期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 71, 期 19, 页码 6107-6115出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eraa323
关键词
Cirsium vulgare; dandelion; Plantago lanceoloata; porosity; ribwort plantain; roots; soil compaction; spear thistle; Taraxacum officianale; X-ray computed tomography
资金
- NERC
- BBSRC-funded STARS (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 [NE/M009106/1]
- Scottish Government
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 mu m) at 14 d and 28 d after sowing. Porosity of the soil was analysed within four incremental zones up to 420 mu m 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.
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