Kechavarzi Cedric, Pettersson Karin, Leeds-Harrison Peter, Ritchie Laurie, Ledin Stig
National Soil Resources Institute, Cranfield University at Silsoe, MK454DT, Silsoe, UK.
Environ Pollut. 2007 Jan;145(1):68-74. doi: 10.1016/j.envpol.2006.03.039. Epub 2006 Jun 2.
The efficiency of rhizosphere biodegradation of petroleum hydrocarbons heterogeneously distributed in soils is dependent on the ability of plant roots to prospect into contaminated zones. Rhizobox experiments were conducted to study the influence of diesel contaminated layers on the spatial distribution and the development of the roots of perennial ryegrass. Root distribution and root and shoot development were monitored over time. The final root and above ground biomass and the final TPH concentration were determined. The spatial distribution of the contaminant as well as the irrigation method used affected root distribution, plant development and TPH degradation and therefore ryegrass remediation potential. The results show that roots colonise fully uncontaminated soil and grow preferentially between zones of contamination. Conversely, when no immediate uncontaminated soil is available, roots grow through contaminated zones in order to prospect for uncontaminated soil.
土壤中不均匀分布的石油烃在根际的生物降解效率取决于植物根系深入污染区域的能力。进行了根箱实验，以研究柴油污染层对多年生黑麦草根系空间分布和生长发育的影响。随着时间的推移监测根系分布以及根和地上部分的生长发育情况。测定了最终的根和地上生物量以及最终的总石油烃浓度。污染物的空间分布以及所采用的灌溉方法影响了根系分布、植物生长发育和总石油烃降解，进而影响黑麦草的修复潜力。结果表明，根系定殖于完全未受污染的土壤中，并优先在污染区域之间生长。相反，当没有直接的未受污染土壤时，根系会穿过污染区域以寻找未受污染的土壤。
