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Reorganisation of rhizosphere soil pore structure by wild plant species in compacted soils.
Journal of Experimental Botany ( IF 6.9 ) Pub Date : 2020-07-15 , DOI: 10.1093/jxb/eraa323
Jasmine E Burr-Hersey 1, 2 , Karl Ritz 1 , Glyn A Bengough 2, 3 , Sacha J Mooney 1
Affiliation  

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.


中文翻译:

压实土壤中野生植物对根际土壤孔隙结构的重组。

摘要
土壤压实是植物生长的主要障碍,但在非农业环境中,经常观察到野生植物在高堆积密度的土壤中蓬勃发展。我们分析了三种通常在自然环境中的致密土壤中生长的非栽培物种的根系生长。在压实至1.8 g cm –3的沙壤土中,将核仁大蕉(Plantago lanceolata),蒲公英(Taraxacum officinale)和长矛蓟(Cirsium v​​ulgare)的植物生长28 d,其耐穿透性为1.55 MPa。X射线计算机断层扫描用于现场观察牙根结构并可视化播种后14 d和28 d的根际孔隙度变化(分辨率为35μm)。在距根表面最多420μm的四个增量区域内分析了土壤的孔隙度。在所有物种中,根际的孔隙度最大,最接近根部,而随着距根部表面距离的增加而减小。这三个物种的根际孔隙度存在显着差异,Cirsium植物在所有根际区域都表现出最大的结构成因。孔隙空间的产生表明植物可以通过根际中的局部结构重组来自我修复压实的土壤,这对植物和土壤都有潜在的功能意义。
更新日期:2020-10-08
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