Datum
2021-12-06Schlagwort
630 Landwirtschaft, Veterinärmedizin AngolaArenosolLatosolStatistische AnalyseDegradationTropenSubtropenErosionMetadata
Zur Langanzeige
Aufsatz
Rainfall erosivity, soil erodibility and natural water erosion potential in the Huambo region, Angola
Zusammenfassung
The use of erosion assessment methods is critical for the sustainability of land use in tropical and subtropical regions, especially in countries lacking national information on soil erosion development, which is the case of Angola. This study aimed to evaluate the rainfall erosivity (R), soil erodibility (K), soil loss tolerance (T) and natural erosion potential (NEP) in Huambo (Angola). The R value estimated for a 25-year period was 7463 MJ·mm·ha-¹·h-¹·y-¹. K values estimated from 25 soil profiles, described in the Soil Map of Angola, varied from 0.021 to 0.247 t·ha·h·ha-1·MJ-¹·mm-¹, respectively, in yellow ferralitic and paraferralitic soils (Ferralsols) and brown psamitic soils (Arenosols). A two-principal component (PC) model for soil erodibility variables explained 61.7% of total variance. PC1 was related to particle size distribution and soil erodibility, pointing to a positive correlation between sand content in the soil superficial horizons and K. PC2 expressed soil loss vulnerability, with negative factor loading for soil loss tolerance. The cluster analysis (CA) grouped Arenosols in a significant cluster located in the positive quadrant of PC1, therefore, more erosion prone. The NEP average value found was of 605 t·ha-¹·y-¹. The obtained results raise awareness concerning soil degradation by water erosion and can be of value for decision-makers and for farmers and land users, contributing to the sustainability of agriculture in Huambo.
Zitierform
In: Journal of Agriculture and Rural Development in the Tropics and Subtropics (JARTS) Vol. 122 / No. 2 (2021-12-06) , S. 269-278 ; eissn:2363-6033Sammlung(en)
Vol 122, No 2 (2021) (Journal of Agriculture and Rural Development in the Tropics and Subtropics (JARTS))Zitieren
@article{doi:10.17170/kobra-202110274964,
author={Meira, Ludmila and Oliveira e Silva, Pedro and Tomaz, Alexandra},
title={Rainfall erosivity, soil erodibility and natural water erosion potential in the Huambo region, Angola},
journal={Journal of Agriculture and Rural Development in the Tropics and Subtropics (JARTS)},
year={2021}
}
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2021-12-06T12:19:40Z 2021-12-06T12:19:40Z 2021-12-06 doi:10.17170/kobra-202110274964 http://hdl.handle.net/123456789/13423 eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ arenosols ferralsols multivariate statistical analysis soil degradation tropical and subtropical regions 630 Rainfall erosivity, soil erodibility and natural water erosion potential in the Huambo region, Angola Aufsatz The use of erosion assessment methods is critical for the sustainability of land use in tropical and subtropical regions, especially in countries lacking national information on soil erosion development, which is the case of Angola. This study aimed to evaluate the rainfall erosivity (R), soil erodibility (K), soil loss tolerance (T) and natural erosion potential (NEP) in Huambo (Angola). The R value estimated for a 25-year period was 7463 MJ·mm·ha-¹·h-¹·y-¹. K values estimated from 25 soil profiles, described in the Soil Map of Angola, varied from 0.021 to 0.247 t·ha·h·ha-1·MJ-¹·mm-¹, respectively, in yellow ferralitic and paraferralitic soils (Ferralsols) and brown psamitic soils (Arenosols). A two-principal component (PC) model for soil erodibility variables explained 61.7% of total variance. PC1 was related to particle size distribution and soil erodibility, pointing to a positive correlation between sand content in the soil superficial horizons and K. PC2 expressed soil loss vulnerability, with negative factor loading for soil loss tolerance. The cluster analysis (CA) grouped Arenosols in a significant cluster located in the positive quadrant of PC1, therefore, more erosion prone. The NEP average value found was of 605 t·ha-¹·y-¹. The obtained results raise awareness concerning soil degradation by water erosion and can be of value for decision-makers and for farmers and land users, contributing to the sustainability of agriculture in Huambo. open access Meira, Ludmila Oliveira e Silva, Pedro Tomaz, Alexandra Angola Arenosol Latosol Statistische Analyse Degradation Tropen Subtropen Erosion publishedVersion eissn:2363-6033 No. 2 Journal of Agriculture and Rural Development in the Tropics and Subtropics (JARTS) 269-278 Vol. 122 false
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