Book reviews : Trudgill,S.T. 1988: Soil and vegetation systems,Second edition. Oxford: Clarendon Press. x + 211 pp. £25.00 cloth,£8.95 paper

Bal, L. 1982: Zoological ripening of soils. Centre for Agricultural Publishing and Documentation: Wageningen .

Bilby, R.E. 1981: Role of organic debris dams in regulating the export of dissolved and particulate matter from a forested watershed. Ecology 62, 1234-43.

Bohm, W. 1979: Methods of studying root systems. Ecological Studies 33, Springer-Verlag : Berlin.

Hole, F.D. 1981: Effects of animals on soil. Geoderma 25, 75-112.

Lee, K.E. 1985: Earthworms, their ecology and relationships with soils and land use. Academic Press: Sydney .

Lee, K.E. and Wood, T.G. 1971: Termites and soils. Academic Press : London.

Lohm, U. and Persson, T. , editors, 1977: Soil organisms as components of ecosystems. Ecological Bulletin 25, Swedish National Science Research Council: Stockholm.

Mitchell, P.B. 1988: The influence of vegetation, animals and micro-organisms on soil processes. In Viles, H.A , editor, Biogeomorphology, Basil Blackwell: Oxford, 43-82.

Smith, O.L. 1982: Soil microbiology: a model of decomposition and nutrient cycling. CRC Press: Boca Raton, Florida.

Zlotin, R.I. and Khodashova, K.S. 1980: The role of animals in biological cycling of forest-steppe ecosystems. Translation by Lewus, W. and Grant, W.E . Dowden, Hutchinson and Ross: Stroudsberg, P.A.

Van Zon, H.J.M. 1980: The transport of leaves and sediment over a forest floor . Catena 7, 97-110.