Microaggregate Stability of Tropical Soils and its Roles on Soil Erosion Hazard Prediction

Igwe, C. A.; Obalum, Sunday E.

doi:10.5772/52473

Cited by 22 publications

(28 citation statements)

References 48 publications

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“…Soil organic matter was not determined in the present study, but the soils are known to be typically low in organic matter (Obalum et al, 2013), hence the generally insignificant drying-induced differences in extractable phosphorus. Peltovuori and Soinne (2005) argue that the destruction of organomineral complexes by air-drying simultaneously releases phosphorus and exposes new surfaces on which phosphorus could sorb.…”

Section: Resultsmentioning

confidence: 85%

“…This observation rather suggests that, in the soil-water suspension without a dispersing agent, some flocculated clay particles could not be dispersed and so posed as silt particles, and this resulted in the high CFI and hence high colloidal stability of the soils. The next to Nando in terms of fineness of soil texture is Akaeze but it showed the lowest CFI and hence the lowest stability, an indication that clay flocculation and colloidal stability are not attributes of fine soil texture, but of other soil factors (Mbagwu and Schwertmann, 2006;Igwe and Obalum, 2013). Table 3 shows that, for both uplands and lowlands of the four locations, soil pH tended to be lower in air-dried samples compared to the field-moist samples, and that the only cases of significant differences were in the lowland soils -Akaeze for pH in both water and KCl, Omasi for pH in water and Nando for pH in KCl.…”

Section: Resultsmentioning

confidence: 99%

“…The following easily measurable colloidal stability indices of the soils were derived after mechanical analysis for particle size distribution (Igwe and Obalum, 2013 …”

Section: Soil Colloidal Stability Indicesmentioning

confidence: 99%

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Air-Drying Effect on Soil Reaction and Phosphorus Extractability From Upland-Lowland Tropical Soils as Related to Their Colloidal Stability

Obalum¹

2017

Appl Ecol Env Res

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Abstract. Although air-drying is a universally accepted practice for preserving soils before analyses, it can irreversibly affect certain soil processes and, hence, results of soil analyses. Reports about such effects on extractable/available phosphorus (P av ) are conflicting and are scanty for low-P av tropical soils. Moreover, little is known about its relative effects for well and poorly drained soils or about any underlying role of soil colloidal stability. In this study, soil samples from well-drained uplands and adjoining poorly drained lowlands in four locations in southeastern Nigeria were analysed field-moist and air-dried for pH and P av . The soils are mostly medium-textured. A trend existed of drying-induced decreases in soil pH for both uplands (4.8-5.8) and lowlands (4.6-5.6); whereas this effect was consistently non-significant in the former (unless tested for irrespective of location, 5.35 vs 5.53), it was location-specific in the latter. Airdrying tended to increase and decrease P av in upland soils (0.62-12.75 mg kg -1 ) and lowland soils (0.93-20.52 mg kg -1 ), respectively, with a reverse effect in one lowland with values exceeding 15 mg kg -1 . However, these effects were non-significant except in one upland soil with evidence of appreciable organic matter. Correlations between soil pH and P av were positive and non-significant, but strongest for field-moist lowland soils. Soil colloidal stability indices of water-dispersible clay and clay flocculation index proved useful in understanding the results for soil pH and P av , respectively, with the effect of the former being more distinct than that of the latter. Air-drying is still recommended only for upland soils while we explore fully the interrelationships among drying-induced differences and colloidal stability for soils of contrasting drainage status.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

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Air-Drying Effect on Soil Reaction and Phosphorus Extractability From Upland-Lowland Tropical Soils as Related to Their Colloidal Stability

Obalum¹

2017

Appl Ecol Env Res

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“…Le , Le Bissonnais and Arrouyas (1997), Barthès et al (2000) and Barthès and Roose (2002) have proved and stressed the significance of aggregate stability for the assessment of soil erodibility. Moreover, Shi et al (2010) concluded that soil aggregation characterization is an appropriate indicator of a soil's susceptibility to interrill erosion whilst Igwe and Obalum (2013) showed the importance of microaggregate stability as an indicator of soil erodibility.…”

Section: Introductionmentioning

confidence: 99%

Physical indicators of soil erosion, aggregate stability and erodibility

Nciizah

Wakindiki

2014

Archives of Agronomy and Soil Science

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The sustained interest in soil erosion research is an indication of both its importance and the lack of definite solutions that can halt its negative impacts on the environment. This study reviewed the literature on trends, new perspectives, gaps and conflicts in soil erosion studies in the South African context. The suitability of using the relationship between aggregate stability and interrill erodibility as a predictor of the soil susceptibility to erosion was also investigated. This relationship is often used instead of the expensive and time-consuming in situ soil erosion studies and models. There are contradictory reports on its ability to offer quick results on the susceptibility of soil to erosion. However, the reviewed South African and international literature showed that aggregate stability is a widely used physical indicator of soil interrill erodibility. Nevertheless, there is no general agreement on the most suitable aggregate stability indices to use.

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“…Studies carried out by [22,35,40] reported a positive correlation between landuse changes and loss of soil quality especially chemical properties and soil aggregate stability which is considered a soil quality indicator that provides information on the soils ability to function as a basic component of the ecosystem. [39] reported a strong dependence of tropical rainforest soils.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Soil Quality in Relation to Landuse Effect in Akamkpa, Cross River State – Nigeria

Uquetan¹,

Eze²,

Uttah³

et al. 2017

AEES

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Soil quality variation in the tropical rainforest zone of Akamkpa upon conversion from the natural vegetation to other landuse types (natural forest, reforested lands, cultivated upland soils, swamps, soils around quarry sites, built-up areas and fallow lands) was evaluated with a view to ascertain the changes in physical, chemical and biological characteristics of the soils and determine to what extent these changes affects soil quality degradation rates and vulnerability potential. Surface soil samples were collected from four points in each landuse type at the depth of 0-15cm and mixed to obtain a composite sample for routine laboratory analysis of selected soil quality parameters. The soils were generally sandy loam to clay loam on the surface and lateritic clay at the subsurface. Bulk density varied from 1.12-1.48mgcm 3 , soil porosity was higher in cultivated soil (78.83%) and lower in the swamps (25.22%) water holding capacity was highest in swamps (72.9%) and lowest in the built-up areas (33.6%). Aggregate stability index was lower in the cultivated soils (0.44) and higher in the natural forest (0.69). pH value varied from 4.2-6.0, organic carbon levels were higher in the natural forest (9.84gkg) and lowest in built-up areas (4.16gkg -1 ). Total nitrogen varied from 0.42-0.72gkg, the value was lowest in built-up areas and highest in the natural forest soils. C:N ratio varied from 8.63-13.12. these values were lowest in cultivated soils than natural forest and reforested soils. Available P was highest in fallow lands and lowest in built-up areas. Exchangeable bases show variability across landuse types with calclium, potassium, ECEC higher in natural forest soils. Al 3+ , SAR, Fe, Mn, Cu and S higher were in soils around quarry mines than any other landuse type. Reforested lands, cultivated uplands and fallow lands showed a slight variability in the selected chemical parameters. The biological properties were highly correlated with soil quality status in response to landuse change types. Total microbial biomass was higher in reforested lands and lowest in built-up areas, while active microbial biomas was higher in fallow lands. Higher rates of qCO 2 :T for the cultivated soils, qCO 2 :A rates was higher for fallow lands. Resuts revealed that built-up areas and soils around quarry mines has a significantly ower SDR/VP than any other landuse type. Percentage soil quality rating was higher in the fallow land (88.0%), forested lands and reforested lands (83.3%), cultivated uplands (66.0%) swamps (56%), soils around quarry mines (44%) and built-up areas (33%). The findings suggest that the soils under fallow are slightly capable to resist degradation. Management practices such as planting leguminous crops, increased fallow period, organic manuring, planting of fast growing vegetative species and returning crop residues to the soil as a way of building up used carbon stocks.

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Microaggregate Stability of Tropical Soils and its Roles on Soil Erosion Hazard Prediction

Cited by 22 publications

References 48 publications

Air-Drying Effect on Soil Reaction and Phosphorus Extractability From Upland-Lowland Tropical Soils as Related to Their Colloidal Stability

Air-Drying Effect on Soil Reaction and Phosphorus Extractability From Upland-Lowland Tropical Soils as Related to Their Colloidal Stability

Physical indicators of soil erosion, aggregate stability and erodibility

Evaluation of Soil Quality in Relation to Landuse Effect in Akamkpa, Cross River State – Nigeria

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