Soil texture effects on multifractal behaviour of nitrogen adsorption and desorption isotherms

Paz‐Ferreiro, Jorge; Marinho, Mara de Andrade; Abreu, Cleide Aparecida de; Vidal-Vázquez, Eva

doi:10.1016/j.biosystemseng.2018.01.009

Cited by 18 publications

(9 citation statements)

References 23 publications

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“…Although nitrogen in soil is highly soluble, the amount of nitrogen leaching in the soils in this experiment was not particularly high, and nearly 50% of nitrogen remained in the soil. The results were similar to Chen's study on nitrogen transport in black soil in this area 31 , and this similarity may reflect the low amount of residual nitrogen in the soil column after pre-leaching and the strong adsorption capacity of soil colloids for nitrogen 32 .…”

Section: Resultssupporting

confidence: 87%

Effects of different agronomic practices on the selective soil properties and nitrogen leaching of black soil in Northeast China

Wang

Gao

Xie

et al. 2020

Sci Rep

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Considering the large amount and high frequency application of concentrated fertilizer nitrogen in the Black Soil Region of Northeast China, the current laboratory/field simulation study aimed to explore the pollution risk of added nitrogen in black soil to groundwater and identify effective measures to prevent and control soil nitrogen leaching with an undisturbed soil column. The results showed that the saturated nitrogen adsorption capacities increased by 1.7%, 7.7% and 18.5% in ploughing, impervious agent (starch grafted polyacrylic acid) addition, and corn straw returning treatments, respectively, relative to the control (no-till). When the collection volume of the leaching solution reached the experimental maximum (4,000 mL), the total amount of nitrogen leaching from the control soil column (i.e., the no-tillage treatment) accounted for more than 50% of the added nitrogen, indicating a great risk of nitrogen pollution in groundwater. Compared with the no-tillage treatment, the amount of nitrogen leaching from the ploughing treatment increased insignificantly, and the amount of nitrogen leaching in the following spring in the corn straw returning treatment increased by 11.2%. The amount of nitrogen leaching decreased by 12.5% in the soil sampled in autumn of the second year. The total amount of nitrogen leaching in the soil with impervious agents decreased by 40.1%. Therefore, the permeability-reducing agent could significantly reduce underground water pollution risk posed by nitrogen leaching.

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Section: Resultssupporting

confidence: 87%

Effects of different agronomic practices on the selective soil properties and nitrogen leaching of black soil in Northeast China

Wang

Gao

Xie

et al. 2020

Sci Rep

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“…The amplitude and asymmetry of the singularity spectrum are indicative of heterogeneity in the database (Paz-Ferreiro et al 2018),…”

Section: Milletmentioning

confidence: 99%

Multifractal analysis of soil fauna diversity indexes

Silva

Siqueira

2020

Bragantia

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The objective of this study was to determine the multifractality of diversity indexes of edaphic fauna in areas with natural vegetation and in agricultural systems. Biological sampling was carried out in seven treatments (millet, maize, soybean, eucalyptus, preserved cerrado, disturbed cerrado and pasture), containing 130 pitfall traps, distributed in transects with 3 m of spacing between sampling points, totaling 390 m. The multifractal analysis was determined based on the moment method, where estimates such as the capacity dimensions, entropy and the correlation of the diversity indexes were calculated. The soybean area had greater Shannon diversity (2.69), however it had smaller abundance of individuals. The partition functions were adjusted with coefficient of determination > 0.90. The difference between D-10-D 10 , ranged from 0.080 to 1,707 for Pielou equitability in soybean cultivation, for richness in the area under the cultivation of eucalyptus. The singularity spectra expressed graphs with different degrees of heterogeneity for the soil fauna indexes, and the richness expressed the best structure. The area cultivated with soybean had a monofractal tendency, due to the homogeneous distribution of individuals of the edaphic fauna along the transect. The fractal analysis provided the description of patterns of variability that are not detected by classical methods.

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“…The singularity spectra had a parabola shape with variation in the skewness of the branches. According to ), Paz-Ferreiro et al (2018 and Siqueira et al (2018), the skewness of spectra indicates the dominance of outliers in the data. High coefficients of variation were observed in the present study (Table 1).…”

Section: Dmentioning

confidence: 99%

“…For the values of α min , the lowest values were observed in profiles 10 (α mim = 0.844, type A), 16 (α mim = 0.818, type B), 27 (α mim = 0.874, type C) and 28 (α mim = 0.928, type D). Variations in the width (α min ) and range (α max ) of singularity spectra indicate heterogeneity (Table 2), as these parameters provide information on the variability in the measured scales (Vidal-Vázquez et al, 2010Wilson et al, 2016;Paz-Ferreiro et al, 2018). Width of the f(α)-α spectrum is positively correlated with heterogeneity in the local scaling indices (Siqueira et al, 2018).…”

Section: Dmentioning

confidence: 99%

Multifractal analysis of soil penetration resistance under sugarcane cultivation

Leiva

Silva

Buss

et al. 2019

Rev. bras. eng. agríc. ambient.

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Soil resistance to penetration (PR) is an indirect measure of the state of soil compaction. Thus, the objective of this study was to characterize PR in vertical profiles in an area cultivated with sugarcane using multifractal models for different relief units. The experiment was carried out in an Oxisol with a clay texture, with 6.85 ha in the municipality of Coelho Neto (Maranhão state, Brazil), where 60 sampling points were demarcated. The area was divided into four relief units (Type A > 74 m, Type B from 71 to 74 m, Type C from 68 to 71 m and Type D from 65 to 68 m). The PR was measured at the 60 sampling points using an impact penetrometer, and the PR determined in the 0-0.60 m depth layer every 0.01 m. The multifractal analysis was performed considering the scale property of each profile and typified the singularity and Rènyi spectra estimated using the current method. Multifractal analysis allowed the identification of patterns at different scales and with high heterogeneity. The multifractal behavior was represented by the singularity spectrum (α), versus f(α), and the generalized dimension (Dq). The multifractal analysis allowed the differentiation between the profiles of the relief units (Types A, B, C and D), resulting in an important tool for studies of soil resistance to penetration.

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Soil texture effects on multifractal behaviour of nitrogen adsorption and desorption isotherms

Cited by 18 publications

References 23 publications

Effects of different agronomic practices on the selective soil properties and nitrogen leaching of black soil in Northeast China

Effects of different agronomic practices on the selective soil properties and nitrogen leaching of black soil in Northeast China

Multifractal analysis of soil fauna diversity indexes

Multifractal analysis of soil penetration resistance under sugarcane cultivation

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