Reorganisation of rhizosphere soil pore structure by wild plant species in compacted soils

Author:

Burr-Hersey Jasmine E12ORCID,Ritz Karl1ORCID,Bengough Glyn A23ORCID,Mooney Sacha J1ORCID

Affiliation:

1. Division of Agricultural & Environmental Sciences, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK

2. The James Hutton Institute, Invergowrie, Dundee, UK

3. School of Science and Engineering, University of Dundee, Dundee, UK

Abstract

Abstract Soil compaction represents a major impediment to plant growth, yet wild plants are often observed thriving in soil of high bulk density in non-agricultural settings. We analysed the root growth of three non-cultivated species often found growing in compacted soils in the natural environment. Plants of ribwort plantain (Plantago lanceolata), dandelion (Taraxacum officinale), and spear thistle (Cirsium vulgare) were grown for 28 d in a sandy loam soil compacted to 1.8 g cm–3 with a penetration resistance of 1.55 MPa. X-Ray computed tomography was used to observe root architecture in situ and to visualise changes in rhizosphere porosity (at a resolution of 35 μm) at 14 d and 28 d after sowing. Porosity of the soil was analysed within four incremental zones up to 420 μm from the root surface. In all species, the porosity of the rhizosphere was greatest closest to the root and decreased with distance from the root surface. There were significant differences in rhizosphere porosity between the three species, with Cirsium plants exhibiting the greatest structural genesis across all rhizosphere zones. This creation of pore space indicates that plants can self-remediate compacted soil via localised structural reorganisation in the rhizosphere, which has potential functional implications for both plant and soil.

Funder

Soils Training And Research Studentships

Centre for Doctoral Training and Research Programme

British Geological Survey

Centre for Ecology and Hydrology

Cranfield University

James Hutton Institute

Lancaster University

Rothamsted Research

University of Nottingham

Scottish Government

Publisher

Oxford University Press (OUP)

Subject

Plant Science,Physiology

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