Journal ArticleDOI
Compression of soil around roots
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In this article, a simplified model for soil compression around plant roots is developed, which assumes that the root volume is accommodated by loss of porosity in the surrounding soil, and that there is a minimum soil porosity below which soil will not be compressed; the density decreases exponentially with distance from the roots surface with an exponent which is a constant multiple of the root diameter.Abstract:
A simplified model is developed for soil compression around plant roots. The main assumptions are that the root volume is accommodated by loss of porosity in the surrounding soil; that there is a minimum soil porosity below which soil will not be compressed; and that the density decreases exponentially with distance from the roots surface with an exponent which is a constant multiple of the root diameter. These assumptions lead to simple, practical expressions for the soil porosity around roots and for the amounts of materials such as nutrients or organisms which lie within certain distances from a root surface.read more
Citations
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Journal ArticleDOI
Mycorrhizas and soil structure
TL;DR: It is argued that soil aggregation should be included in a more complete 'multifunctional' perspective of mycorrhizal ecology, and that in-depth understanding of myCorrhizas/soil process relationships will require analyses emphasizing feedbacks between soil structure and mycor Rhizas, rather than a uni-directional approach simply addressing mycorRhizal effects on soils.
Journal ArticleDOI
Rhizosphere: biophysics, biogeochemistry and ecological relevance
TL;DR: This review considers the unique biophysical and biogeochemical properties of the rhizosphere and draws some connections between them, and addresses the various mechanisms by which roots and associated microorganisms alter these major drivers of soil biogeochemistry.
Book ChapterDOI
Plant-induced changes in soil structure: Processes and feedbacks
Denis A. Angers,Jean Caron +1 more
TL;DR: In this paper, the role of plants in modifying soil structure is reviewed and a review of plant-induced changes in structure is presented. But, the authors do not consider the effect of plant growth on the root physical environment and water and nutrient cycles.
Journal ArticleDOI
Plant root growth, architecture and function
TL;DR: Some key biotic and abiotic constraints on root development and function in the soil environment are examined and some of the adaptations roots have evolved to counter such stresses discussed.
Journal ArticleDOI
Rhizosphere geometry and heterogeneity arising from root‐mediated physical and chemical processes
TL;DR: Novel in situ techniques and modelling will help in providing a holistic view of rhizosphere functioning, which is a prerequisite for its management and manipulation.
References
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Journal ArticleDOI
Expansion of Cavities in Infinite Soil Mass
TL;DR: In this article, a general solution is presented to the problem of the expansion of SPHERICAL and CYCLDRICAL CAVITIES in an InFINITE SOIL MASS, and it is shown that the principal PARAMETERS AFFECTING the ULTIMATE CAVITY PRESSURE are: the INITIAL GROUND STRESS, STRENGTH and VOLUME CHANGE CHARACTERISTICS of the Soil, and and the RIGIDity INDEX of the SOIL (DEFINED as the RATIO OF SHEAR MODUL
Journal ArticleDOI
Effect of Soil Texture on Critical Bulk Densities for Root Growth
TL;DR: In this article, the effects of soil texture on critical bulk densities for rooting at near-optimum soil water contents were analyzed and the results showed that soil texture can be used to estimate bulk density of fragipans and critical bulk density at which root growth is severely affected.
Journal ArticleDOI
Predicting root size and frequency from one-dimensional consolidation data — A mathematical model
M. J. M. Römkens,R. D. Miller +1 more
TL;DR: In this article, an implicit relationship between root size and soil reaction to root growth pressure is developed for a cohesionless soil from data of one-dimensional consolidation tests, based on a simplification of the observed dependency of void ratio on compression pressure, and the assumption of an inverse relationship over the domain of root influence between the radial stress and the distance from the axis of the root.