Effects of different land-use on suspended sediment dynamics in Sabah (Malaysian Borneo) – a view at the event and annual timescales

Nainar, Anand; Bidin, Kawi; Walsh, R. P. D.; Ewers, Robert M.; Reynolds, Glen

doi:10.3178/hrl.11.79

Cited by 19 publications

(10 citation statements)

References 15 publications

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“…In fact, these forests contribute to maintaining the quality of surface water in particular. As such, in their study, Nainar et al (2017) underlined some contributions of rainforest to the preservation of water quality and reduced erosion. However, the results of many articles analyzed in this study indicated that forest areas are gradually decreasing in Malaysia, mainly due to the conversion actions to either agricultural or urban development activities.…”

Section: Impact Of Forest Land Use On Water Qualitymentioning

confidence: 93%

Impact of land uses on water quality in Malaysia: a review

2019

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Land use changes in urbanization, industrialization, and agricultural processes will continue to have negative impacts on water quality at all scales. The impact of land use changes on water quality is generally studied by analyzing the relationships between land use and water quality indicators. Therefore, the purpose of this research was to review and analyze the main relationships between land use and water quality, as well as to visualize the major sources and processes of water quality pollution in Malaysia. To achieve our goal, we evaluated the significance of both land use and water quality attributes used in the past studies and correlated them to understand their relationship from another angle of view. The results revealed that 87% of the reviewed studies indicated urban land use as a major source of water pollution, while 82% indicated agricultural land use, 77% indicated forest land use, and 44% indicated other land uses. However, the results of correlation analysis showed that agricultural and forest-related activities more affected water quality through their significant positive correlation with physical and chemical indicators of water quality, while urban development activities had a greater impact on water quality through altering hydrological processes such as runoff and erosion. These findings would provide decision-makers with useful information for managing water pollution processes rather than sources only.

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Section: Impact Of Forest Land Use On Water Qualitymentioning

confidence: 93%

Impact of land uses on water quality in Malaysia: a review

2019

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“…Sediment yield increases in the early stages of oil palm establishment when compared to forest cover and agroforest (Carlson et al 2014, Nainar et al 2017. An increase has been also observed in soil erosion in oil palm compared to forest (Gharibreza et al 2013, Nainar et al 2017 (figure 5). Erosion and sediment concentration in streams increase due to oil palm establishment, after forest conversion.…”

Section: Fluvial Processesmentioning

confidence: 93%

“…For example, compared to rainforest, sediment yield increased with differences between 19 000 ± 3400 mg h −1 ha −1 in juvenile plantations and 8000 ± 2000 mg h −1 ha −1 in mature plantations (Carlson et al 2014). In another study, annual suspended sediment concentration discharge in an oil palm catchment was estimated to be 4-12 times greater than primary and multiple-logged forest catchments (Nainar et al 2017). Similarly, in a 5 years old oil palm plantation, erosion was higher (46 kg ha −1 ) than in forests (13 kg ha −1 ) (Jaya et al 2018).…”

Section: Fluvial Processesmentioning

confidence: 95%

Ecohydrological impacts of oil palm expansion: a systematic review

Gómez

Parra

Pavelsky

et al. 2023

Environ. Res. Lett.

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Global demand for vegetable oil and high oil palm yield have driven the rapid expansion of oil palm plantations in tropical countries. The research literature widely recognizes the effects of forest cover conversion into oil palm on biodiversity, deforestation, and carbon dynamics. However, research on the ecohydrological impacts of oil palm plantations is sparse, despite studies indicating that oil palm development may reshape land-water interactions and the availability and movement of water at different spatial and temporal scales. We address this gap by conducting a systematic literature review on oil palm development and its relation to ecohydrological processes. We found 139 relevant papers up to the year 2021, addressing different ecohydrological processes related to oil palm. We reviewed their spatiotemporal scales, geographic distribution, oil palm species and age, and the effects of land conversion from forest, cropland, and pastures. We also incorporated societal aspects regarding community perceptions of water. Our review highlights the effects of oil palm plantations on three main components of the water cycle: i) land-atmosphere, ii) fluvial systems, and iii) soils and groundwater. Most studies include analyses of the Indo-Malayan and Australasian biogeographical regions (113), followed by the Neotropics (49) and the Afrotropics (15). Compared to rainforests, oil palm monocultures are warmer and drier. They have higher evapotranspiration rates, lower runoff regulation and infiltration capacity, and lower soil organic carbon. Although less often implemented, alternative oil palm management practices, including oil palm agroforestry, can help to mitigate some of these effects. Forest to oil palm conversion is the most studied land transition, while conversions from croplands, pastures, and grasslands are less studied. Overall, we identify gaps in understanding the long-term effects of management on ecohydrological processes under different land conversions, especially in the Neotropics and the Afrotropics, precluding research-informed policy to manage impacts of this expanding crop.

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“…This sudden in ux of material may cause ooding and alter the river's morphology by accelerating erosion and altering the geometry of the channel. Complicating matters, these are all additional factors to the naturally occurring drivers of mass movement, namely climate, weathering, stream ow, and other characteristics such as soil type, vegetation, and land-cover that in uence geomorphological changes in an area (Nainar et al 2017; Sidle et al 2006). Nevertheless, Xue et al (2013) discovered that signi cant mass movements were governed by episodic seismic events rather than these recurrent factors.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Immediate and Five-Year Earthquake Impacts on River Systems in Sabah, Malaysia Using Multi-Temporal Satellite Imageries

Chai

Nainar

Roslee

et al. 2023

Preprint

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Earthquake is one of the most destructive natural disasters, which cause immediate and long-term changes to the river systems. This research aimed to examine the immediate and five-year impacts of the 2015 Ranau Earthquake (6.0 Mw) on river systems in Malaysian state of Sabah, a region of low earthquake hazard. We used object-based classification on Landsat 8 (2014 and 2015) and Sentinel-2A (2020) satellite imageries to derive land cover time series for investigating the impacts on the riparian areas. The earthquake removed vegetation in the riparian zones of four rivers, the highest being the Penataran River (69.21 ha). During the immediate impact period (2014-2015), river bar formation occurred in all rivers, with the largest increase occurring in the Kadamaian River (56.97 ha), followed by the Panataran River (54.36 ha), which had no river bar before the earthquake. The river bar of the Kadamaian River continued to increase, whereas the river bar of the Panataran River decreased five years after the earthquake. Land cover transition analysis revealed that 78.39 ha of vegetation, barren land, and river water areas changed to river bars in the Kadamaian riparian area during the immediate impact period. Except for 26.87 percent of river bars in the Kadamaian riparian area in 2015, most river bars transitioned to other land cover types five years later. During the period of immediate impact, 22.05 ha of vegetation and 10.71 ha of river water were transformed into river bars along the Penataran River. Five years later, except for 16.2 ha, all river bar areas had transitioned to other cover types. Additionally, 17.7 ha of new river bars were formed. This study provides crucial data on post-earthquake land cover changes, particularly river bar formation and changes, for assessing the earthquake impacts on the river systems and supporting impact mitigation.

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Effects of different land-use on suspended sediment dynamics in Sabah (Malaysian Borneo) – a view at the event and annual timescales

Cited by 19 publications

References 15 publications

Impact of land uses on water quality in Malaysia: a review

Impact of land uses on water quality in Malaysia: a review

Ecohydrological impacts of oil palm expansion: a systematic review

Assessment of Immediate and Five-Year Earthquake Impacts on River Systems in Sabah, Malaysia Using Multi-Temporal Satellite Imageries

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