Long-term variation in soil moisture in Pasoh Forest Reserve a lowland tropical rainforest in Malaysia

Takanashi S., . and Kosugi Y., . and Niiyama K., . and S. Siti Aisah, . and Noguchi S., . and Lion M., . and Tani M., . Long-term variation in soil moisture in Pasoh Forest Reserve a lowland tropical rainforest in Malaysia. pp. 324-333. ISSN 0128-1283

Clarifying variations in soil moisture is an important part of hydrological and ecological studies in tropical rainforests. Volumetric soil water content (VSWC) was measured at depths of 10 20 and 30 cm at Pasoh Forest Reserve (PFR) in Peninsular Malaysia for 12 years. VSWC ranged from 0.280“0.442 m3 m-3 (mean standard error; 0.373 0.001 m3 m-3) and was affected not only by the south-west and north-east monsoons but also by El Nio and La Nia events. Mean VSWC was high during La Nia events and low during El Nio events. In a normal El Nio/Southern Oscillation (ENSO) phase VSWC showed both low and high conditions. An antecedent precipitation index (API) was calculated using 20 years of rainfall data. API90 ranged from 1.2“257.3 mm (25.4 0.2 mm). The variations in API90 followed a similar pattern to variations in the VSWC. API90 can be used to estimate soil moisture conditions as a drought indicator. An API90 of less than 10 mm lasted more than 14 successive days during the normal ENSO phases when five mass flowerings occurred at PFR from 1995“2014.

Full text available from: Official URL: https://www.frim.gov.my/v1/jtfsonline/jtfs/v28n5/3...

Abstract

Clarifying variations in soil moisture is an important part of hydrological and ecological studies in tropical rainforests. Volumetric soil water content (VSWC) was measured at depths of 10 20 and 30 cm at Pasoh Forest Reserve (PFR) in Peninsular Malaysia for 12 years. VSWC ranged from 0.280“0.442 m3 m-3 (mean standard error; 0.373 0.001 m3 m-3) and was affected not only by the south-west and north-east monsoons but also by El Nio and La Nia events. Mean VSWC was high during La Nia events and low during El Nio events. In a normal El Nio/Southern Oscillation (ENSO) phase VSWC showed both low and high conditions. An antecedent precipitation index (API) was calculated using 20 years of rainfall data. API90 ranged from 1.2“257.3 mm (25.4 0.2 mm). The variations in API90 followed a similar pattern to variations in the VSWC. API90 can be used to estimate soil moisture conditions as a drought indicator. An API90 of less than 10 mm lasted more than 14 successive days during the normal ENSO phases when five mass flowerings occurred at PFR from 1995“2014.

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Item Type:	Article
AGROVOC Term:	Soil moisture
AGROVOC Term:	Tropical rain forests
AGROVOC Term:	Soil water content
AGROVOC Term:	Forest reserves
AGROVOC Term:	Monsoon climate
AGROVOC Term:	Rainfall
AGROVOC Term:	Precipitation
AGROVOC Term:	Drought
AGROVOC Term:	Flowering
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 00:40
URI:	http://webagris.upm.edu.my/id/eprint/22905

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