Rhizosphere geometry and heterogeneity arising from root‐mediated physical and chemical processes
- 15 August 2005
- journal article
- review article
- Published by Wiley in New Phytologist
- Vol. 168 (2), 293-303
- https://doi.org/10.1111/j.1469-8137.2005.01512.x
Abstract
The rhizosphere differs from the bulk soil in a range of biochemical, chemical and physical processes that occur as a consequence of root growth, water and nutrient uptake, respiration and rhizodeposition. These processes also affect microbial ecology and plant physiology to a considerable extent. This review concentrates on two features of this unique environment: rhizosphere geometry and heterogeneity in both space and time. Although it is often depicted as a soil cylinder of a given radius around the root, drawing a boundary between the rhizosphere and bulk soil is an impossible task because rhizosphere processes result in gradients of different sizes. For instance, because of diffusional constraints, root uptake can result in a depletion zone extending < 1 mm for phosphate to several centimetres for nitrate, while respiration may affect the bulk of the soil. Rhizosphere processes are responsible for spatial and temporal heterogeneities in the soil, although these are sometimes difficult to distinguish from intrinsic soil heterogeneity. A further complexity is that these processes are regulated by plants, microbial communities and soil constituents, and their many interactions. 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.Keywords
This publication has 69 references indexed in Scilit:
- Plant and mycorrhizal regulation of rhizodepositionNew Phytologist, 2004
- Combined use of different Gfp reporters for monitoring single-cell activities of a genetically modified PCB degrader in the rhizosphere of alfalfaFEMS Microbiology Ecology, 2004
- The plastic plant: root responses to heterogeneous supplies of nutrientsNew Phytologist, 2004
- Rhizosphere Characteristics of the Arsenic Hyperaccumulator Pteris vittata L. and Monitoring of Phytoremoval EfficiencyEnvironmental Science & Technology, 2003
- Flux of protons released by wild type and ferritin over-expressor tobacco plants : effect of phosphorus and iron nutritionPlant Physiology and Biochemistry, 2003
- Cluster roots – an underground adaptation for survival in extreme environmentsTrends in Plant Science, 2002
- Root‐ and microbial‐derived mucilages affect soil structure and water transportEuropean Journal of Soil Science, 2000
- Surface tension and viscosity of axenic maize and lupin root mucilagesNew Phytologist, 1997
- Root‐induced irreversible transformation of a trioctahedral mica in the rhizosphere of rapeEuropean Journal of Soil Science, 1993
- Phosphate diffusion in soil and uptake by plantsPlant and Soil, 1967