Soil organic matter in major pedogenic soil groups

Kögel‐Knabner, Ingrid; Amelung, Wulf

doi:10.1016/j.geoderma.2020.114785

Cited by 97 publications

(45 citation statements)

References 275 publications

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“…Acidification is one of the most serious problems associated with agricultural production in Ultisol, limiting the availability of nutrients, and increasing nutrients and SOC losses 17 . As a result, Aridisol and Ultisol have lower organic C content and fertility than Mollisol 24 . In C-poor soils, straw input will be preferentially digested by microorganisms to supplement organic C in larger aggregate 25 .…”

Section: Discussionmentioning

confidence: 99%

Distributions of straw-derived carbon in Mollisol’s aggregates under different fertilization practices

Bol

et al. 2021

Sci Rep

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Straw incorporation is an effective measure for increasing soil organic carbon (SOC) thereby improving soil quality and crop productivity. However, quantitative assessments of the transformation and distribution of exogenous carbon (C) in soil aggregates under various field fertilization practices have been lacking. In this study, we collected topsoil samples (0–20 cm) from three fertilization treatments (no fertilization control, CK; inorganic fertilizer, IF; inorganic fertilizer plus manure, IFM) at a 29-year long-term Mollisol experiment in Northeast China. We then mixed the soil samples with 13C-labeled maize straw (δ13C = 246.9‰), referred as CKS, IFS, and IFMS, and incubated them in-situ for 360 days. Initial and incubated soil samples were separated into four aggregate fractions (> 2, 1–2, 0.25–1, and < 0.25 mm) using the dry-sieving method, which counted 18%, 17%, 45%, and 21% (averages from the three initial soil samples), respectively. Organic C content was highest in 0.25–1 mm aggregate (6.9–9.6 g kg−1) prior to incubation, followed by > 2 mm aggregates (2.2–5.8 g kg−1), 1–2 mm aggregates (2.4–4.6 g kg−1), and < 0.25 mm aggregates (3.3–4.5 g kg−1). After 360-day incubation with straw incorporation, organic C content was 2.3–4.5 g kg−1, 2.9–5.0 g kg−1, 7.2–11 g kg−1 and 1.8–3.0 g kg−1 in > 2, 1–2, 0.25–1, and < 0.25 mm aggregates, respectively, with the highest in the IFMS treatment. Straw-derived C content was 0.02–0.05 g kg−1, 0.03–0.04 g kg−1, 0.11–0.13 g kg−1, and 0.05–0.10 g kg−1 in > 2, 1–2, 0.25–1, and < 0.25 mm aggregates, respectively. The relative distribution of straw-derived C was highest (40–49%) in 0.25–1 mm aggregate, followed by < 0.25 mm aggregates (21–31%), 1–2 mm aggregates (13–15%), and > 2 mm aggregates (9.4–16%). During the incubation, the relative distribution of straw-derived C exhibited a decrease in > 2 mm and 1–2 mm aggregates, but an increase in the < 0.25 mm aggregate. At the end of incubation, the relative distribution of straw-derived C showed a decrease in the 0.25–1 mm aggregate but an increase in the < 0.25 mm aggregate under the IFMS treatment. This study indicates that more straw-derived C would be accumulated in smaller aggregates over longer period in Mollisols, and combined inorganic and organic fertilization is an effective measure for C sequestration in Northeast China.

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Section: Discussionmentioning

confidence: 99%

Distributions of straw-derived carbon in Mollisol’s aggregates under different fertilization practices

Bol

et al. 2021

Sci Rep

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“…We conclude that fractionation of SOM detected in Podzol subsoil horizons is at least affected by these adsorptive processes. However, further processes are involved in SOM storage in Podzol subsoil horizons, including micro-aggregate formation and preferential accumulation of carbohydrates, as recently reviewed 51 .…”

Section: Discussionmentioning

confidence: 99%

Mobilisation of Al, Fe, and DOM from topsoil during simulated early Podzol development and subsequent DOM adsorption on model minerals

Krettek

Rennert

2021

Sci Rep

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Podzols are characterised by mobilisation of metals, particularly Al and Fe, and dissolved organic matter (DOM) in topsoil horizons, and by immobilisation in subsoil horizons. We mimicked element mobilisation during early podzolisation by irrigating the AE horizon of a Dystric Arenosol with acetic acid at different flow velocities and applying flow interruptions to study rate-limited release in experiments with soil cylinders. We used eluates in batch experiments with goethite and Al-saturated montmorillonite to investigate DOM reactivity towards minerals. Both the flow velocity and flow interruptions affected element release, pointing to chemical non-equilibrium of release and to particles, containing Fe and OM mobilised at larger flow velocity, characteristic of heavy rain or snowmelt. Based on chemical extractions, the source of mobilised Al and Fe, the vast majority of which was complexed by DOM, was no oxide phase, but rather organic. Rate limitation also affected the composition of DOM released. Carboxyl and phenolic species were the most important species adsorbed by both minerals. However, DOM composition affected the extent of DOM adsorption on goethite more distinctly than that on montmorillonite. Our findings evidence that the intensity of soil percolation affects quantitative and qualitative element release during early podzolisation and adsorptive DOM retention in subsoil horizons.

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“…During this period, Lithuania has the highest precipitation levels and relatively high air temperature. These conditions provide a possibility for the transport of nutrients from the upper soil layers to the lower layer of soil where optimal conditions for microbial activities are reached [31,32]. The findings of the study of Francioli et al [33] provided the basis for research related to the result of an amendment on the soil microorganism population actions, effects, and structure.…”

Section: Soil Microbiota Activity In Differently Formed Agroecosystemsmentioning

confidence: 98%

Biological Indicators of Soil Quality under Different Tillage Systems in Retisol

Vilkiene¹,

Mockeviciene²,

Karčauskienė³

et al. 2021

Sustainability

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Soil microorganism diversity has a close relation with soil function, and the changes in the composition of the soil microbial population can directly affect it. The aim of this study was to identify the bacterial community composition and determine the main soil chemical and physical properties formed by the different tillage systems. In the experiment, we analyzed the combination of three tillage systems and four organic fertilizers. Soil samples were taken from the two layers of the soil profile: the upper 0–10 cm and the lower 10–20 cm. The composition and diversity of soil bacterial communities were assessed by the sequencing of 16S rRNA genes. Results revealed that the highest biodiversity was found in the soil with shallow ploughless tillage and enriched with farmyard manure. Actinobacteria and Proteobacteria were the dominant bacterial species across all treatments. Their total abundance varied between 26% and 36% in the different analyzed agroecosystems. For the Dystric Bathygleyic Glossic Retisol, shallow ploughless tillage is the most suitable tillage system, as it creates favorable conditions for the accumulation of organic carbon in the soil under the Western Lithuania climate conditions.

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Soil organic matter in major pedogenic soil groups

Cited by 97 publications

References 275 publications

Distributions of straw-derived carbon in Mollisol’s aggregates under different fertilization practices

Distributions of straw-derived carbon in Mollisol’s aggregates under different fertilization practices

Mobilisation of Al, Fe, and DOM from topsoil during simulated early Podzol development and subsequent DOM adsorption on model minerals

Biological Indicators of Soil Quality under Different Tillage Systems in Retisol

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