Soil solution composition, water tables, and redox potentials of anthraquic ultisols in a toposequence
Journal
Soil Science
Journal Volume
165
Journal Volume
165
Journal Issue
11
Journal Issue
11
Pages
869-880
Start Page
869
End Page
880
ISSN
0038075X
Date Issued
2000
Author(s)
Abstract
This study examines the relationship of soil solution composition, water table, and redox potential (Eh) in three rice-growing Ultisols of the Chungli Terrace toposequence in northern Taiwan. The three soil series were Houhu (Typic Plinthaquult), Hsinwu (Typic Plinthaquult), and Lungchung (Plinthaquic Paleudult). Water tables and redox potentials were monitored in 1996 and 1997. Soil solutions were collected in 1997 at different depths by the tension free method. Redoximorphic features were consistently found in the Btv horizons of the three pedons. Sodium, calcium, and sulfate were the dominant ions in soil solutions at different depths. Decreased concentrations of Na, Mg, Mn, and Cl were associated with increasing elevation in this toposequence, and this trend was then related to the soil moisture regime and the distance from the sea. There was much more Mn than Fe in the soil solution. The low concentration of Fe in the soil solution was the result of low Fe activity ratio (Fe0/Fed) associated with low organic carbon content in the soils; it was also caused by dilution of the irrigation water utilized for rice production. Manganese is more highly correlated than Fe with the concentration in the soil solution and the redox regime.
Subjects
Anthraquic conditions
Redox potential
Redoximorphic features
Soil solution
Water table
SDGs
Publisher
Lippincott Williams and Wilkins
Type
journal article