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By Barnette D. W.

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Serial ingestion and egestion of plant structural materials mediated by a succession of these animals progressively reduces the average size of the decomposing materials while removing some of the more readily-digested components. Such decomposing plant materials may retain much of their original structure for long periods. As decomposition proceeds and the fragments of organic debris are reduced in size, cell contents are depleted and their walls collapse onto the vacuolar tannins which have resisted previous decomposition.

1 The mineral components - soil texture A useful way of categorising soil inorganic material is by determining its texture which is defined as the proportions by mass of the mineral particles that fall into different size classes, the particle size distribution. Texture is an important characteristic of soil since it influences many aspects of its field behaviour including a number of properties important to the growth of higher plants. These include the amount of water held by the soil and its capacity to retain plant nutrient elements.

Termitaria) origin are frequently present. During the later stages of decomposition of plant materials, less resistant materials are lost leaving only cell wall outlines and fragments which, in the terminal stages of decomposition, may appear amorphous under microscopic examination. Other directly-derived biological materials include such 6 CHAPTER I diverse products as plant root lysates and exudates, the faeces, excreta and secreta of animals, the cutaneous mucus secreted by earthworms and gels produced by micro-organisms.

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