Organo-Mineral Interactions Are More Important for Organic Matter Retention in Subsoil Than Topsoil

Poirier, Vincent; Basile‐Doelsch, Isabelle; Balesdent, Jérôme; Borschneck, Daniel; Whalen, Joann K.; Angers, Denis A.

doi:10.3390/soilsystems4010004

Cited by 25 publications

(14 citation statements)

References 45 publications

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“…MAOM formation from POM can be fast: minerals quickly stabilize POM-derived N, as demonstrated by the rapid transfer of 15 N-labelled residues into MAOM fractions (Kölbl et al 2006 ; Bosshard et al 2008 ; Poirier et al 2020 ; T.M. Bowles, unpublished data).…”

Section: Model Detailsmentioning

confidence: 99%

A holistic framework integrating plant-microbe-mineral regulation of soil bioavailable nitrogen

et al. 2021

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Soil organic nitrogen (N) is a critical resource for plants and microbes, but the processes that govern its cycle are not well-described. To promote a holistic understanding of soil N dynamics, we need an integrated model that links soil organic matter (SOM) cycling to bioavailable N in both unmanaged and managed landscapes, including agroecosystems. We present a framework that unifies recent conceptual advances in our understanding of three critical steps in bioavailable N cycling: organic N (ON) depolymerization and solubilization; bioavailable N sorption and desorption on mineral surfaces; and microbial ON turnover including assimilation, mineralization, and the recycling of microbial products. Consideration of the balance between these processes provides insight into the sources, sinks, and flux rates of bioavailable N. By accounting for interactions among the biological, physical, and chemical controls over ON and its availability to plants and microbes, our conceptual model unifies complex mechanisms of ON transformation in a concrete conceptual framework that is amenable to experimental testing and translates into ideas for new management practices. This framework will allow researchers and practitioners to use common measurements of particulate organic matter (POM) and mineral-associated organic matter (MAOM) to design strategic organic N-cycle interventions that optimize ecosystem productivity and minimize environmental N loss.

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Section: Model Detailsmentioning

confidence: 99%

A holistic framework integrating plant-microbe-mineral regulation of soil bioavailable nitrogen

et al. 2021

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“…These processes led to the formation of horizons with maximum thickness and the highest content of organic carbon in the accumulative ecotype with optimal moisture conditions and physical parameters of the substrate. Differences between surface and sub-surface horizons decreased with growing time, which is associated with more intense incorporation of organic matter into the soil profile (Poirier et al 2020). With the increasing accumulation of organic matter, carbonate acidification and leaching occurred relatively quickly, in particular in the top layer of the Kuzbass soil horizons.…”

Section: Discussionmentioning

confidence: 93%

Successive processes at quarry waste dumps of various ages

Smirnov

Mutalibova

Leontyev

et al. 2021

Folia Forestalia Polonica

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This work is dedicated to the study of the succession processes in quarries of different ages in the territory of the Russian Federation and neighbouring countries, namely, Kazakhstan and Ukraine. In selected soil samples from the areas studied, certain physical and chemical properties, the quantitative composition of microbial communities and the diversity of floral species from the quarries were studied. The pH values for the Kuzbass area were found to decrease to 4.8, and in the area of the younger quarries – Inguletsky and Sokolovsky – higher pH values were recorded. The basal soil respiration rate of the Kuzbass quarry was approximately 0.2 mg CO2/g/h. The CO2 carbonate content ranged from 0.05% to 0.6%. The microbial biomass in Kuzbass soil was from 0.87 to 5.10 μg C/g soil, while its quantity in other quarries was 6 times lower, which is associated with the relatively young age of these sites. The study of the diversity of floral species in the Kuznetsk coalfield identified 120 species of upper plants belonging to 34 families. Among them, cereals, legumes and mosses, lichens and algae were predominant. In the territory of Inguletsky and Sokolovsky quarries, the diversity of plant species was much poorer. In this regard, further research will focus on increasing the rate of succession and maintaining ecosystem stability by increasing the share of microorganisms. Also, the study of the possibility to accelerate the restoration of younger flora in the discharges of age careers at the expense of the mycorrhizal communities formation is of high relevance.

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“…The formation and size of aggregates depend on surface charge and area of the aggregate-forming materials (e.g., Tombácz and Szekeres 2006). Since chlorite minerals have higher surface charges than mica minerals, chlorite is expected to be the predominant clay mineral in the organo-mineral or mineral-mineral aggregates (Poirier et al 2020), followed by mica. Interestingly, this was noticeable based on chlorite and mica contents in the different size fractions.…”

Section: More Insights Into Ecosystem Development Through Size-fractionated Sediments and Correlationsmentioning

confidence: 99%

Tracking mineral and geochemical characteristics of Holocene lake sediments: the case of Hotagen, west-central Sweden

Kanbar

Olajos

et al. 2021

J Soils Sediments

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Purpose Intact lake sediments reflect the development of terrestrial ecosystems. This development can be understood by decoding mineral and geochemical information of sedimentary archives. Therefore, we characterized a Holocene lake sediment core and revealed bulk to micro-scale variations via a combination of geochemical techniques and statistical methods. Methods A 2.3 m sediment core was collected from Hotagen, a lake in west-central Sweden; a sediment sample was collected every 5 cm. A part of each sediment sample was kept untreated (named bulk) and another part was size-fractionated into < 4, 4–16, 16–64, and > 64 µm subsamples. Characterization was then made with respect to grain size distribution (GSD), physico-chemical parameters, geochemical properties, organic composition, and mineralogy. The sediments were investigated at bulk, micro-, and elemental scales using powder X-ray diffraction (XRD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), and scanning electron microscopy coupled to energy-dispersive X-ray spectroscopy (SEM–EDX). Results The deepest sediment was identified as glacial till dating back to the Late Pleistocene. The bulk sediments showed a clear distinction between 0–195 cm (unit 1, U1) and 200–225 cm (unit 2, U2) depths. Quartz and feldspar minerals decreased and organic matter and clay minerals increased from the till towards the lower limit of U1. The development in the sedimentary properties marked the transformation of the terrestrial ecosystem from glacier-covered land to vegetated areas. This development was also well reflected by the appearance of X-ray amorphous materials and the formation of distinct organo-mineral aggregates; chlorite was the predominant clay mineral in these aggregates. The geochemical variation between U2 and U1 sediments was further established by resolving the DRIFT spectral components through multivariate curve resolution alternating least square (MCR-ALS). The U1 sediments settled over a period of ~ 7500 years and showed comparable mineral, geochemical, and organic composition. However, the size-fractionated sediments, mainly < 4 µm, showed diverse mineral and geochemical composition. Indeed, these sediments were distinct by containing relatively higher amounts of X-ray amorphous materials and clay minerals, the latter had variable Na, Mg, and K contents. Conclusion The combined use of geochemical and statistical approaches used in this study followed the mineral and geochemical development of sediments that had settled during the Late Pleistocene and Early Holocene Epochs. Finally, the U2 sediments marked the terrestrial ecosystem development that occurred during the late glaciation, deglaciation, and post-glaciation periods. Graphical abstract

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Organo-Mineral Interactions Are More Important for Organic Matter Retention in Subsoil Than Topsoil

Cited by 25 publications

References 45 publications

A holistic framework integrating plant-microbe-mineral regulation of soil bioavailable nitrogen

A holistic framework integrating plant-microbe-mineral regulation of soil bioavailable nitrogen

Successive processes at quarry waste dumps of various ages

Tracking mineral and geochemical characteristics of Holocene lake sediments: the case of Hotagen, west-central Sweden

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