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Vegetation is understandably an integral component of the cover systems used on most tailings and waste rock disposal facilities. The soil in these covers is usually placed and spread using earthmoving equipment such as trucks, scrapers, dozers and front-end loaders. Trafficking of this equipment can easily result in a high degree of compaction of the cover soil, which may compromise the ability of roots to develop laterals or penetrate to adequate depth. Poor root development may curtail the vegetation survival and growth, and thus reduce the effectiveness of the cover system. Soil was collected from the stockpile of a candidate cover soil at a tailings storage site in Western Australia. The soil was compacted according to the relevant Australian Standard in 50 cm long, 10 cm diameter PVC growth columns. Three compaction configurations were used, namely high, low and stratified, in a replicated root penetration experiment. Pre-germinated seeds of Acacia celastrifolia were planted into each column and grown in a temperature regulated glasshouse facility. At 40 days and 60 days after detection of first growth, soil was extruded from the cylinders and the root architecture defined using a WinRHIZO scanner and software. The paper illustrates that the (limited) available literature on the effect of compaction density on root development is simplistic and can be unnecessarily restrictive if adhered to blindly. The importance of working within a framework that contextualizes the degree of compaction, such as is used in engineering earthworks, is shown to be a key factor in interpreting the results of this type of study.

Quantifying the Effect of Substrate Compaction on Root Development in Cover Systems