Do geotextiles affect soil biological activity in the ‘reburial’ environment?

Abstract

The effect of five different proprietary geotextiles on the activity of soil micro-organisms (respiration as measured by CO2 production) has been investigated in model laboratory chambers. The aim was to determine whether geotextiles, used to ‘protect’ archaeological materials during conservation by reburial, influence microbial processes that may promote biodegradation of organic archaeological materials by altering the physical properties of the soil. Four of the geotextiles were composed of either polythene or polypropylene and did not provide substrates for microorganisms. These four geotextiles had no significant effect on microbial activity over a short-term (56 days) burial period. By contrast, one of the geotextiles had a core of wheat straw and coconut fibre bonded in a polypropylene mesh. This geotextile led to increased microbial activity as a result of biodegradation of the straw and fibre core. From a practical point of view, these data suggest that geotextiles that are not themselves readily biodegradable did not enhance biodegradation of other organic material in the short term in the burial environment. If the use of geotextiles offers other advantages, such as providing a marker in the soil or back-fill, or because they facilitate subsequent cleaning and preservation operations, then their use is warranted.

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