Keywords :
Soil Chemical Property; Dry Evergreen Forest;
Dry Deciduous Forest; Soil Texture; Forest Fire
บทคัดย่อ :
In northeast Thailand, dry evergreen forest (DEF) and dry deciduous forests (DEF) are distributed in a mosaic under similar climatic conditions. This study analyzed the soil chemical properties of DEF and DDF and then discussed the two-way interaction between soil properties and the distribution of DEF and DEF. Multipoint soil sampling was conducted in DEF and DDF, with three 20 m x 40 m plots in DEF and two similar plots in DDF. Soil samples were collected from every horizon of the representative soil profiles and at depths of 0-5, 5-15 and 40-50 cm at every 10 m grid point in the plots. Marked differences in chemical properties were found between DEF and DDF. T-C, T-N, Available P, and ECEC were higher in DEF than in DDF, whereas pH (H2O) and B.S. were higher in DDF than in DEF. These differences may be primarily derived from soil texture. The higher clay content in soil in DEF compared to DDF could hold more organic matter and had a higher cation exchange capacity. Meanwhile, fire events in DDF also played an important role in nutrient behaviour in the plant-soil system, with nutrients in the plant biomass translocated into the soil through the combustion of the forest biomass and litter, which would have resulted in increases in the soil pH (H2O) and B.S. in DDF soil.
เอกสารอ้างอิง :
Tominaga, K., Ohta, S., Ishida, A., Kanzaki, M., Wachrinrat, C., Archawakom, T., & Sase, H. (2008). Comparison of soil nutrient status between dry evergreen and deciduous forests in Northeast Thailand. Proceedings of the FORTROP II: Tropical Forestry Change in a Changing World. Kasetsart University, Bangkok, Thailand, 171-200.
