Aggregate stability of four soils as evaluated by different indices

Nweke, I. A.; Nnabude, P. C.

doi:10.18006/2015.3(3).246.252

Cited by 6 publications

(1 citation statement)

References 23 publications

(29 reference statements)

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“…In addition, positive correlations were obtained between MWD and soil OC (r=0.66; P<0.05) and MB-C (r=0.64; P<0.05). Different experiments have demonstrated that aggregate stability increases when clay and organic matter accumulation increase, confirming the role of these soil properties in soil aggregation (Norton et al, 2006;Nweke and Nnabude, 2015). Aziz and Karim (2016) monitored in the climatological region of Iraqi Kurdistan region with different uses of agricultural land certain soil properties in relation to soil aggregates.…”

Section: Dry Mean Weight Diametermentioning

confidence: 74%

Aggregate stability and carbon and N dymamics in macroaggregate size fractions with different soil texture

Sbih,

Bounouara,

Bensid

et al. 2024

EJSS

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Soil nutrient cycling, the distribution of soil aggregates, and their stability are directly influenced by soil texture. Different sizes of soil aggregates provide microhabitats for microorganisms and therefore influence soil carbon (C) and nitrogen (N) mineralization. The purpose of the present study was to assess the aggregate stability and dynamics of carbon and nitrogen in macroaggregate size fractions (1-8 mm) with different clay content from meadow soils. Surface soil samples (0-15 cm) were collected from 4- to 5-year-old forage crops. Four macroaggregate size classes were isolated by dry sieving and analyzed for their mass proportions: fine macroaggregates (FM) (less than 1 mm), medium-fine macroaggregates (MFM) (1-2 mm), medium-coarse macroaggregates (MCM) (2-4 mm), and large-coarse macroaggregates (LCM) (4-8 mm). The dry mean weight diameter (MWD), organic carbon (OC), total nitrogen (TN), carbon and nitrogen of microbial biomass (C-MB, N-MB) were determined. CO2 emission and net nitrogen mineralized (NM) were measured after 14 weeks of incubation. The amounts of FM were significantly lower than those of intermediate macroaggregates (MCM and MFM) and decreased markedly with increasing clay content within soil macroaggregates. In general, the amounts of macroaggregate size fractions were lowest in soils with high clay content. MWD exhibited a significant correlation with particle size distribution, OC, and MB-C. OC, TN, MB-C, and MB-N contents within macroaggregates increased with decreasing macroaggregate size and increasing clay content of macroaggregate fractions. The CO2 emission and NM content increased with increasing macroaggregate size, indicating higher organic C and N mineralization activity in larger macroaggregates. Mineralization of OC was lowest in macroaggregate fractions with the highest clay content. We conclude that clay content can increase the protection of microbial biomass in meadow soils. Small macroaggregates tend to contain more recalcitrant organic matter compared to larger macroaggregates.

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Section: Dry Mean Weight Diametermentioning

confidence: 74%

Aggregate stability and carbon and N dymamics in macroaggregate size fractions with different soil texture

Sbih,

Bounouara,

Bensid

et al. 2024

EJSS

View full text Add to dashboard Cite

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Dynamics of Organic Carbon Fractions, Soil Fertility, and Aggregates Affected by Diverse Land-Use Cultivation Systems in Semiarid Degraded Land

Kubar,

Ali,

Kalhoro

et al. 2023

J Soil Sci Plant Nutr

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Soil aggregates stability and storage of soil organic carbon respond to cropping systems on Black Soils of Northeast China

Zhou

Liu

Wang³

et al. 2020

Sci Rep

106

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Monoculture and improper management may reduce soil fertility and deteriorate soil structure in Black soils (Mollisols) of Northeast China. The experiment was carried out from 2015 to 2016 in Black Soils comprising five cropping systems: continuous corn (CC), soybean-corn rotation (SC), cornsoybean rotation (CS), fallow-corn (FC), and fallow-soybean (FS). Our results showed that CS and FS treatments significantly increased mean weight diameter (MWD) and fractal dimension (D) in mechanical stability aggregates (MSAs), and increased MWD and geometric mean diameter (GMD) in water-stable aggregates (WSAs) compared with CC treatment. These two treatments were also significantly increased water-stable aggregates stability rate (WSAR), but decreased percentage of aggregates destruction (PAD) than CC treatment. Meanwhile, CS and FS treatments exhibited a higher carbon accumulation than cc treatment in bulk soils. Soil organic carbon (Soc) concentration in WSA 0.106-0.25 ,WSA 2-5 mm and WSA 0.5-1 mm had a dominant effect on aggregate stability. Simutaneously, Soc in WSA >5 mm affected SOC concentration in bulk soils. As a whole, the CS and FS treatments can increase the percentage of macro-aggregates, enhance aggregate stability, as well as increase SOC concentration in bulk soils and all soil aggregate sizes. Soil organic carbon (SOC) plays a key role in forming and stabilizing soil structure, enhancing soil physical properties, and nutrient recycling 1-3. Soil aggregate, the basic unit of soil structure, mediates many physical and chemical processes in soils 4-8 , such as soil compaction, soil nutrient recycling, soil erosion, root penetration, and crop yield 9. Aggregate stability is frequently used as an indicator of soil structure 10-12 because better soil structure and higher aggregate stability are vital to improve soil fertility, soil sustainability, and productivity 13,14. SOC influenced aggregate stability and soil structure 15,16. The stability of organic carbon in different size aggregates is different. Organic carbon in the micro-aggregates is less susceptible to change than it is in the macro-aggregates 17. The soil organic matters of different cropping systems differed based on the quantity and quality of the crop residue coverage and the environment, affecting the organic carbon contents of the soil and the aggregate stability 18. The cropping systems mainly create conditions for the decomposition and transformation of soil organic matter by changing the distribution of soil organic carbon and the active habitat of microorganisms, thereby causing changes in soil aggregates 19. Soil mean weight diameter (MWD), geometric mean diameter (GMD), fractal dimension (D), percentage of aggregates destruction (PAD) and water-stable aggregates stability rate (WSAR) are all indicators of soil aggregate stability. The larger the MWD and GMD values are, the higher the average particle size agglomeration of soil aggregates are, and the stronger the stability of soil structure is 20. Castrignano and Stelluti 21 found that ...

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Aggregate stability of four soils as evaluated by different indices

Cited by 6 publications

References 23 publications

Aggregate stability and carbon and N dymamics in macroaggregate size fractions with different soil texture

Aggregate stability and carbon and N dymamics in macroaggregate size fractions with different soil texture

Dynamics of Organic Carbon Fractions, Soil Fertility, and Aggregates Affected by Diverse Land-Use Cultivation Systems in Semiarid Degraded Land

Soil aggregates stability and storage of soil organic carbon respond to cropping systems on Black Soils of Northeast China

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