Effects of soil depth on the dynamics of selected soil  properties among the highlands resources of Northeast Wollega, Ethiopia: are these sign of degradation?

Adugna, A.; Abegaz, Assefa

doi:10.5194/sed-7-2011-2015

Cited by 31 publications

(26 citation statements)

References 21 publications

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“…This finding is in accordance with (Adugna & Abegaz, 2015;Negasa, 2020). Even though, the fact that the measured pH values in both natural bamboo forest and cultivated land uses of the subsurface lie within the optimal ranges (6-7.5), we observed that deforestation and subsequent cultivation can lead to rise in soil pH (Table 4).…”

Section: Soil Ph Soil Organic Carbon and Total N Contentssupporting

confidence: 88%

Lowland Bamboo (Oxytenanthera abyssinica) Deforestation and Subsequent Cultivation Effects on Soil Physico-Chemical Properties in Southwestern Ethiopia

Tadesse¹,

Abere²,

Bayu³

et al. 2021

Preprint

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In Ethiopia, bamboo thickets and woodlands play an important role in soil-water conservation and climate change mitigation in arid and semi-arid regions. However, bamboo mass flower-ing, rapid demographic changes and expansion of agricultural investments to bamboo domi-nated areas have led to deforestation and land degradation. In this study, we determined the effects of deforestation and subsequent cultivation on soil physical and chemical properties along a chronosequence of closely located agricultural lands with different ages (1, 3, 5 and 7 years) since converted from natural lowland bamboo forest. Hence, soil samples (n = 90) have been taken from both natural bamboo forests and adjacent agricultural lands at two soil depths (0-20 cm and 20-40 cm). Our result showed that CEC, K+, Ca+, Mg+ and available P were varied significantly with respect to cultivation periods and soil depth, while soil pH and Na+ varied with soil depth (P < 0.001). Soil C and total N contents (g/kg) in 0-20 cm soil layer declined significantly and exponentially with increasing years under cultivation. Conversion of natural bamboo forest to cropland during the past seven-year period significantly increased soil pH with soil depths, while CEC was declined throughout the cultivation period and soil depth. In general, the result revealed that conversion of natural lowland bamboo and subsequent cultivation of soil had negative effects on measured soil physicochemical properties.

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Section: Soil Ph Soil Organic Carbon and Total N Contentssupporting

confidence: 88%

Lowland Bamboo (Oxytenanthera abyssinica) Deforestation and Subsequent Cultivation Effects on Soil Physico-Chemical Properties in Southwestern Ethiopia

Tadesse¹,

Abere²,

Bayu³

et al. 2021

Preprint

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“…The clay and SOM contents influence the CEC of the soils (Soares and Alleoni, 2008;Adugna and Abegaz, 2015;Nesic et al, 2015), a contrary fact was observed by Saidian et al (2016), who reported that CEC values were related to the clay type (smectite versus kaolinite) present in the soil and were independent of the SOM content and its degree of decomposition (Chapman, 1965;Sumner and Miller, 1996). Hobley and Wilson (2016) reported that carbon content is influenced by land use and climatic factors.…”

Section: Introductionmentioning

confidence: 96%

Contribution of the chemical and mineralogical properties of sandy-loam tropical soils to the cation exchange capacity

Costa¹,

Souza²,

Canton³

et al. 2020

Revista Brasileira De Ciência Do Solo

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Soils originating from the Caiuá sandstone formation have low soil organic matter (SOM), clay content, and cation exchange capacity (CEC). The predominance of one component over the other might decisively influence the CEC of these soils. Particle size distribution and selective dissolution procedures associated to a suit of methods to determine the exchangeable capacity properties might clarify the relative importance of each soil component. The objective of this work was to evaluate the contribution of the different components of the solid fraction and their intrinsic attributes to the CEC of sandy-loam soils and their relation to the total organic carbon (TOC), C:N ratio, and soil mineralogy. For this purpose, 34 soil samples were selected from the Caiuá sandstone formation with significant variation in the carbon content. Clay size fraction was characterized by X-ray diffraction, routine chemical analysis, and total specific surface area-SSA T using EGME, before and after the removal of SOM with sodium hypochlorite solution. Different values of CEC and effective cation exchange capacity (ECEC) were determined following standard procedures. The soils presented high sand content (82.9 ± 5.9 %) and the mineralogy of the clay fraction is dominated by kaolinite (>80 %) with the presence of illite, 2:1 clay minerals, and small amounts of iron and aluminum oxides. The CEC and ECEC values at pH 7.0 and ~5.6, respectively due to the SOM are 408.6 and 148.7 cmol c kg-1 of carbon, respectively. The SOM was responsible for 32 to 84 % (average 52 %) and 24 to 67 % (average of 46 %) of the CEC and ECEC of the soils, respectively. The CEC and ECEC of the inorganic fraction are 2.32 and 0.78 cmol c kg-1 of minerals, respectively. The CEC of the clay fraction increased with the TOC but decreased exponentially with the clay content. The total carbon content increased linearly with the C/N ratio. The SSA T showed a significant (p<0.05) and positive correlation with the TOC and with the CEC of the soils.

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“…Similarly, Elissa and Harry () also observed poor relationship between CEC and clay. Further, many researchers observed deviation from the usual high correlation between CEC and clay and attributed it to intensity of cultivation (Shrestha, Singh, Sitaula, Lal, & Bhattacharyya, ); variation in soil depth (Adugna & Abegaz, ; He, Wu, Wang, & Han, ) and structure and type of clay minerals (Vogel et al, ; Yang, Drury, Reynolds, & Yang, ).…”

Section: Resultsmentioning

confidence: 99%

A conceptual model of natural land degradation based on regressive pedogenesis in semiarid tropical environments

et al. 2018

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Land degradation occurs in all the climatic regions, however, the adverse effects are more pronounced in the semiarid tropical (SAT) environments due to increasing aridity and water scarcity. Though natural processes can also cause land degradation, it is generally attributed to anthropogenic factors. In this study, we elucidate the role of climate and landscape driven soil forming processes in land degradation through a conceptual model. For this, morphological, physical, and chemical properties of the soils occurring in a part of the SAT Deccan Plateau region, India, were characterized. The trend of climatic variables, namely, the mean annual rainfall, potential evapotranspiration, and maximum summer temperature during the last century (1901–2010) showed that the increase in aridity negatively influenced the soil forming processes. The results showed that rainfall variability, temperature, potential evapotranspiration, and hydrological behaviour of the SAT soils were the primary drivers of the soil forming processes and they were identified through examination of the soil variability by factor analysis. The depth distribution of selected indicators (% clay, pH, calcium carbonate, exchangeable sodium percentage, exchangeable magnesium percentage, and hydraulic conductivity) indicated that the current pedogenic processes operating in the SAT environment caused the undesirable modification in soil properties. Through our conceptual model, we discuss the mechanism of the formation of pedogenic carbonate, subsoil sodicity, and subsequent reduction in hydraulic conductivity which leads to the land and vegetation degradation in the SAT environments.

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Effects of soil depth on the dynamics of selected soil properties among the highlands resources of Northeast Wollega, Ethiopia: are these sign of degradation?

Cited by 31 publications

References 21 publications

Lowland Bamboo (Oxytenanthera abyssinica) Deforestation and Subsequent Cultivation Effects on Soil Physico-Chemical Properties in Southwestern Ethiopia

Lowland Bamboo (Oxytenanthera abyssinica) Deforestation and Subsequent Cultivation Effects on Soil Physico-Chemical Properties in Southwestern Ethiopia

Contribution of the chemical and mineralogical properties of sandy-loam tropical soils to the cation exchange capacity

A conceptual model of natural land degradation based on regressive pedogenesis in semiarid tropical environments

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