Keywords :
Soil Water; Temperature; Tropical; Soil Respiration
บทคัดย่อ :
Soil respirations of different tropical ecosystems which consisted of agricultural fields, plantation areas and natural forests were investigated both in field and laboratory environments. For the field study, a line transect was laid in each ecosystems at Suranaree University of Technology (SUT), Sakaerat Environmental Research Station (SERS) and Sakaerat Silvicultural Research Station (SSRS), Nakhon Ratchasima. Then plastic chambers with airtight lids were fixed along the line at 20 m interval. The 24 h Soil respiration was measured by Soda-lime method. In SUT sites, mean soil respiration rate was highest in cornfield, followed by sunflower but lowest in eucalyptus plantation sites (Eu1) with the value of 4.2, 3.7 and 1.9 (mu)mol CO2 m-2d-1. The significant higher water content and neutral soil pH of cornfield and sunflower soils might be the cause of higher soil respiration rates than other ecosystems in SUT. In SERS and SSRS sites, the soil respiration was highest in dry evergreen forest (DEF) followed by Acacia auriculiformis and lowest in dry dipterocarp forest with the value of 4.3, 3.5 and 2.8 (mu)mol CO2 m-2d-1, respectively. The significant higher (p<0.01) soil organic carbon, total nitrogen and water content of DEF soil might contribute to its higher respiration rates. However, soil respiration of DEF and cornfield were not significantly different.
เอกสารอ้างอิง :
Dorji, K. (2010). The effect of soil water content and temperature on tropical soil respiration (Doctoral dissertation, School of Biology. Institute of Science. Suranaree University of Technology.).
