Relationships of priming effects with organic amendment composition and soil microbial properties

Kok, D.D.; Scherer, Laura; Vries, Wim de; Trimbos, Krijn B.; Bodegom, Peter M. van

doi:10.1016/j.geoderma.2022.115951

Cited by 16 publications

(4 citation statements)

References 74 publications

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“…Since no single OA quality indicator performed best at both sites for any soil hydro‐physical property, the impact of OA composition likely also depends on the conditions of the local soil environment. A complex interaction effect with the soil biotic and abiotic properties prior to OA application can often explain subsequent changes in the soil (Chen et al., 2022; Hamer & Marschner, 2005; Kok et al., 2022; Lloyd et al., 2016). Potentially, OA quality may have a more consistent impact on soil improvements in agricultural settings where the total nutrient inputs are not supplemented with mineral fertilizers and are, instead, completely dependent on the nutrients provided by the OAs applied.…”

Section: Discussionmentioning

confidence: 99%

Temporal variability in organic amendment impacts on hydro‐physical properties of sandy agricultural soils

Kok

Scherer

Vries

et al. 2023

Soil Science Soc of Amer J

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Organic amendments (OAs) can improve the hydro-physical properties of a soil and thereby potentially enhance the resilience of agricultural systems to droughts and floods. An OA's contribution to this resilience, however, depends on the timeliness of its impacts, as soil improvements should be achieved when droughts are most frequent or flood risks are greatest. Yet little is known regarding the temporal variability of OA impacts or the influence of OA quantity and quality thereupon. In this research, therefore, we investigated at two agricultural sites the temporal variability of improvements in soil bulk density, aggregate stability, infiltration capacity and water retention after the application of compost, farmyard manure, bokashi, a selection of organic residues from landscape maintenance, and a combination of these residues with manure. Results showed that, depending on management practices and soil type, OAs decrease bulk density by up to 9.8%, increase infiltration capacity by up to 108.1%, aggregate stability by up to 60.0%, and water retention by up to 77.8% relative to unamended controls within 3 years of repeated application. However, the magnitude of these improvements varies up to 96% between seasons, depending on the soil property and OA treatment. On average, for all treatments, impacts relative to the control varied between different seasons by 5% for bulk density, 47.1% for infiltration capacity, 22.6% for aggregate stability, and 26.3% for water retention. When offsetting OA nutrient differences with mineral fertilizers, this variability showed a stronger correlation to differences in OA application quantity than quality (i.e., chemical composition). Results suggest that disregarding temporal variability in OA impacts can result in an inaccurate valuation of OAs as either effective or ineffective in improving soil resilience, given that impacts may, instead of their frequently presumed persistency, actually be highly transient or lagged. Our findings highlight the importance of considering the potential intra-annual variability of OA impacts on soil hydro-physical properties when designing OA application strategies to ameliorate the effects of specific seasonal climatic challenges.

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Section: Discussionmentioning

confidence: 99%

Temporal variability in organic amendment impacts on hydro‐physical properties of sandy agricultural soils

Kok

Scherer

Vries

et al. 2023

Soil Science Soc of Amer J

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“…In order to detect the quantity and quality of DNA, we used a NanoDrop2000 (Thermo Scientific, Wilmington, NC, USA) and 1% agarose gel electrophoresis, respectively. The sequences of the prokaryotic 16 small subunit (16S) rRNA V3-V4 hypervariable region with the primer set 338F/806R (338F, 5 -ACT CCT ACG GGA GGC AGC AG-3 and 806R, 5 -GGA CTA CHV GGG TWT CTA AT-3 ) [5] and the fungal internal transcribed spacer 1 region (ITS1R) with the primer set ITS1F/ITS2R (ITS1F, 5 -CTT GGT CAT TTAGAG GAA GTA A-3 , ITS2R, 5 -GCT GCG TTC TTC ATC GAT GC-3 ) [5] were amplified via polymerase chain reaction (PCR). The PCR program used the following steps: 3 min at 95 • C for initial denaturation, followed by 27 cycles of 30 s at 95 • C for denaturing; annealing at 55 O.…”

Section: High-throughput Sequencingmentioning

confidence: 99%

“…Soil organic carbon (SOC) is necessary for ecosystem processes and is critical for C cycling in farmlands [1,2]. The return of crop residues can offset SOC and nutrient loss, and it is critical for maintaining crop productivity and quality [3][4][5]. However, the input of crop residues on arable lands was reported to either increase or decrease SOC mineralization, which is known as the priming effect (PE) [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Microbial Mechanisms of the Priming Effect over 12 Years of Different Amounts of Nitrogen Management

et al. 2023

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The return of crop residues and application of chemical nitrogen (N) can influence the soil organic carbon (SOC) turnover. However, the changes in the response of the priming effect (PE) to N management in real farming systems are not fully understood. In this research, we launched a 270-day in situ experiment in three N management plots (N0, no N; N1, 300 kg hm−2; and N2, 360 kg hm−2) on a long-term maize farm in order to examine the microbial mechanisms that trigger the PE in the presence of 13C-labeled maize residues. We found that N1 decreased SOC mineralization and the positive PE, but increased the residual C mineralization and microbial C use efficiency in comparison with N0 and N2, respectively. The positive PE can be explained by the microbial nutrient mining theory for N0 and by the microbial stoichiometry decomposition theory for N1 and N2, as reflected by the increased abundance of oligotrophic phyla in N0 and the increased abundance of copiotrophic phyla in N1 and N2. The microbial biomass C (MBC), residue-derived MBC, and the communities’ complexity were decreased in N2 due to the acidification of the soil environment, but N1 enhanced the MBC, residue-derived MBC, and bacterial communities’ complexity. The keystone bacterial taxa of Vicinamibacteraceae and Gemmatimonas preferred the recalcitrant C of SOC in N0 and N2, respectively. However, Acidibacter favored the labile residual C in N1. The keystone fungal taxa of Penicillium, Sarocladium, and Cladophialophora exhibited wide substrate-use abilities in N0, N1, and N2, respectively. Our research depicts the mechanisms of how microbial communities’ structures are reshaped through N management and emphasizes the functions of the keystone microbial taxa in C turnover and the PE in farming systems.

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“…These have been shown to increase soil C content along with water and nutrient availability [ 8 , 9 ]. Despite their potential benefits, organic soil amendments may also induce undesirable effects such as increasing carbon dioxide (CO 2 ) emissions, which can be produced as part of the decomposition of the organic amendments themselves [ 10 ] or as a consequence of increased decomposition of native SOC, a mechanism also known as positive priming [ 11 – 13 ]. Another potential source of greenhouse gas (GHG) emissions is denitrification [ 14 , 15 ], which can increase nitrous oxide (N 2 O) emissions in response to nutrients and wet soil conditions [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Ligneous amendments increase soil organic carbon content in fine-textured boreal soils and modulate N2O emissions

et al. 2023

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Organic soil amendments are used to improve soil quality and mitigate climate change. However, their effects on soil structure, nutrient and water retention as well as greenhouse gas (GHG) emissions are still poorly understood. The purpose of this study was to determine the residual effects of a single field application of four ligneous soil amendments on soil structure and GHG emissions. We conducted a laboratory incubation experiment using soil samples collected from an ongoing soil-amendment field experiment at Qvidja Farm in south-west Finland, two years after a single application of four ligneous biomasses. Specifically, two biochars (willow and spruce) produced via slow pyrolysis, and two mixed pulp sludges from paper industry side-streams were applied at a rate of 9–22 Mg ha-1 mixed in the top 0.1 m soil layer. An unamended fertilized soil was used as a control. The laboratory incubation lasted for 33 days, during which the samples were kept at room temperature (21°C) and at 20%, 40%, 70% or 100% water holding capacity. Carbon dioxide (CO2), nitrous oxide (N2O) and methane (CH4) fluxes were measured periodically after 1, 5, 12, 20 and 33 days of incubation. The application of ligneous soil amendments increased the pH of the sampled soils by 0.4–0.8 units, whereas the effects on soil organic carbon content and soil structure varied between treatments. The GHG exchange was dominated by CO2 emissions, which were mainly unaffected by the soil amendment treatments. The contribution of soil CH4 exchange was negligible (nearly no emissions) compared to soil CO2 and N2O emissions. The soil N2O emissions exhibited a positive exponential relationship with soil moisture. Overall, the soil amendments reduced N2O emissions on average by 13%, 64%, 28%, and 37%, at the four soil moisture levels, respectively. Furthermore, the variation in N2O emissions between the amendments correlated positively with their liming effect. More specifically, the potential for the pulp sludge treatments to modulate N2O emissions was evident only in response to high water contents. This tendency to modulate N2O emissions was attributed to their capacity to increase soil pH and influence soil processes by persisting in the soil long after their application.

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Relationships of priming effects with organic amendment composition and soil microbial properties

Cited by 16 publications

References 74 publications

Temporal variability in organic amendment impacts on hydro‐physical properties of sandy agricultural soils

Temporal variability in organic amendment impacts on hydro‐physical properties of sandy agricultural soils

Microbial Mechanisms of the Priming Effect over 12 Years of Different Amounts of Nitrogen Management

Ligneous amendments increase soil organic carbon content in fine-textured boreal soils and modulate N2O emissions

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