 |
|
|
|
 ผลงานตีพิมพ์ในวารสารวิชาการSoil Respiration in Different Ages of Teak Plantations in Thailandผู้แต่ง: Masamichi TAKAHASHI, Keizo HIRAI, Pitayakon LIMTONG, Chaveevan LEAUNGVUTIVIROG,  Dr.Orasa Suksawang, Associate Professor , Samreong Panuthai, Dr.Somchai Anusontpornperm, Associate Professor , Dr.Dokrak Marod, Professor , วารสาร:  
|
|
ผลงานตีพิมพ์ในวารสารวิชาการSoil respiration in response to year-to-year variations in rainfall in a tropical seasonal forest in northern Thailandผู้แต่ง:Kume, T., Tanaka, N., Yoshifuji, N., Mr.Chatchai Tantasirin, Assistant Professor , Igarashi, Y., Suzuki, M., Hashimoto, S., วารสาร: |
|
ผลงานตีพิมพ์ในวารสารวิชาการTopographic variation in heterotrophic and autotrophic soil respiration in a tropical seasonal forest in Thailandผู้แต่ง:Masamichi TAKAHASHI, Keizo HIRAI, Pitayakon LIMTONG, Chaveevan LEAUNGVUTIVIROG, Samreong Panuthai, Songtam Suksawang, Dr.Somchai Anusontpornperm, Associate Professor, Dr.Dokrak Marod, Professor, วารสาร: |
ผลงานตีพิมพ์ในวารสารวิชาการSeasonal changes in soil respiration and microbial biomass in five tropical tree plantations in Thailandผู้แต่ง:Mori, T, Wachrinrat, C, Staporn, D, Mr.Ponthep Meunpong, Associate Professor , Suebsai, W, Mr.Khitja Boonsri , Kitayama, K, วารสาร: |
|
 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Temperature and Moisture Controls of Soil Respiration in a Dry Dipterocarp Forest, Ratchaburi Province) ผู้เขียน:Phongthep Hanpattanakit, สำเริง ปานอุทัย, Amnat Chidthaisong สื่อสิ่งพิมพ์:pdf AbstractTo quantify soil respiration and to investigate its diurnal and seasonal variations, soil respiration was studied in a dry dipterocarp forest located in Chombung District, Ratchaburi Province (13? 35’ 13.3” N, 99? 30’ 3.9” E). Soil respiration was measured hourly during February to July 2008 using a closed-automatic chamber method. The results showed that soil respiration varied significantly both spatially and seasonally. Among three replicates of measurements and within each hour of measurement, the coefficient of variations could be as high as 80%. On a daily scale, a weak relationship between soil respiration and soil temperature was observed. On a seasonal scale, a negative relationship between soil respiration and temperature was observed. However, a strong positive relationship between soil respiration and soil moisture over the moisture range of 17-19%vol was found. Soil respiration decreased beyond this moisture level. The total CO2 emissions during the six-month period in dry dipterocarp forest were 1.81 kgCO2/m2, or 4.9 tonne C/ha. |
 |
|
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Moisture and Temperature on Respiration in Tropical Forest and Agricultural Soils) ผู้เขียน:Siriporn Wiriyatangsakul, Amnat Chidthaisong, Sudarut Tripetchkul, Pitayakorn Limtong สื่อสิ่งพิมพ์:pdf AbstractSoil respiration in tropical uplands was studied in agriculture (maize) and dry evergreen forest soils. The objective of this study was to investigate the effects of moisture and temperature on soil respiration. Diurnal variations of in situ soil CO2 efflux was studied in May 2004 and February 2005. In the laboratory, soil respiration in a short-term incubation was measured under various moisture contents (air-dry, 25, 50, 75 and 100%WHC) and various constant temperatures (10?C to 45?C). In situ soil CO2 flux showed strong diurnal patterns correlated with both air and soil temperature. CO2 efflux from both study sites increased to the maximum values during the late afternoon, usually 2-4 hours after a peak in air temperature. The total soil CO2 fluxes integrated over the measurement period were 1354 and 3082 mg CO2 m-2 day-1 at agricultural site and 1467 and 12851 mg CO2 m-2 day-1 at forest site in May 2004 and February 2005, respectively. The Q10 value for agricultural site estimated from relationship between soil temperature at 5 cm and CO2 flux was 3.37 (May 2004). For the forest site, the Q10 was 2.04 (February 2005). Results from laboratory study indicated that the topsoil layer (the top 20 cm) contributed mainly to the overall respiration. Soil respiration was highest at moisture between 50% and 75% WHC. The Q10 values of agricultural soil were higher than of that of the forest soil, indicating relatively higher sensitivity of the agricultural soil to temperature change than the forest soil. Laboratory results also indicated that subsoil was more sensitive to temperature and moisture changes than topsoil. |
ผลงานตีพิมพ์ในวารสารวิชาการContrastive effects of inorganic phosphorus addition on soil microbial respiration and microbial biomass in tropical monoculture tree plantation soils in Thailandผู้แต่ง:Mori, T., Wachrinrat, C., Staporn, D., Mr.Ponthep Meunpong, Associate Professor, Suebsai, W., Matsubara, K., Mr.Khitja Boonsri, Lumban, W., Kuawong, M., Phukdee, T., Srifai, J., Boonman, K., วารสาร: |
ผลงานตีพิมพ์ในวารสารวิชาการEffects of phosphorus addition on nitrogen cycle and fluxes of N2O and CH4 in tropical tree plantation soils in Thailandผู้แต่ง:Mori, T., Wachrinrat, C., Staporn, D., Mr.Ponthep Meunpong, Associate Professor, Suebsai, W., Matsubara, K., Mr.Khitja Boonsri, Lumban, W., Kuawong, M., Phukdee, T., Srifai, J., Boonman, K., วารสาร: |
ผลงานตีพิมพ์ในวารสารวิชาการEarly effects of conservation agriculture on soil organic carbon dynamics of Mollisols in Cambodiaผู้แต่ง:Koun, P., Vernet, P.-A., Filloux, T., Sar, V., Seng, V., Dr.Porntip Srimongkol, Assistant Professor , Mr.Phakphoom TANTACHASATID, Lecturer , Sen, R., Pheap, S., Tivet, F., Thoumazeau, A., วารสาร: |
|
 |