Temporal Variation in the Stable Isotopes In

Lion, Marryanna; Kosugi, Yukio; Itoh, Masatoshi; Noguchi, Shoji; Takanashi, Satoru; Katsuyama, Masanori; Tani, Makoto; Siti-Aisah, S.

doi:10.26525/jtfs2017.29.3.349362

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…The annual average rainfall from January 2016 to December 2017 at the meteorological station is 2212 mm. The monthly rainfall ranges from 87 mm to 362 mm, with peaks in May and November due to the monsoons, similar to the watersheds west of Peninsular Malaysia (Marryanna et al, 2017;Bahar et al, 2021). The minimum and maximum temperatures are 20.1 and 37.9°C, respectively, from January 2016 to December 2017, and the average relative humidity is 92% from January to December 2017.…”

Section: Study Areamentioning

confidence: 92%

Rainfall-runoff characteristics in a tropical forested catchment, Puchong, Selangor, Malaysia

Saito

Tsujimura

Bakar

2023

Hydrological Research Letters

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This study aims to clarify the contributions of pre-event water to storm runoff using environmental tracers (dissolved inorganic ions and stable isotopes) in a tropical forested catchment in Puchong, Selangor, Malaysia. We performed intensive sampling campaigns of stream water and throughfall for two storm events in July and November 2018. The discharge showed a low peak of 0.13 mm/h in event 1, with 18 mm of total rainfall, whereas event 2, with 50 mm of total rainfall, showed a quick discharge peak of 1.17 mm/h and a slow recovery of 0.39 mm/h. The nitrate concentration in the stream water during event 2 was higher than that in event 1. The temporal variations in nitrate ions indicate that subsurface water provided a dominant stormflow in event 2. Hydrograph separations using silicate as a tracer revealed that pre-event water was the dominant component of the storm hydrograph (58-98%). Our results suggest that pre-event water plays an essential role in storm runoff of headwaters in humid tropical regions.

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Section: Study Areamentioning

confidence: 92%

Rainfall-runoff characteristics in a tropical forested catchment, Puchong, Selangor, Malaysia

Saito

Tsujimura

Bakar

2023

Hydrological Research Letters

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“…Consequently, it will result in a valuable database for hydrological studies in Malaysia and also Southeast Asia. Marryanna et al (2017) highlighted the importance of stable isotope signals in precipitation water in their effort to conserve the tropical rainforests in Peninsular Malaysia. Stable isotope signals in precipitation water serve as indices of site-dependent rainfall and climate characteristics.…”

Section: Introductionmentioning

confidence: 99%

Stable isotope characteristics of precipitation in Malaysia: establishment of local meteoric water line

Mostapa,

Samuding,

Shah

et al. 2024

Theor Appl Climatol

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Evapotranspiration and water source of a tropical rainforest in peninsular Malaysia

Lion

Kosugi

Takanashi

et al. 2017

Hydrological Processes

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To evaluate water use and the supporting water source of a tropical rainforest, a 4‐year assessment of evapotranspiration (ET) was conducted in Pasoh Forest Reserve, a lowland dipterocarp forest in Peninsular Malaysia. The eddy covariance method and isotope signals of rain, plant, soil, and stream waters were used to determine forest water sources under different moisture conditions. Four sampling events were conducted to collect soil and plant twig samples in wet, moderate, dry, and very dry conditions for the identification of isotopic signals. Annual ET from 2012 to 2015 was quite stable with an average of 1,182 ± 26 mm, and a substantial daily ET was observed even during drought periods, although some decline was observed, corresponding with volumetric soil water content. During the wet period, water for ET was supplied from the surface soil layer between 0 and 0.5 m, whereas in the dry period, approximately 50% to 90% was supplied from the deeper soil layer below 0.5‐m depth, originating from water precipitated several months previously at this forest. Isotope signatures demonstrated that the water sources of the plants, soil, and stream were all different. Water in plants was often different from soil water, probably because plant water came from a different source than water that was strongly bound to the soil particles. Plants showed no preference for soil depth with their size, whereas the existence of storage water in the xylem was suggested. The evapotranspiration at this forest is balanced and maintained using most of the available water sources except for a proportion of rapid response run‐off.

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Temporal Variation in the Stable Isotopes In

Cited by 6 publications

References 16 publications

Rainfall-runoff characteristics in a tropical forested catchment, Puchong, Selangor, Malaysia

Rainfall-runoff characteristics in a tropical forested catchment, Puchong, Selangor, Malaysia

Stable isotope characteristics of precipitation in Malaysia: establishment of local meteoric water line

Evapotranspiration and water source of a tropical rainforest in peninsular Malaysia

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