Soil Moisture Retention Characteristics in Relation to Erodibility and Texture of Some Soils of Southeastern Nigeria

Igwe, C. A.; Akamigbo, F. O. R.; Mbagwu, J.S.C.

doi:10.4314/eaafj.v68i1.1771

Cited by 4 publications

(6 citation statements)

References 5 publications

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“…Igwe et al . () predicted the SMC from only texture and OM for topsoils in the region that varied markedly in texture but apparently not in structure, as opposed to the ones we studied. In these soils, Igwe () reported that BD could impact negatively on the moisture retained at 10 and 1500 kPa in the top‐(0–30 cm) soil layer.…”

Section: Introductioncontrasting

confidence: 55%

“…The performances of the PTFs by Igwe et al . () and Mdemu and Mulengera () are much worse than those by de Macedo et al . () at higher matric potentials but not at the 1500 kPa.…”

Section: Resultsmentioning

confidence: 58%

“…Igwe et al . () was selected because it was done in the same agro‐ecoregion as the present study. The study by Mdemu and Mulengera () was selected because it was done elsewhere in tropical Africa with soils of low silt content (1–15%) as the ones we studied.…”

Section: Methodsmentioning

confidence: 99%

“…From agronomic standpoint, for instance, it relates directly to the amount of work which plants must do against the energy of soil water to extract water from the soil. The SMC also has engineering and environmental uses because it can influence the shear strength and permeability of soils (Barbour, ), as well as their infiltrability and, consequently, erodibility (Igwe et al ., ; Onweremadu et al ., ). It can also influence the transport of contaminants in the vadose zone.…”

Section: Introductionmentioning

confidence: 96%

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Moisture characteristics and their point pedotransfer functions for coarse‐textured tropical soils differing in structural degradation status

Obalum

Martín

2012

Hydrological Processes

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The effect of soil structure on hydraulic pedotransfer functions (PTFs) in tropical soils with similar mineralogy and texture has not been well documented. Structurally contrasting soils from representative locations in southeastern Nigeria were analyzed for moisture retention at 0, 6, 10, 33, 100, 300 and 1500 kPa among other properties. They were grouped by depth (topsoils or subsoils) and also by their structural degradation status into low‐ and high‐stability soils, corresponding to organic matter (OM):[silt + clay] of <7.5 and >7.5%, respectively. Soil depth and structural stability influenced the soil moisture characteristic curves. The data were fitted to three tropical point PTFs, but none of them proved appropriate for predicting moisture retention in the soils. We therefore derived new ones using multiple linear stepwise regressions before and after the dataset grouping and compared their performances by means of cross‐validation. Moisture retention in the soils (sand content, 73.2–93.8%) could not be calibrated from texture and OM concentration alone, until when bulk density, total porosity and microporosity were included among the regressors. Microporosity's role was particularly outstanding at all matric potentials but the 1500 kPa. The ensuing PTFs represent a good fit for the soil moisture retention data. The two grouping strategies resulted in lower SE of the estimates in some cases, but this did not enhance the performances of the concerned PTFs. At the 1500 kPa, however, the PTF incorporating all datasets performed better than separate PTFs for topsoils/subsoils but worse than the one for high‐stability soils. Information on soil structure can therefore benefit PTF derivation for kaolinite‐dominated, coarse‐textured tropical soils at all the matric potentials considered. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Introductioncontrasting

confidence: 55%

“…The performances of the PTFs by Igwe et al . () and Mdemu and Mulengera () are much worse than those by de Macedo et al . () at higher matric potentials but not at the 1500 kPa.…”

Section: Resultsmentioning

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Moisture characteristics and their point pedotransfer functions for coarse‐textured tropical soils differing in structural degradation status

Obalum

Martín

2012

Hydrological Processes

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“…Mdemu & Mulengera (2002) developed local PTFs to predict water retention at eight different matric potentials and AWC for soils in Morogoro, Tanzania. Point-based PTFs were derived by Igwe et al (2002) to predict water content of some soils of the southeastern part of Nigeria. Tomasella et al (2003) used a large dataset including soils from different geomorphic regions of Brazil to relate basic soil properties to volumetric water contents at different matric potentials (-6, -10, -33, -100, and -1500 kPa).…”

Section: Point-based Ptfsmentioning

confidence: 99%

Pedotransfer functions to predict water retention for soils of the humid tropics: a review

Botula

Ranst

Cornelis

2014

Rev. Bras. Ciênc. Solo

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SUMMARYOver the past three decades, pedotransfer functions (PTFs) have been widely used by soil scientists to estimate soils properties in temperate regions in response to the lack of soil data for these regions. Several authors indicated that little effort has been dedicated to the prediction of soil properties in the humid tropics, where the need for soil property information is of even greater priority. The aim of this paper is to provide an up-to-date repository of past and recently published articles as well as papers from proceedings of events dealing with water-retention PTFs for soils of the humid tropics. Of the 35 publications found in the literature on PTFs for prediction of water retention of soils of the humid tropics, 91 % of the PTFs are based on an empirical approach, and only 9 % are based on a semiphysical approach. Of the empirical PTFs, 97 % are continuous, and 3 % (one) is a class PTF; of the empirical PTFs, 97 % are based on multiple linear and polynomial regression of n th order techniques, and 3 % (one) is based on the k-Nearest Neighbor approach; 84 % of the continuous PTFs are point-based, and 16 % are parameter-based; 97 % of the continuous PTFs are equation-based PTFs, and 3 % (one) is based on pattern recognition. Additionally, it was found that 26 % of the tropical water-retention PTFs were developed for soils in Brazil, 26 % for soils in India, 11 % for soils in other countries in America, and 11 % for soils in other countries in Africa.Index terms: physical soil properties, soil hydraulic properties, tropical soils, data-mining techniques.( Durante as últimas três décadas, as funções de pedotransferência (FPTs) foram amplamente utilizadas pelos cientistas para estimar propriedades de solos em regiões temperadas para responder à falta de banco de dados deles. Diferentes autores indicaram que poucos esforços foram dedicados à estimação de propriedades de solo nos trópicos úmidos, onde a necessidade de informações sobre as propriedades dos solos é ainda mais prioritária. Este artigo buscou proporcionar um inventário atualizado dos artigos, assim como trabalhos publicados recentemente em anais de congressos sobre FPTs com retenção de água para solos nos trópicos úmidos. Entre 35 publicações encontradas na literatura sobre as FPTs para a estimação da retenção de água dos solos nos trópicos úmidos, 91 % dos FPTs estão com base num enfoque empírico e somente 9 %, num enfoque semifísico. Das FPTs empíricas, 97 % são contínuas e 3 % (uma) é uma classe. Das FPTs empíricas, 97 % são com base em regressão multilinear e polinomial de n técnicas de ordenamento e 3 % (uma), no método k-NN; 84 % das FPTs contínuas são com base em pontos e 16 %, em parâmetros; 97 % das FPTs contínuas são baseadas em equação e 3 % (uma), no reconhecimento padrão. Adicionalmente, foi encontrado que 26 % das FPTs da retenção de água "tropical" foram desenvolvidas para solos no Brasil; 26 % , na Índia; 11 %, em outros países na América; e 11 %, em outros países na África.Termos de indexação: meteorização de solos, sol...

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Pedology of Near Gully Sites and its Implications on the Erodibility of Soils in Central South Eastern Nigeria

Onweremadu¹

2007

Research J. of Environmental Sciences

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Soil Moisture Retention Characteristics in Relation to Erodibility and Texture of Some Soils of Southeastern Nigeria

Cited by 4 publications

References 5 publications

Moisture characteristics and their point pedotransfer functions for coarse‐textured tropical soils differing in structural degradation status

Moisture characteristics and their point pedotransfer functions for coarse‐textured tropical soils differing in structural degradation status

Pedotransfer functions to predict water retention for soils of the humid tropics: a review

Pedology of Near Gully Sites and its Implications on the Erodibility of Soils in Central South Eastern Nigeria

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