Particulate organic matter, soil texture and mineralogy relations in some Eastern Cape ecotopes in South Africa

Nciizah, Adornis D.; Wakindiki, Isaiah I.C.

doi:10.1080/02571862.2012.688882

Cited by 34 publications

(20 citation statements)

References 28 publications

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“…Particulate organic matter (POM) is the most active and labile pool of SOM promoting soil aggregate stability (Blanco-Canqui and Lal 2004). This transient pool of SOM accounted for 16-39% of total SOM in some South African soils (Nciizah and Wakindiki 2012), which was similar to 20-37% observed in some soils of eastern Canada and the USA (Carter et al 2003).…”

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confidence: 87%

Aggregate breakdown mechanisms as affected by soil texture and organic matter in soils dominated by primary minerals

Nciizah

Wakindiki

2014

South African Journal of Plant and Soil

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Soil aggregates breakdown mechanisms depend on soil properties such as texture, clay mineralogy and organic matter content. Little is known about the effect of soil properties on aggregate breakdown mechanisms in South African soils. The objective of this study was to establish the relationship between aggregate breakdown mechanisms and selected soil properties in some South African soils dominated by primary minerals. Soil samples with varying properties were collected from the surface 0-0.2 m from 14 ecotopes in Eastern Cape province. Aggregate stability was determined following the fast wetting (FW), slow wetting (SW) and wet stirring (WSt) methods. Soils with high quartz were the least stable due to its inability to bond with other clay minerals or soil organic matter (SOM). In contrast, soils with high kaolinite were the most stable. Slaking was the dominant aggregate breakdown mechanism in most of the studied soils. Aggregate stability was significantly correlated with particulate organic matter (POM) for FW (r 2  0.74, P  0.05) and SW (r 2  0.64, P  0.05). It was concluded that increasing POM content in soils through SOM inputs and farming methods that reduce POM mineralisation can reduce slaking during rapid wetting by raindrops.

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confidence: 87%

Aggregate breakdown mechanisms as affected by soil texture and organic matter in soils dominated by primary minerals

Nciizah

Wakindiki

2014

South African Journal of Plant and Soil

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“…These authors include (Maqubela et al 2009;Materechera 2009;Mupambwa & Wakindiki 2012;Nciizah & Wakindiki 2012. In all these studies well-established relationships between aggregate stability and soil erosion were 8…”

Section: Soil Erosion Process and Physical Soil Erosion Indicatorsmentioning

confidence: 98%

“…The inoculated soils had a higher proportion of stable aggregates, improved the water holding and infiltration capacities of the soils and hence less erosion. Nciizah and Wakindiki (2012) worked on similar soils to those used by Materechera (2009) in a study aimed at determining the effect of cattle manure on aggregate stability and strength in some hardsetting soils. Aggregate stability was increased by approximately 51%, because cattle manure prevented aggregates from slaking upon wetting and significantly increased the proportion of the WSA.…”

Section: Soil Erosion Process and Physical Soil Erosion Indicatorsmentioning

confidence: 99%

“…According to Mandiringana et al (2005) and Nciizah and Wakindiki (2012) soils in the central parts of the Eastern Cape province in South Africa are dominated quartz and are thus highly dispersive. Characterizing the stability of the soils at both macroaggregate and microaggregate scales is thus important in determining the erodibility of the soil.…”

Section: Microorganismsmentioning

confidence: 99%

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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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“…Soil organic matter is stabilized as POM occluded within aggregates, which in turn is related to the degree of aggregation (Six et al, 1999). This suggests that the stability of POM is directly related to soil aggregate stability (Nciizah & Wakindiki, 2012). Blanco-Canqui & Lal (2004) and Li et al (2011) observed that the stability of POM was influenced by the quality of SOM and the mechanism of protection that is offered by the minerals within the soil matrix.…”

Section: Introductionmentioning

confidence: 99%

Effects of litter source on the dynamics of particulate organic matter fractions and rates of macroaggregate turnover in different soil horizons

Parwada

Tol

2018

European J Soil Science

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Summary Soil texture influences the transformation of soil organic matter (SOM), and depletion and reduction in the number of macroaggregates. However, the extent of changes in SOM in response to its quality and mechanisms of stabilization in different types of soil texture is unclear. We evaluated changes in SOM during a 30‐week incubation experiment using seven soils mixed with two sources of litter; Vachellia karroo (Hayne) Banfi & Galasso leaf and Zea mays L. stover. We hypothesized that changes in intraparticulate organic matter (iPOM) are influenced by litter quality • soil type • time interactions, which affect rates of turnover of macroaggregates. A completely randomized design was used in arranging soil jars in the incubator. Free light fractions and coarse and fine iPOM within macroaggregates (>250 μm) decreased exponentially from week 1 to 30 and were significantly (P < 0.05) affected by litter source • soil horizon • time interactions. Trends of changes in fine iPOM fractions were the same in macroaggregates and microaggregates (P < 0.05). The greatest changes in POM fractions occurred 8 weeks after litter incorporation. Both V. karroo leaf and Z. mays stover stabilized macroaggregates during the first 8 weeks after incubation; thereafter they lost their influence. Therefore, we needed to reapply fresh litter after this period. Changes in iPOM fractions and macroaggregate turnover were specific to a soil type, suggesting that different sources of litter have different stabilizing effects in macroaggregates. Soil macroaggregate stabilization and changes in iPOM could be used as indicators to apply more appropriate management practices for soil protection or productivity. Highlights Does the source of organic matter affect transformation rates of different intraparticulate organic matter in the soil? Degradation of organic matter into very fine particulate matter also increases the rate of turnover of macroaggregates. Soil type • litter source interactions greatly influenced the rate of transformation from coarse to fine intraparticulate fractions. Effects of litter quality on dynamics of POM fractions in aggregates and macroaggregate turnover were horizon specific.

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Particulate organic matter, soil texture and mineralogy relations in some Eastern Cape ecotopes in South Africa

Cited by 34 publications

References 28 publications

Aggregate breakdown mechanisms as affected by soil texture and organic matter in soils dominated by primary minerals

Aggregate breakdown mechanisms as affected by soil texture and organic matter in soils dominated by primary minerals

Physical indicators of soil erosion, aggregate stability and erodibility

Effects of litter source on the dynamics of particulate organic matter fractions and rates of macroaggregate turnover in different soil horizons

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