I (1 x 1 2 x 2 m ). Larger stumps produced better coppice than smalled ones. The growth rate of the sprout in the plots under thinning alternative I and II showed no difference after 4 months of thinning but after 8 and 12 months the growth rate of plot under thinning alternative I was higher. The survival percentage of the erect sprout in plot under thinning alternative I was higher than that of plot under thinning alternative II but the creeping sprout of the two plots would dieback after 4 months. After thinning, sprouts and remaining trees in the plot under thinning alternative I produced biomass more rapidly than those in the plot under thinning alternative II. Procution of small size fuelwood from thinning after 3 years old in the plots under thinning alternative I and II were 165,579 and 11,724 bundle/hectare, of equal to the income of 2,652.63 an d1875.81 baht/rai. After the fourth year, production of plots under thinning alternative I and II were 40,859 and 25,020 bundle/hectare or equal to the income of 6,537.44 and 4,003.21 baht/rai by excluding the operational expenses. |
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 Researcherดร. นิคม แหลมสัก, ผู้ช่วยศาสตราจารย์ที่ทำงาน:ภาควิชาวนผลิตภัณฑ์ คณะวนศาสตร์ บางเขน สาขาที่สนใจ:Wood Composite Technology, Wood Utilization, Wood Energy and Biorefineries, Wood Products Marketing Resume |
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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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