Chemical characteristics of water at the upper reaches of the Sebangau River, Central Kalimantan, Indonesia

Tachibana, Harukuni; Iqbal, Rofiq; Akimoto, Sachiko; Kobayashi, Mutsuko; Kanie, Syunji; Mori, Akio; Itakura, Tadaoki; Takahashi, Hidenori; Utosawa, Kohken; Sumawijaya, Nyoman; Dohong, Salampak; Darung, Untung; Limin, Suwido H.

doi:10.3759/tropics.15.411

Cited by 4 publications

(3 citation statements)

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“…Tropical peatland waters can have very high DOC concentrations (Miyamoto et al , 2009; Yule & Gomez, 2009) and, together with lower amounts of particulate organic carbon (POC) (cf. Yoshioka et al , 2002), this carbon is exported in substantial amounts (Tachibana et al , 2006; Alkhatib et al , 2007; Baum et al , 2007; Rixen et al , 2008; cf. Hope et al , 1994; Harrison et al , 2005) and rapidly decomposed (cf.…”

Section: Discussionmentioning

confidence: 99%

Greenhouse gas fluxes from tropical peatlands in south‐east Asia

Couwenberg

Dommain

Joosten

2010

Global Change Biology

403

410

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The lowland peatlands of south-east Asia represent an immense reservoir of fossil carbon and are reportedly responsible for 30% of the global carbon dioxide (CO 2 ) emissions from Land Use, Land Use Change and Forestry. This paper provides a review and meta-analysis of available literature on greenhouse gas fluxes from tropical peat soils in south-east Asia. As in other parts of the world, water level is the main control on greenhouse gas fluxes from south-east Asian peat soils. Based on subsidence data we calculate emissions of at least 900 g CO 2 m À2 a À1 ($ 250 g C m À2 a À1 ) for each 10 cm of additional drainage depth. This is a conservative estimate as the role of oxidation in subsidence and the increased bulk density of the uppermost drained peat layers are yet insufficiently quantified. The majority of published CO 2 flux measurements from southeast Asian peat soils concerns undifferentiated respiration at floor level, providing inadequate insight on the peat carbon balance. In contrast to previous assumptions, regular peat oxidation after drainage might contribute more to the regional long-term annual CO 2 emissions than peat fires. Methane fluxes are negligible at low water levels and amount to up to 3 mg CH 4 m À2 h À1 at high water levels, which is low compared with emissions from boreal and temperate peatlands. The latter emissions may be exceeded by fluxes from rice paddies on tropical peat soil, however. N 2 O fluxes are erratic with extremely high values upon application of fertilizer to wet peat soils. Current data on CO 2 and CH 4 fluxes indicate that peatland rewetting in south-east Asia will lead to substantial reductions of net greenhouse gas emissions. There is, however, an urgent need for further quantitative research on carbon exchange to support the development of consistent policies for climate change mitigation.

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Section: Discussionmentioning

confidence: 99%

Greenhouse gas fluxes from tropical peatlands in south‐east Asia

Couwenberg

Dommain

Joosten

2010

Global Change Biology

403

410

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“…Whole catchments of the Sebangau River are covered by peatlands, and hence river water contains a high concentration of humic substances (dark brown color) and background pH is 3.5-4.0. Tachibana et al (2003) reported that maximum water fl ux of Sebangau River is 50 m 3 /s from December to February and the minimum is 5 m 3 /s from June to September at Kya. Water fl ux of the lower basin of the Sebangau River is not reported.…”

Section: Study Sites and Methodsmentioning

confidence: 98%

Effect of sulfuric acid discharge on river water chemistry in peat swamp forests in central Kalimantan, Indonesia

Haraguchi

2007

Limnology

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Effect of sulfuric acid discharge on river water chemistry in peat swamp forests in central Kalimantan, Indonesia Abstract To estimate the range of area that is affected by sulfuric acid pollution after pyrite oxidation, the surface water chemistry of two rivers in peat swamp forests in central Kalimantan, Indonesia, was surveyed at 1.0-to 3.0-km intervals in September 2003 and 2004 (dry season) and March 2004 and 2005 (rainy season). Water discharged from canals into the main stream of the Sebangau River and the Kahayan River showed lower pH compared to the mainstream water of the rivers, implying sulfuric acid loading from the canal to the main stream of the rivers. The ratio of concentrations of sulfate ion/chloride ion, which was used as a parameter for estimating the contribution of pyritic sulfate to river water chemistry, showed that sulfuric acid loading from pyrite oxidation occurred from the river mouth up to 150 km upstream in both rivers. Water of the main stream of the rivers as well as water discharged from artifi cial canals into the main stream in the rainy season showed much higher acidity and a higher ratio of sulfate ion/chloride ion than that in the dry season. This result implies that the discharge of pyritic sulfate from peat swamp forests to the limnological system is much higher in the rainy (high water table) season than the dry (low water table) season. Water in the canal in the rainy season was found to be highly acidic (pH = 2.0-3.0). Pyrite oxidation after peatland development causes not only acidifi cation of soil but also acidifi cation of the limnological ecosystem.

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“…The periodic fluctuation of cation concentrations during this transition period is presumably due to the sudden increase of water discharge that might be bringing more organic inputs to the system. B I O DI VE RS I T A S 19 (4): 1181-1185, July 2018 1182 Despite the fact that this humic floodplain ecosystem of Palangka Raya is physicochemically poor in nutrient content (Tachibana et al 2003), it supports high diversity and production of inland fisheries. There were more than 300 freshwater fish species had been recorded in Central Kalimantan Province (Anon 2010).…”

Section: Introductionmentioning

confidence: 99%

Seasonal yield and composition of an inland artisanal fishery in a humic floodplain ecosystem of Central Kalimantan, Indonesia

Gumir¹,

Ardianor²,

Syahrinudin³

et al. 2018

Biodiversitas

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Gumiri S, Ardianor, Syahrinudin, Anshari GZ, Komai Y, Taki K, Tachibana H. 2018. Seasonal yield and composition of aninland artisanal fishery in a humic floodplain ecosystem of Central Kalimantan, Indonesia. Biodiversitas 19: 1181-1185. Seasonal yieldof an inland artisanal fishery was studied in 2015 in the Takapan Floodplain Lake located along the Rungan River of Central KalimantanProvince-Indonesia. Record on daily fish catch consisting weight data and species composition was made in situ along with a one-yearrainfall data that was collected from the nearest Meteorological Station located in Palangka Raya City airport. Results showed thatthroughout the year, total annual yield of captured fishes reached 4.8 tons comprised of 34 commercial freshwater fish species. Seasonalyield varied considerably in which fish capture was higher during the rainy season than on the dry season. The transition period fromrainy to dry season was found to be the peak period of fish capture in the floodplain. Of the 34 fish species, the most abundant specieswas Channa striata that accounted to almost 50% of total annual fish yield. The two most abundant fishes, Channa striata, andKryptopterus palembangensis were a top predatory blackfish and an omnivorous surface water whitefish, respectively. This resultindicated that the studied floodplain habitat was still in good condition, however, conservation is needed to maintain the sustainability offreshwater fish resource in the future.

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Chemical characteristics of water at the upper reaches of the Sebangau River, Central Kalimantan, Indonesia

Abstract: ABSTRACT

Cited by 4 publications

References 1 publication

Greenhouse gas fluxes from tropical peatlands in south‐east Asia

Greenhouse gas fluxes from tropical peatlands in south‐east Asia

Effect of sulfuric acid discharge on river water chemistry in peat swamp forests in central Kalimantan, Indonesia

Seasonal yield and composition of an inland artisanal fishery in a humic floodplain ecosystem of Central Kalimantan, Indonesia

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