Effects of drying on the release of solutes from acid sulfate soils distributed in the Mekong Delta, Vietnam(Soil Chemistry and Mineralogy)

スポンサーリンク

概要

• 論文の詳細を見る

• 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.

• 社団法人日本土壌肥料学会の論文

著者

• Nguyen Ve

  College Of Agriculture Can Tho University

• Do Nhut

  Agricultural And Rural Development Service Kien Giang Agricultural Extension Center

• KAWAHIGASHI Masayuki

  College of Bioresource Sciences, Nihon University

• SUMIDA Hiroaki

  College of Bioresource Sciences, Nihon University

• Sumida Hiroaki

  Nihon Univ. Kanagawa Jpn

• Sumida Hiroaki

  College Of Bioresource Science Nihon University

• Kawahigashi Masayuki

  College Of Bioresource Sciences Nihon University

• Kawahigashi Masayuki

  College Of Bioresource Science Nihon University

関連論文

• Effects of drying on the release of solutes from acid sulfate soils distributed in the Mekong Delta, Vietnam(Soil Chemistry and Mineralogy)
• Effect of land developmental process on soil solution chemistry in acid sulfate soils distributed in the Mekong Delta, Vietnam(Soil Chemistry and Soil Mineralogy)
• Surface-Active Properties of Particle Size Fractions in Two Humic Acids
• Properties of Soil Humic Substances in Fractions Obtained by Sequential Extraction with Pyrophosphate Solutions at Different pHs : I. Yield and Particle Size Distribution
• Humus composition and physico-chemical properties of humic acids in tropical peat soils under sago palm plantation(Soil Genesis, Classification, and Survey)
• Chemical properties of peat soils and peat soil solutions obtained from Sago palm forest
• Characteristics of newly isolated ammonia-oxidizing bacteria from acid sulfate soil and the rhizoplane of leucaena grown in that soil(Soil Biology)
• Carbon and nitrogen contents and greenhouse gas fluxes of the Eurasian steppe soils with different land-use histories located in the Arkaim museum reserve of South Ural, Russia(Environment)
• Bacterial consortia in iron-deposited colonies formed on paddy soil surface under microaerobic conditions(Soil biology)
• Carbon and nitrogen contents and greenhouse gas fluxes of the Eurasian steppe soils with different land-use histories located in the Arkaim museum reserve of South Ural, Russia

スポンサーリンク