By Rob Jenkins, C.K. Jain
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Extra resources for Advances in soil-borne plant diseases
Thus, land management has a dramatic effect on soil macrofauna communities. Primary forests have rather diverse and abundant fauna with density and biomass two to three times higher than that•in managed systems. Epigeic and litter fauna is well represented and the biological activity is mainly concentrated in the top 20 cm of soil. Cropping results in a dramatic decrease in taxonomic richness, density and biomass. Termites are the major component. Earthworms are mainly represented by endogeic species and their distribution in the soil profile is relatively deep (20-30 cm).
Advances in Soil-borne Plant Diseases 30 BIOLOGICAL EFFECTS In a natural soil, a complex and dynamic balance exists between the different groups of organisms with different feeding habits. Predation and competition are the main factors controlling this equilibrium. Predation has an important role because it establishes a baJance between the number of individuals and the quantity of available resqurces. Competition is another way to maintain soil fauna populations in balance with soil resources.
Other macrofauna groups such as termites tend to be more persistent. Soils under pasture are more favourable for earthworm development as there is an improvement in leaflitter quality, a great quantity of manure brought to the soil, and a more limited physical soil perturbation unless seriously overgrazed. Other soil management practices, such as palm tree plantations with herbaceous legume cover or cocoa with a layer at the soil surface and high trees, usually have diverse soil biotic communities.
Advances in soil-borne plant diseases by Rob Jenkins, C.K. Jain