 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Modeling for Radial Distribution of Sap Flow in Rubber (Hevea brasiliensis Muell. Arg.) Trees) ผู้เขียน: Sumit KUNJET, Philippe Thaler, Pisamai Chuntuma,  ดร.กุมุท สังขศิลา, รองศาสตราจารย์ , ดร.พูนพิภพ เกษมทรัพย์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThis research improved the model for the radial distribution of the sap flux density in rubber trees. The objective of the study was to describe the radial variability of xylem sap flux in rubber trunks. The experiment was conducted in mature rubber trees aged 13 yr from clone RRIM 600, in a non-traditional planting area at the Chachoengsao Rubber Research Center from January to December 2007. The sap flow was measured by the heat dissipation method using home-made radial probes and then calibrated with the cut stems of rubber tree in the laboratory. The radial variability was modeled as a function of the depth into the xylem. Regression analysis was carried out using data on the sap flux density and depth into the xylem. The model used two basic assumptions: (1) young xylem (0–4 cm) has the maximum sap flux density and is stable and (2) sap flux density decreases linearly with the depth into the xylem (and thus older xylem) toward the center of the stem. The results showed that the model for radial distribution can be used to predict the sap flux density and to estimate the tree transpiration of different trunk diameters in rubber trees. The tree transpiration was highly variable with different girths of the rubber trees. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Distribution Patterns of Latex Sucrose Content and Concurrent Metabolic Activity at the Trunk Level with Different Tapping Systems and in Latex Production Bark of Hevea bras ผู้เขียน:พิศมัย จันทุมา, ดร.ศรปราชญ์ ธไนศวรรยางกูร, รองศาสตราจารย์ , ดร.พูนพิภพ เกษมทรัพย์, รองศาสตราจารย์, Eric Gohet, Phillipe Thaler สื่อสิ่งพิมพ์:pdf AbstractDistribution patterns of latex sucrose content and concurrent metabolic activity at the trunk level with different tapping systems, namely 1/2S d/2 (a half spiral cut alternate daily), 1/2S d/3 ET 2.5%.8/y (a half spiral cut one day in tapping followed by two days of rest, stimulated with ethephon, eight applications per year) and DCA (Double Cut Alternate, 2?1/2S d/4 (t,t), two half spiral cuts, each cut tapped alternate on every four days) were studied. RRIM600 rubber trees were used to map the latex metabolic status from different heights on both panel A and panel B. Latex was collected by puncturing trunks at various positions and was analyzed using Latex Diagnosis technique (LD). The concurrent comparison of latex sucrose and inorganic phosphorus concentrations for every sampling position allowed estimating the size and shape of the actual latex regeneration area. Regular tapping induced latex sucrose depletion in tapped panel bark. This sucrose depletion was enhanced by the use of DCA, as a consequence of increased production and therefore higher latex regeneration metabolism. DCA also induced a huge sucrose sink effect above tapped cut on both panel A and panel B and outside the metabolically active area. |
 ผลงานตีพิมพ์ในวารสารวิชาการCan fertilization be a driver of rubber plantation intensification?ผู้แต่ง:Ms.RAWIWAN CHOTIPHAN , Laurent Vaysse, Regis Lacote, Eric Gohet, Philippe Thaler, Dr.Kannika Sajjaphan, Associate Professor , Celine Bottier, Christine Char, Dr.Siriluck Liengprayoon, Frederic Gay, วารสาร:  
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 Researcherดร. ศิริลักษณ์ เลี้ยงประยูรที่ทำงาน:ฝ่ายเทคโนโลยีชีวมวลและพลังงานชีวภาพ สถาบันค้นคว้าและพัฒนาผลิตผลทางการเกษตรและอุตสาหกรรมเกษตร สาขาที่สนใจ:การวิเคราะห์องค์ประกอบไขมันLipid Analysis, เทคโนโลยีและคุณภาพยางธรรมชาติ Nutural Rubber Technology Resume |
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ผลงานตีพิมพ์ในวารสารวิชาการBiofunctoolยฎ: a new framework to assess the impact of land management on soil quality. Part A: concept and validation of the set of indicatorsผู้แต่ง:Thoumazeau, A., Bessou, C., Renevier, M.-S., Trap, J., Marichal, R., Mareschal, L., Decaรซns, T., Bottinelli, N., Jaillard, B., Chevallier, T., Suvannang, N., Dr.Kannika Sajjaphan, Associate Professor, Thaler, P., Gay, F., Brauman, A., วารสาร: |
ผลงานตีพิมพ์ในวารสารวิชาการSoil CO2 efflux and soil carbon balance of a tropical rubber plantationผู้แต่ง:Dr.Duangrat Satakhun, Gay, F., Chairungsee, N., Dr.Poonpipope Kasemsap, Associate Professor, Chantuma, P., Dr.Sornprach Thanisawanyangkura, Associate Professor, Thaler, P., Epron, D., วารสาร: |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Photosynthetic Capacity and Effect of Drought on Leaf Gas
Exchange in Two Rubber (Hevea brasiliensis) Clones) ผู้เขียน:Krissada Sangsing, Xavier Le Roux, ดร.พูนพิภพ เกษมทรัพย์, รองศาสตราจารย์, ดร.ศรปราชญ์ ธไนศวรรยางกูร, รองศาสตราจารย์, ดร.กุมุท สังขศิลา, รองศาสตราจารย์, Eric Gohet, Phillipe Thaler สื่อสิ่งพิมพ์:pdf AbstractPhotosynthetic capacity, water-use efficiency and nitrogen-use efficiency were compared between
two different rubber clones, PB 260 and PB 217. Plants were grown in 50 dm3 pots in a greenhouse at
Clermont-Ferrand, France under controlled condition. Net CO2 assimilation rate at 1800 ppm CO2
(A1800) and at 360 ppm CO2 (A360), maximum carboxylation rate (Vcmax), electron transport capacity
(Jmax) and nitrogen-use efficiency (A1800/Na, A360/Na, Vcmax/Na and Jmax/Na) of clone PB 260 were
significantly higher than those of clone PB 217. However, the dark respiration rate (Rd), the ratio of lightsaturated
rate of electron transport and maximum rate of carboxylation (Jmax/Vcmax), leaf mass per area
(Ma), leaf nitrogen content (Nm), leaf nitrogen per area (Na), water use efficiency (WUE), SPAD value
(SPAD) and chlorophyll fluorescence ratio (Fv/Fm) were non- significantly different between these
clones. Effects of drought on leaf gas exchange rates was also studied. Net CO2 assimilation rate (A),
stomatal conductance (gs) and transpiration rate (E) showed a declining curve as a function of increased
water stress. WUE was high under severe stress, due to a more rapid decrease of E than A. At 14 days after
stress, gs and E decreased by 80-85%, while A decreased by 60-70%. Drought also reduced leaf water
potential, which was possitively related to stomatal conductance. These results confirmed the potential
genotypic variability of some photosynthetic traits under non-water-limited condition and stomatal
behavior related with hydraulic properties during water stress in rubber trees. |
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