Hydrological dynamics of tropical streams on a gradient of land-use disturbance and recovery: A multi-catchment experiment

Nainar, Anand; Tanaka, Nobuaki; Bidin, Kawi; Annammala, Kogila Vani; Ewers, Robert M.; Reynolds, Glen; Walsh, R. P. D.

doi:10.1016/j.jhydrol.2018.09.022

Cited by 19 publications

(19 citation statements)

References 74 publications

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“…Considering that soils are constantly wetter in TMCF and that the area is prone to saturation-excess overland flow, a more rapid runoff mechanism may be predominant in TLRF. A likely mechanism may be infiltrationexcess overland flow found in similar secondary forests in the region [16,18,19]. Long dry periods and seasonal hydrophobicity that may also cause rapid runoff were however, never observed in TLRF.…”

Section: Resultsmentioning

confidence: 99%

“…Data collection lasted between January 2015 and December 2020. From this raw dataset, storm event hydrographs were extracted via the software GFORTRAN 4.9.3 based on the following criteria: three consecutive increases in water level marks the start of a storm event; an event ends when water level drops to within 20% of its initial value [16]. Period of equipment malfunction were excluded from analysis.…”

Section: Methodsmentioning

confidence: 99%

“…Differences in Tres and Tpeak between TMCF and TLRF were assessed via the Mann-Whitney test. The Analysis of Covariance (ANCOVA) was also used to control for the effects of rainfall (P) and rain intensity (Pi) [16,17].…”

Section: Methodsmentioning

confidence: 99%

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Differences in stream responsiveness between a tropical montane cloud forest and a tropical lowland rainforest

Nainar

Kuraji

Cleophas

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Tropical Montane Cloud Forests (TMCF) have unique hydrology considering their high moisture, steep headwater terrain, shallow soils, frequent precipitation, and the presence of horizontal precipitation. While the hydrology of Tropical Lowland Rainforests (TLRF) has been given due attention, TMCF in Malaysia have been less explored. This study compares stream responsiveness and peak flow dynamics between TLRF (substation Inobong, 5.33 ha) and TMCF (substation Alab, 8.53 ha) in Crocker Range, Sabah, Malaysia. Streams in both study site were instrumented with water level sensors and dataloggers, and meteorological stations that records data at 10-minute intervals. Two hydrograph metrices namely T res (time taken from start of precipitation to hydrograph initiation) and T peak (time taken from start of hydrograph response to peak discharge) were assessed via a combination of the Mann-Whitney test and ANCOVA. TMCF took a longer time to achieve peak water level (mean T peak=143 mins) compared to TLRF (mean T peak=118 mins). Average rainfall intensity (P i) was negatively correlated with T peak. T res was higher in TMCF (mean=141 mins) than in TLRF (mean=51 mins) and was not affected by P or P i. Understanding such hydrological dynamics in TMCF is important for better headwater resource management and for flood prevention.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Differences in stream responsiveness between a tropical montane cloud forest and a tropical lowland rainforest

Nainar

Kuraji

Cleophas

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…Evapotranspiration processes, but not the amount of precipitation, are impacted by land conversion from forests into OP plantations (Amin et al 2016). Oil palms planted on steep terrain cause negative hydrological impacts such as increased flooding risk, modification of river ecology, and sedimentation (Nainar et al 2018;Saadatkhah et al 2016). Soil mineralization rates are similar between OP plantations and forests in Sabah (Hamilton et al 2016) with approximately 90% reduction of denitrification and anaerobic ammonium oxidation disrupting nitrogen gas (N 2 ) production.…”

Section: Emissions Soil and Climate (Sdg6 13)mentioning

confidence: 99%

Impact of Malaysian palm oil on sustainable development goals: co-benefits and trade-offs across mitigation strategies

et al. 2021

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Palm oil (PO) is an important source of livelihood, but unsustainable practices and widespread consumption may threaten human and planetary health. We reviewed 234 articles and summarized evidence on the impact of PO on health, social and economic aspects, environment, and biodiversity in the Malaysian context, and discuss mitigation strategies based on the sustainable development goals (SDGs). The evidence on health impact of PO is equivocal, with knowledge gaps on whether moderate consumption elevates risk for chronic diseases, but the benefits of phytonutrients (SDG2) and sensory characteristics of PO seem offset by its high proportion of saturated fat (SDG3). While PO contributes to economic growth (SDG9, 12), poverty alleviation (SDG1, 8, 10), enhanced food security (SDG2), alternative energy (SDG9), and long-term employment opportunities (SDG1), human rights issues and inequities attributed to PO production persist (SDG8). Environmental impacts arise through large-scale expansion of monoculture plantations associated with increased greenhouse gas emissions (SDG13), especially from converted carbon-rich peat lands, which can cause forest fires and annual trans-boundary haze; changes in microclimate properties and soil nutrient content (SDG6, 13); increased sedimentation and change of hydrological properties of streams near slopes (SDG6); and increased human wildlife conflicts, increase of invasive species occurrence, and reduced biodiversity (SDG14, 15). Practices such as biological pest control, circular waste management, multi-cropping and certification may mitigate negative impacts on environmental SDGs, without hampering progress of socioeconomic SDGs. While strategies focusing on improving practices within and surrounding plantations offer co-benefits for socioeconomic, environment and biodiversity-related SDGs, several challenges in achieving scalable solutions must be addressed to ensure holistic sustainability of PO in Malaysia for various stakeholders.

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“…9), continuing hydrological work at Universiti Malaysia Sabah (e.g. Bidin and Chappell 2006;Nainar et al 2018), managing Yayasan Sabah's conservation division, establishing new field stations, supporting the Sabah Parks and Wildlife Service, all being practitioners supporting social and environmental work. I encouraged them to present papers at international conferences (Sinun et al 1992;Bidin et al 1993).…”

Section: My Malaysian Legacymentioning

confidence: 99%

Scholar in the SEPR spotlight: Ian Douglas

Douglas

2020

Socio Ecol Pract Res

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In this reflective essay of intellectual autobiography, I respond to a series of questions the journal editor Wei-Ning Xiang asked about my 55-year journey from applied geography to socio-ecological practice research. These are (1) what and/or who had inspired your career most in geography and socio-ecological practice research? (2) Throughout your 55-year academic journey, did you ever reorient your ambitions in scholarly pursuit, or even reinvent yourself in your academic life? What motivated you in each of these instances? (3) How do you measure success in your work? Among many accomplishments, what are the top three that you are most proud of? (4) From your personal experience, what would be the most important attributes for a well-lived, fully realised, and meaningful life? Do you have any tips for maintaining work-life balance? (5) Do you have any specific advice for younger scholars in geography and socio-ecological practice research? (6) What are the three most interesting images reflecting turning points in your career? I hope that my experiences and insights showcased in this essay are helpful to the younger generations of geographers and socio-ecological practice researchers.

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Hydrological dynamics of tropical streams on a gradient of land-use disturbance and recovery: A multi-catchment experiment

Cited by 19 publications

References 74 publications

Differences in stream responsiveness between a tropical montane cloud forest and a tropical lowland rainforest

Differences in stream responsiveness between a tropical montane cloud forest and a tropical lowland rainforest

Impact of Malaysian palm oil on sustainable development goals: co-benefits and trade-offs across mitigation strategies

Scholar in the SEPR spotlight: Ian Douglas

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