Effect of land developmental process on soil solution chemistry in acid sulfate soils distributed in the Mekong Delta, Vietnam

Kawahigashi, Masayuki; Minh, Nhut; Nguyen, Ve Bao; Sumida, Hiroaki

doi:10.1111/j.1747-0765.2008.00256.x

Cited by 19 publications

(16 citation statements)

References 29 publications

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“…Acid sulfate soils in the Mekong Delta with different land development processes have been evaluated to estimate the acid and metal release potentials under drought conditions (Kawahigashi et al . 2008).…”

Section: Introductionmentioning

confidence: 99%

Effects of drying on the release of solutes from acid sulfate soils distributed in the Mekong Delta, Vietnam

Kawahigashi¹,

Minh²,

Nguyen³

et al. 2008

Soil Science and Plant Nutrition

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Acids and soluble metal loads resulting from strong acidification preceded by severe drying of acid sulfate soils are fatal soil conditions for agricultural productivity and aquaculture environments. A greater concentration of dissolved Al and Fe after seasonal drought was confirmed in our previous paper using acid sulfate soils in the Mekong Delta. Furthermore, moisture desiccation resulting from land-use change and subsoil excavation for drainage probably promotes soil oxidation followed by acidification. We prepared air-dried soil moisture condition actual acid sulfate soils in the Mekong Delta to evaluate acidification and the release of acids and metals with drying. The pH values of the deepest horizon in the Hydroaquentic Sulfaquepts drastically dropped and greater concentrations of Al and Fe were released with drying. It was a common change from the sulfidic horizon to the sulfuric horizon. A large increase in Al release without a drop in pH after drying was observed in the sulfuric horizons of the Typic Sulfaquept, which developed on the oldest land in the Mekong Delta. Acidification by oxidation of reduced sulfur compounds might be compensated mainly by exchangeable Al and/or by the dissolution of Fe and Al oxides. In contrast, the concentration of Al increased slightly by drying in the sulfuric horizons in the Hydroaquentic Sulfaquept, which developed in the newer delta. The exchangeable basic cations in these soil horizons might still be effective in compensating for the protons produced by the oxidation of pyrite. The difference in the Al released by drying between the two sulfuric horizons might be attributed to the ripeness of the acid sulfate soils. The ripeness of the soil on the older delta might be higher than that on the younger delta. In this study, drying of acid sulfate soils, even in the sulfuric horizon, can promote metal release due to the exchange by protons derived from the oxidation of reduced sulfur compounds. However, further acidification might be compensated by a substantial amount of exchangeable cation and oxide dissolution.

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Section: Introductionmentioning

confidence: 99%

Effects of drying on the release of solutes from acid sulfate soils distributed in the Mekong Delta, Vietnam

Kawahigashi¹,

Minh²,

Nguyen³

et al. 2008

Soil Science and Plant Nutrition

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“…The main constraints of tidal land for plant growth are water-saturated and anaerobic condition in rhizosphere; presence of pyrite or sulfidic materials; toxicity of Al, Fe and Mn; very acid soil reaction; and low N, P, K, Ca and Mg contents (Muhrizal et al, 2006;Kawahigashi et al, 2008;Anda et al, 2009). Oxidation of pyrite increases concentration of Al, Mn and Fe 3+ , as well as decreases soil pH and macro nutrients availability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Lime Application on Soil Properties and Soybean Yield on Tidal Land

Wijanarko

Taufiq

2016

Agrivita.J.Agr.Sci

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The problems of soybean cultivation on tidal land are low in soil fertility, aluminum (Al) toxicity and poor availability of macro nutrients. Soil acidity and Al toxicity are often fixed by liming. The research aimed to determine the calculation method of lime requirement and its application method for soybean on tidal land. The research was conducted on tidal land in South Kalimantan, Indonesia. Treatment consisted of two factors and arranged in randomize complete block design, replicated three times. The first factor was the method of lime rate calculation: (1) no liming, (2) liming based on 10% of Al saturation, (3) liming based on 20% of Al saturation, (4) liming based on 30% of Al saturation, (5) liming based on 0.5 x exchangeable Al, and (6) liming based on 1 x exchangeable Al. The second factor was the method of application: (1) surface and (2) mixed within 20 cm soil depth. The results showed that liming by mixing dolomite with soil within 20 cm depth resulted in 8% higher plant height compared to that applied on the soil surface. The highest yield was obtained when liming at rate equivalent to 10% of Al saturation was mixed with soil within 20 cm depth.

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“…Only the lowest areas remained submerged year round. Over the years, the lower water and groundwater level started to drop, and the soils became transformed into acidic sulphate soils by the oxidation of the pyrites containing sediments (Dent, 1992;Kawahigashi et al, 2008). The effects of soil acidification on the native wetland vegetation have included the loss of species diversity and a change in the dominant vegetation species (Triet, 2000).…”

Section: Environmental and Land Use Changementioning

confidence: 99%

“…The construction of canals and drainage has triggered a series of unforeseen changes in soil properties associated with the transformation of a potentially acidic condition into an actual acidic condition (Hashimoto, 2001;Minh et al, 1997b). The increased acidification of soils (and the formation of active acid sulphate soils (AASS)) and waterways has resulted in rice crops giving low yields (with occasional total crop failure), with more general effects of the decline in soil pH associated with active acid sulphate soil formation which is imposing an increasing threat to agricultural production (Kawahigashi et al, 2008;Tuong, 1993). The main ecological detriments of the acid sulphate soils are habitat degradation and poor plant productivity.…”

Section: Hydrology and Land Usementioning

confidence: 99%

“…Published estimates of peatland soil carbon and Melaleuca forest reserves in UMH (Le, 2010a) and soil analysis for Ha Tien grassland were used (Kawahigashi et al, 2008;Minh et al, 1998;Sumida et al, 2012). The carbon stock of Melaleuca forests in UMHNP was computed by applying the methods suggested by Tran (2015a).…”

Section: Carbon Stock Estimation In Remnant Wetlands In Mekong Deltamentioning

confidence: 99%

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A study of the drivers of land use change in the Ha Tien Plain region of the Mekong Delta, Vietnam

Nguyen¹

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The wetlands of the Mekong Delta (MD) have contributed prominently to economic development in Vietnam, especially to agricultural and fisheries development. Unfortunately, the design of wetland utilization has traditionally been considered from an economic rather than ecological perspective, and wetlands utilization has suffered from a lack of scientific guidance. Many wetlands have been lost because their full value to society was not taken into account. Furthermore, the status of the delta's biodiversity is both poorly known and poorly documented. Decades of over-exploitation of the wetland ecosystems have had detrimental effects on the environment. The maintenance of the important economic functions of the MD is dependent on maintaining the wetlands' ecosystem functions.This thesis addresses several gaps in the broader wetland conservation literature by focusing on the research problem "How can the drivers of land use change in the study area be better managed to lead to more sustainable outcomes?" Using Systems Thinking in combination with Bayesian Belief Networks modelling methods, and a case study of the Phu My Lepironia grassland biodiversity conservation in Kien Giang, Vietnam, this thesis examines how successful community-based wetlands conservation can be achieved in the Mekong Delta. The study is comprised of the following components: (1) a review of the history of the drivers of wetlands degradation in the MD in order to better understand the transformation of the delta's wetlands in different periods, and an analyses of the driving forces of wetland loss and the underlying causes that derive from the differing policies of political regimes; (2) a study of various factors that influence wetlands grassland degradation and the likely consequences of conservation of the wetlands for carbon stocks; and (3) an analysis of the factors affecting how local communities' decide to make changes in their land use practices, and policy interventions that lead to the enhancement of livelihoods and improved sustainability of wetland grassland conservation in the study area.The drivers that have contributed to wetland loss and degradation in the Mekong Delta over the course of 200 years can be divided into five periods. The drivers of wetland losses have included: (1) resettlement and economic development policies; (2) population growth and urbanization; (3) demand for food and reclamation of wetlands for agriculture, construction of canals and construction of dikes for flood protection systems; (4) expansion of travel systems (waterways and roads); and (5) exploitation of wetlands natural resources. As a result of these factors, only 0.068 million ha of the original 4.0 million ha of the MD currently remain as a primary swamp forest ecosystem.ii The analysis presented in this thesis estimates the value of CO2 sequestered by different Mekong Delta wetland ecosystems (mangroves, Melaleuca swamps and wetland grasslands) to be between 5.53 Mt CO2e for grasslands ecosystem to 37.49 Mt CO2e for mangrove ecosystem...

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Effect of land developmental process on soil solution chemistry in acid sulfate soils distributed in the Mekong Delta, Vietnam

Cited by 19 publications

References 29 publications

Effects of drying on the release of solutes from acid sulfate soils distributed in the Mekong Delta, Vietnam

Effects of drying on the release of solutes from acid sulfate soils distributed in the Mekong Delta, Vietnam

Effect of Lime Application on Soil Properties and Soybean Yield on Tidal Land

A study of the drivers of land use change in the Ha Tien Plain region of the Mekong Delta, Vietnam

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