Soil structure and microbial activity dynamics in 20‐month field‐incubated organic‐amended soils

Arthur, Emmanuel; Schjønning, Per; Møldrup, Per; Razzaghi, Fatemeh; Tuller, Markus; Jonge, Lis Wollesen de

doi:10.1111/ejss.12121

Cited by 17 publications

(8 citation statements)

References 41 publications

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“…For instance, the increase in surface area and the attendant enhancement of available binding sites, the improved aggregation and concomitant decrease in tensile strength and changes in pore configuration (modification of the proportions of wide-coarse, narrow-coarse, medium and fine pores) in amended soils are direct consequences of microstructural changes in the amended soil (Ajayi et al, 2016;Arthur et al, 2014;Yoo et al, 2014). However, this particle to particle scale changes have not been well elaborated in several studies that aimed to analyse the consequence of soil amendments.…”

Section: Introductionmentioning

confidence: 99%

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Ajayi¹,

Horn²

2016

International Agrophysics

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A b s t r a c t. Changing climate is threatening rainfall regularity particularly in the semi-arid and arid regions; therefore, strategies to conserve water within their coarse-grained soils and to improve water use efficiency of crops are critical. This study compared the effectiveness of biochar and two types of clay materials in augmenting water retention and improving mechanical resilience of fine sand. The amendment of fine sand with woodchip-biochar and kaolinite (non-swelling clay) and Na-bentonite (swelling clay) improved the water retention capacity and interparticle bonding of the substrate depending of the rate of amendment and water content of the substrates. Na-bentonite was more effective at increasing water retention capacity at more negative matric potentials. Biochar was more effective at saturation due to the increased porosity, while kaolinite responds similarly to biochar. It is, however, shown that most of the water retained by the Na-betonite may not be available to plants, particularly at high amendment rate. Furthermore, the clay and biochar materials improved particle bonding in the fine sand with the Na-bentonite being more effective than biochar and kaolinite (in that order) in strengthening interparticle bonds and improving the resilience of fine sand, if the rate of amendment is kept at ≤50 g kg -1 .

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Section: Introductionmentioning

confidence: 99%

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Ajayi¹,

Horn²

2016

International Agrophysics

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“…Soil organic carbon (SOC) stock is an important carbon pool in terrestrial ecosystems and a main source of greenhouse gas. Soil organic carbon is closely related to soil structure and fertility and is commonly used as a key indicator for assessing soil quality [ 1 , 2 ]. Therefore, quantitative evaluation of SOC levels is meaningful for sustainable soil utilization and management from estimating SOC stocks.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Mapping of Soil Organic Carbon by Combining Kriging Method with Profile Depth Function

Chen

et al. 2015

PLoS ONE

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Understanding spatial variation of soil organic carbon (SOC) in three-dimensional direction is helpful for land use management. Due to the effect of profile depths and soil texture on vertical distribution of SOC, the stationary assumption for SOC cannot be met in the vertical direction. Therefore the three-dimensional (3D) ordinary kriging technique cannot be directly used to map the distribution of SOC at a regional scale. The objectives of this study were to map the 3D distribution of SOC at a regional scale by combining kriging method with the profile depth function of SOC (KPDF), and to explore the effects of soil texture and land use type on vertical distribution of SOC in a fluvial plain. A total of 605 samples were collected from 121 soil profiles (0.0 to 1.0 m, 0.20 m increment) in Quzhou County, China and SOC contents were determined for each soil sample. The KPDF method was used to obtain the 3D map of SOC at the county scale. The results showed that the exponential equation well described the vertical distribution of mean values of the SOC contents. The coefficients of determination, root mean squared error and mean prediction error between the measured and the predicted SOC contents were 0.52, 1.82 and -0.24 g kg-1 respectively, suggesting that the KPDF method could be used to produce a 3D map of SOC content. The surface SOC contents were high in the mid-west and south regions, and low values lay in the southeast corner. The SOC contents showed significant positive correlations between the five different depths and the correlations of SOC contents were larger in adjacent layers than in non-adjacent layers. Soil texture and land use type had significant effects on the spatial distribution of SOC. The influence of land use type was more important than that of soil texture in the surface soil, and soil texture played a more important role in influencing the SOC levels for 0.2-0.4 m layer.

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“…Studies have shown that decomposed organic residues maintain and increase soil organic matter content (Iovieno et al, 2009;Tejada et al, 2009), which impacts physical properties important for soil functioning and plant growth. Physical impacts include improved soil structure by aggregation (Scotti et al, 2013;Arthur et al, 2014) that alters pore geometry and continuity so that water infiltration and root penetration through the soil profile increases (Zhu et al, 2016). There are also enhanced chemical characteristics through the release of plant nutrients (Swift, 2001;Leifeld et al, 2002), and stimulation and enhancement of the soil biotic community (Bekele et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Residues with varying decomposability interact differently with seed or root exudate compounds to affect the biophysical behaviour of soil

et al. 2019

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Plants have a large impact on the physical behaviour of soil, partly due to seed and root exudates that alter mineral:organic matter associations. In this study we explored how the decomposability of residues in soil interacts with seed or root exudate compounds to influence microbial respiration, mechanical behaviour and hydrological properties. Sandy loam and clay loam soils were amended at a rate of 40 t ha-1 with ground green barley (7.13 mg C g-1), barley straw (7.26 mg C g-1) or poultry manure (5.22 mg C g-1), and either chia seed exudate at 1.84 mg C g-1 soil or root exudate compounds at 14.4 mg C g-1 soil. On cores packed to 1.3 g cm-3 , uniaxial compression, penetration resistance, water sorptivity, water retention and porosity were measured at time 0, after 14 days of incubation at 20 o C, and then after subjecting incubated soils to three cycles of wetting and drying to simulate weathering. These time increments and weathering were intended to simulate a newly germinated seed or tip of a root, through to a more mature system. Application of seed and root exudate increased carbon dioxide (CO 2) emissions from 0.31 ± 0.01 to 15.11 ± 0.71 μg C-CO 2 g soil-1 hour-1 for the sandy loam soil and from 0.171 ± 0.01 to 10.56 ± 0.78 C-CO 2 g soil-1 hour-1 for the clay loam soil. There were large changes in soil physical properties caused by seed or root exudate amendment coupled with residues, their decomposition and weathering. After incubation and weathering, soils with added seed or root exudates and their interactions with organic residues were more mechanically stable, as measured by penetration resistance (22 to 58% increase) and compression index (25 to 43% decrease) compared to soils amended only with organic residue. Water sorptivity and porosity diminished with the addition of the exudate. Exudates in combination with organic residues better protected soils against structural destabilization by increasing particle cementation, and decreasing rapid wetting and porosity.

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Soil structure and microbial activity dynamics in 20‐month field‐incubated organic‐amended soils

Cited by 17 publications

References 41 publications

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Comparing the potentials of clay and biochar in improving water retention and mechanical resilience of sandy soil

Three-Dimensional Mapping of Soil Organic Carbon by Combining Kriging Method with Profile Depth Function

Residues with varying decomposability interact differently with seed or root exudate compounds to affect the biophysical behaviour of soil

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