半島マレイシア・熱帯雨林における土壌水貯留量の季節変動

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  • Seasonal Soil Water Storage Changes In a tropical Rain Forest in Peninsular Malaysia.
  • ハントウ マレイシア ネッタイ ウリン ニ オケル ドジョウスイ チョリュウリョウ ノ キセツ ヘンドウ

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Soil matric potential was observed using tensiometers in a tropical rain forest in Peninsular Malaysia. Undisturbed soil samples were also collected, and the relationships between volumetric water content (θ) and suction (ψ) of the soils were measured. The relationships between θ-ψ of soils with fitted curves generated by the van Genuchten model were excellent. The macro-and meso-porosity of the soil decreased with increases in soil depth. The capacity of water storage calculated by the difference of the saturated soil water content and residual water content in a 160-cm soil profile was 420mm. Although this humid tropics region has no distinct wet or dry seasons, the soil water storage showed both wet and dry conditions and the variation of the soil water storage corresponded to the fluctuation of rainfall. Soil water storage for the 160-cm profile ranged from 488 to 694mm of water with a mean of 565mm over a two-year. It should be considered the change of water storage when evapotranspiration of this basin is calculated using water balance method over only a period of one year. The variation of soil water storage to the rainfall in the upper soil (0∼80cm) was more remarkable and greater than the water storage in the lower soil (80∼160cm) throughout the year. The mean daily evapotranspiration rate calculated by the water balance of the 1.6-m of the soil profile ranged from 2.1 to 7.3mm day-1 with mean of 4.6mm day-1.

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