Journal ArticleDOI
The capacity of soils to preserve organic C and N by their association with clay and silt particles
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TLDR
The finding of a given soil having a maximum capacity to preserve organic C and N will improve the estimations of the amounts of C andN that can become stabilized in soils.Abstract:
Although it has been recognized that the adsorption of organics to clay and silt particles is an important determinant of the stability of organic matter in soils, no attempts have been made to quantify the amounts of C and N that can be preserved in this way in different soils. Our hypothesis is that the amounts of C and N that can be associated with clay and silt particles is limited. This study quantifies the relationships between soil texture and the maximum amounts of C and N that can be preserved in the soil by their association with clay and silt particles. To estimate the maximum amounts of C and N that can be associated with clay and silt particles we compared the amounts of clay- and silt-associated C and N in Dutch grassland soils with corresponding Dutch arable soils. Secondly, we compared the amounts of clay- and silt-associated C and N in the Dutch soils with clay and silt-associated C and N in uncultivated soils of temperate and tropical regions. We observed that although the Dutch arable soils contained less C and N than the corresponding grassland soils, the amounts of C and N associated with clay and silt particles was the same indicating that the amounts of C and N that can become associated with this fraction had reached a maximum. We also observed close positive relationships between the proportion of primary particles 20 μm was not correlated with soil texture. Cultivation decreased the amount of C and N in the fraction > 20 μm to a greater extent than in the fraction < 20 μm, indicating that C and N associated with the fraction < 20 μm is better protected against decomposition. The finding of a given soil having a maximum capacity to preserve organic C and N will improve our estimations of the amounts of C and N that can become stabilized in soils. It has important consequences for the contribution of different soils to serve as a sink or source for C and N in the long term.read more
Citations
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Journal ArticleDOI
Stabilization mechanisms of soil organic matter: Implications for C-saturation of soils
TL;DR: The relationship between soil structure and the ability of soil to stabilize soil organic matter (SOM) is a key element in soil C dynamics that has either been overlooked or treated in a cursory fashion when developing SOM models as discussed by the authors.
Journal ArticleDOI
Stabilization of organic matter in temperate soils: mechanisms and their relevance under different soil conditions – a review
Margit von Lützow,Ingrid Kögel-Knabner,Klemens Ekschmitt,Egbert Matzner,Georg Guggenberger,Bernd Marschner,Heinz Flessa +6 more
TL;DR: In this article, a review of the mechanisms that are currently, but often contradictorily or inconsistently, considered to contribute to organic matter (OM) protection against decomposition in temperate soils is presented.
Journal ArticleDOI
Role of the soil matrix and minerals in protecting natural organic materials against biological attack
Jeff Baldock,Jan O. Skjemstad +1 more
TL;DR: In this paper, the authors consider the stabilisation of organic materials in soils by the soil matrix is a function of the chemical nature of the soil mineral fraction and the presence of multivalent cations.
Journal ArticleDOI
Water Pulses and Biogeochemical Cycles in Arid and Semiarid Ecosystems
Amy T. Austin,Laura Yahdjian,John M. Stark,Jayne Belnap,Amilcare Porporato,Urszula Norton,Damián A. Ravetta,Sean M. Schaeffer +7 more
TL;DR: The result of the interaction of texture and pulsed rainfall events suggests a corollary hypothesis for nutrient turnover in arid and semiarid ecosystems with a linear increase of N mineralization in coarse-textured soils, but a saturating response for fine- Textured soils due to the importance of soil C and N pools.
Journal ArticleDOI
Soil organic matter, biota and aggregation in temperate and tropical soils - Effects of no-tillage
Johan Six,Johan Six,Christian Feller,Karolien Denef,Stephen M. Ogle,João Carlos de Moraes Sá,Alain Albrecht +6 more
TL;DR: In this paper, the long-term stabilization of soil organic matter (SOM) in tropical and temperate regions is mediated by soil biota (e.g. fungi, bacte- ria, roots and earthworms), soil structure and their interactions.
References
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Book ChapterDOI
Physical Fractionation of Soil and Organic Matter in Primary Particle Size and Density Separates
TL;DR: The soil organic matter (SOM) pool encompasses plant, animal, and microbial residues in all stages of decay and a diversity of heterogeneous organic substances intimately associated with inorganic soil components.
Journal ArticleDOI
A rapid method for the determination of organic carbon in soil
TL;DR: In this article, the authors modified the traditional dry combustion method for the determination of organic carbon in soil to give results practically identical with those of the dry combustion methods, and the standard deviation of a single determination was only 12%.
Journal ArticleDOI
Soil Organic Matter Turnover in Long-term Field Experiments as Revealed by Carbon-13 Natural Abundance
Journal ArticleDOI
Soil structural aspects of decomposition of organic matter by micro-organisms
J.A. Van Veen,Peter Kuikman +1 more
TL;DR: In this paper, the relative importance of different mechanisms controlling decomposition in soil is derived from results of combined tracer and modelling studies. But, suitable methodology to quantify the relation between soil structure and biological processes as a function of different types and conditions of soils is still lacking.