Pedogenic evolution of paddy soils in different soil landscapes

Zhang, Gan‐Lin; Gong, Zelin

doi:10.1016/s0016-7061(03)00072-7

Cited by 76 publications

(53 citation statements)

References 7 publications

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“…Paddy cultivation takes place on lower topographic positions on LHG and alluvial soils, creating concentration of Fe-Mn oxides and clays (Zhang and Gong 2003) together with subsoil hardpans with reduced infiltration (IUSS Working Group, 2006, Kawaguchi and Kyuma, 1977, Zhang and Gong, 2003. Swidden cultivation (locally called chena) takes place on the higher landscape positions in RBE soils with at least an eight to ten 5 year rotation (Figure 2; Dharmasena, 1994, Siriweera, 1990.…”

Section: Study Area and Contextmentioning

confidence: 99%

The dry tank: development and disuse of water management infrastructure in the Anuradhapura hinterland, Sri Lanka

Gilliland

Simpson

Adderley

et al. 2013

Journal of Archaeological Science

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Section: Study Area and Contextmentioning

confidence: 99%

The dry tank: development and disuse of water management infrastructure in the Anuradhapura hinterland, Sri Lanka

Gilliland

Simpson

Adderley

et al. 2013

Journal of Archaeological Science

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“…On the alluvial plains such as the study area, the soil conditions range from continuously reducing in areas of very shallow groundwater to alternating reduced and oxidized. A zone of fluctuating redox results from rainfall flooding and irrigation submergence followed by periods of subaerial exposure (Zhang and Gong 2003). During paddy cultivation, the soil is usually flooded or kept minimally saturated with fresh water throughout the growing period of the crop (Dudal 1957).…”

Section: Location and Extentmentioning

confidence: 99%

“…The soils formed above these sediments are influenced by alternating redox conditions in response to seasonal flooding. Near the ground surface, where cultivation can produce better soil aeration, crystalline secondary ferric-oxides and their ratio to total iron increase with cultivation age (Zhang and Gong 2003). Brinkman (1977) described the alternating oxidation and reduction of iron as the process of ferrolysis.…”

Section: Introductionmentioning

confidence: 99%

Accumulation of iron and arsenic in the Chandina alluvium of the lower delta plain, Southeastern Bangladesh

Zahid

Hassan

Breit

et al. 2008

Environ Geochem Health

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Accumulations of iron, manganese, and arsenic occur in the Chandina alluvium of southeastern Bangladesh within 2.5 m of the ground surface. These distinctive orange-brown horizons are subhorizontal and consistently occur within 1 m of the contact of the aerated (yellow-brown) and water-saturated (gray) sediment. Ferric oxyhydroxide precipitates that define the horizons form by oxidation of reduced iron in pore waters near the top of the saturated zone when exposed to air in the unsaturated sediment. Hydrous Fe-oxide has a high specific surface area and thus a high adsorption capacity that absorbs the bulk of arsenic also present in the reduced pore water, resulting in accumulations containing as much as 280 ppm arsenic. The steep redox gradient that characterizes the transition of saturated and unsaturated sediment also favors accumulation of manganese oxides in the oxidized sediment. Anomalous concentrations of phosphate and molybdenum also detected in the ferric oxyhydroxide-enriched sediment are attributed to sorption processes.

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“…Paddy soil widely distributed in China and Asia is important resource for food production. In China, more than 30 million hectares located mainly in the area south of the Changjiang River are important rice production regions (Zhang and Gong, 2003) contaminated by Cd in widespread area.…”

Section: Introductionmentioning

confidence: 99%

Toxicity of cadmium to soil microbial biomass and its activity: Effect of incubation time on Cd ecological dose in a paddy soil

Liao

Luo

Xiao-min

et al. 2005

J Zheijang Univ Sci B

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Cadmium (Cd) is ubiquitous in the human environment and has toxic effect on soil microbial biomass or its activity, including microbial biomass carbon (C mic ), dehydrogenase activity (DHA) and basal respiration (BR), etc., C mic , DHA, BR were used as bioindicators of the toxic effect of Cd in soil. This study was conducted to determine the effects of Cd on soil microbial biomass and its activity in a paddy soil. The inhibition of microbial biomass and its activity by different Cd concentrations was described by the kinetic model (M1) and the sigmoid dose-response model (M2) in order to calculate three ecological doses of Cd: ED 50 , ED 10 and ED 5 . Results showed that M2 was better fit than M1 for describing the ecological toxicity dose effect of cadmium on soil microbial biomass and its activity in a paddy soil. M2 for ED values (mg/kg soil) of C mic , DHA, BR best fitted the measured paddy soil bioindicators. M2 showed that all ED values (mg/kg) increased in turn with increased incubation time. ED 50 , ED 10 and ED 5 of C mic with M2 were increased in turn from 403.2, 141.1, 100.4 to 1000.7, 230.9, 144.8, respectively, after 10 d to 60 d of incubation. ED 50 , ED 10 and ED 5 of DHA with M2 increased in turn from 67.6, 6.2, 1.5 to 101.1, 50.9, 41.0, respectively, after 10 d to 60 d of incubation. ED 50 , ED 10 and ED 5 of BR with M2 increased in turn from 149.7, 6.5, 1.8 to 156.5, 50.8, 35.5, respectively, after 10 d to 60 d of incubation. So the ecological dose increased in turn with increased incubation time for M2 showed that toxicity of cadmium to soil microbial biomass and its activity was decreased with increased incubation time.

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Pedogenic evolution of paddy soils in different soil landscapes

Cited by 76 publications

References 7 publications

The dry tank: development and disuse of water management infrastructure in the Anuradhapura hinterland, Sri Lanka

The dry tank: development and disuse of water management infrastructure in the Anuradhapura hinterland, Sri Lanka

Accumulation of iron and arsenic in the Chandina alluvium of the lower delta plain, Southeastern Bangladesh

Toxicity of cadmium to soil microbial biomass and its activity: Effect of incubation time on Cd ecological dose in a paddy soil

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